SiUS39 - 501
R410A Heat Pump 60HzRXYMQ-M Series
R410A Heat Pump60Hz
Part 1 General Information........................................................... 1
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Part 3 List of Electrical and Functional Parts ........................... 17 & ' ( )
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Part 4 Refrigerant Circuit ........................................................... 23 + , -
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Part 9 Precautions for New Refrigerant (R410A) .................... 193 ( 7+ ,=+-3!> *-
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Index ............................................................................................ i
Drawings & Flow Charts .................................................................v
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Refrigerant Circuit 23
Part 4Refrigerant Circuit
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Low pressure
High pressure
Filter
Capillarytube
sensor
sensorS
P
Stop valve (With service port on field piping side φ6.4mm flare connection)
SP
Filter
SV
Oil
sepa
rato
r
Four way
Solenoid
valve
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Pressureregulating valve
valve
Solenoid Fusibleplugvalve
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Filter
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Check
valve
valve
HPS
Rec
eive
r
switchHigh pressure
Check
Check
valve
valve
expansion valveElectronic
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expansion valveElectronic
heat exchangerDouble pipe
Filter
Heat exchanger
Service port
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Solenoid valve
(Connector color : PINK)
Y2S
S1NPHHigh pressure sensor lead wire
(Connector color : RED)(Low voltage)
S1NPLLow pressure sensor lead wire
(Connector color : BLUE)(Low voltage)
(Connector color : BLUE)(High voltage)
(Connector color : PINK)(High voltage)
Y3S
Y2S
Four way valve lead wire
Y1E Electronic expansion valve
Y2E Electronic expansion valve
Solenoid valve lead wire
(Connector color : WHITE)(High voltage)
Y1S Solenoid valve lead wire
(Connector color : WHITE)
Y1S Solenoid valve
(Connector color : GRAY)(High voltage)
E1HC Crankcase heater lead wire
Four way valve coilY3S
Discharge pipe thermistorlead wire
R3T
S1NPHHigh pressure sensor
(Connector color : RED)
S1NPLLow pressure sensor
(Connector color : BLUE)
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Function 27
Part 5Part 5Part 5Part 5Function
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( $Operation instop mode
Pressureequalization
prior to startup
Startup control• Cooling startupcontrol
• Heating startupcontrol
Oil return INconditions are met.
Operation mode change
Oil return operation
Pump-downresidual
operation
Restart standby(Compressor stop)
Yes
Yes
No
No
Malfunction/Standby
Indoor unit stop orthermostat OFF
Normal operation• Compressor PI control• Electronic expansion valve PI control
• Protection control
Indoor unit thermostat ON
Defrost INconditions are met.
No
YesDefrosting operation
Cooling or heatingoperation
Indoor unit thermostat ON
Indoor unit stop orthermostat OFF
Indoor unit stop orthermostat OFF
Malfunction/Standby
Malfunction/Standby
Note:In the event indoor unit stops or the thermostatturns OFF while in oil return operation ordefrosting operation, pump-down residualoperation is performed on completion of the oilreturn operation or defrosting operation.
Malfunction/Standby
(V3152)
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STEP8
STEP7
STEP6
STEP5
STEP4
STEP3
STEP2
STEP1
Pc>450 psi
Pc<261 psi Pc>348 psi
Pc<261 psi Pc>348 psi
Pc<261 psi Pc>348 psi
Pc<261 psi Pc>348 psi
Pc<261 psi Pc>348 psi
Pc<261 psi Pc>334 psi
Pc<261 psi Pc>305 psi
STEP0
Pc<261 psi Pc>276 psi
850 rpm
715 rpm
580 rpm
445 rpm
360 rpm
285 rpm
400 rpm
250 rpm
0 rpm
M1F
815 rpm
680 rpm
545 rpm
410 rpm
325 rpm
250 rpm
0 rpm
0 rpm
0 rpm
M2F
STEP3
STEP4
STEP5
STEP6
STEP7
STEP8
STEP2
STEP1
STEP0
Cooling
Fan Steps
850 rpm
250rpm
815rpm
M1F
0 rpm
M2F
STEP8
STEP1
Heating
There are 2 steps in heating operation.
Reference
Pc: HP pressure sensor detection value
(V3172)
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Special Control SiUS39-501
3.7 Pressure Equalization Prior to StartupBefore activating the compressor, the activation load is lightened by equalization across the compressor. In addition, inverters turn on electricity and capacitors are charged.
Actuator Operation Remarks
Compressor OFF
Outdoor unit fanCooling:OFFHeating:Ta>78.8°F; STEP8, Ta≤78.8°F; OFF
Four way valve Keep former condition.
Main electronic expansion valve (EV1) 0 pls
Subcooling electronic expansion valve (EV2) 0 pls
Hot gas bypass valve (SVP) ON
Receiver gas discharging valve (SVG) OFF
Ending conditions • • 3 min.• • Pc-Pe<29 psi or
40 Function
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Pc>500 psiEvery 10 sec.
Pc>493 psi
Pc<479 psi
Pc>3.6MPa
Keeping the current step
Every 60 sec. 479 psi≤Pc≤493 psi Every 5 min.
or
&
High pressure not limited
High pressure limited
INV upper limit frequency:1-step up from current compressor frequency
INV upper limit frequency:1-step up from current compressor frequency
Pc: HP pressure sensor detection value
INV upper limit frequency : 1-step down from current compressor frequency
When occurring 3 times within 30 minutes, HPS is activated without high pressure standby, thus outputting the malfunction code "E3".
High pressurestandby
(V3173)
• INV upper limit frequency • Pc ≤ 493 psi
• During oil return operation• After oil return operation• Stopping operation• Heating operation
Pc>479 psi
Pc>522 psi
52Hz
Pc<450 psi
High pressure not limited
High pressure limited
High-pressure drop
Pc: HP pressure sensor detection value
When HPS is activated, the malfunction code "E3" is output.
High pressurestandby
(V3174)
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52Hz
Pe>58 psi
Pe<10 psi
Low pressure not limited
Low pressurestandby
Low pressurelimited
Pe: LP pressure sensor detection value
When occurring 3 times within 60 min.,the malfunction code "E4" is output.
(V3175)
Pe<10 psi
Upper limit: 124Hz
Upper limit: 52Hz
Upper limit: 1-step up from current compressor frequency
(V3176)
&• Pe>36 psi• INV upper limit frequency
& More than 124HzPe<23 psi
SVP = OFF SVP = ON
Low pressure not limited
Low pressurestandby
Low pressure limited
Pe>28 psi (every 20 sec.)
Pe>25 psi
Pe<19 psi
Pe<19 psi
Pe<23 psi
Pe<15 psi
Pe>28 psi
When occurring 3 times within 60 min.,the malfunction code "E4" is output.
Pe: LP pressure sensor detection value
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Discharge pipetemp.control standby
HTdi>275˚FHTdi>239˚F for 10 min. or more.
or
When occurring 3 times within 100 min., the malfunction code "F3" is output.
(V3177)
• HTdi<203˚F
or
• Defrost operation (preparation ~ post operation)• Oil return operation in heating (preparation ~ post operation)• Oil return operation in cooling (without preparation and post operation)
• Tp<212˚F
or
30 sec.
• Not during defrost operation (preparation ~ post operation)• Not during oil return operation in heating (preparation ~ post operation)• Not during oil return operation in cooling (without preparation and post opeation)
• Tp>266˚F• HTdi>221˚F
In discharge pipe protection control
&&
• Tp>266˚F• HTdi>230˚F
or
• HTdi>239˚F for 90sec. or more• Tp>284˚F
• HTdi>266˚For
Cooling: 20 sec.Heating: 60 sec. • Tp<239˚F
• HTdi<212˚F&
Discharge pipe protection control not limited
Keep the current step
INV frequency 1-step down from current compressor frequency(lower limit: 52Hz)
INV upper limit frequency:1-step up from current compressor frequency
Exclusion of the right conditions
Fix INV frequency 52Hz
HTdi :Value of INV compressor discharge pipetemperature (Tdi) compensated withoutdoor air temperature
Tp : Value of compressor port temperaturecalculated by Tc and Te, and suction superheated degree.
' -#
%
* %" """
"" , E E "
>* * %?
>* & %?
Not limited
Inverter current >23.8A
Inverter current
Inverter current ≥ 24.9A
>23.8A
•Inverter current ≤ 23.8A•INV upper limit frequency
&
•10 sec.•Matching of frequency&
• When occurring 3 times within 60 min.,the malfunction code "L8 " is output.
• When occurring 3 times within 30 min.,the malfunction code "L9" is output
Limited INV upper limit frequency: 1-step down from current
compressor frequency
INV upper limit frequency: 1-step up from current compressor frequency
Inverter current standby
Inverter current ≤ 23.8A continues for 3 min.
Status quo
Without conditions
(V3178)
Not limited
Tfin≥199.4˚F
Tfin≥199.4˚F
Tfin≥210˚F
Fin temp. standby
•Tfin<194˚F•INV upper limit frequency&
• When occurring 3 times within 60 min.,the malfunction code "L4" is output.
Limited INV upper limit frequency: 1-step down from current
compressor frequency
•10 sec.•Macthing of frequency
&
Tfin≤194˚Fcontinues for 3 min.
INV upper limit frequency: 1-step up from current compressor frequency
Status quo
Without conditions
(V3179)
-- '
(@ %
(@ %
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(% %) +
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P0
P1
P2
P4P3
P0
P1
P2
P4P3
P0 P0
P1P2
P4 P4P2'
P1'P0'
P4' P4''P3'
P2''P1''
P0''
P3''
Existing position
Draft prevention position Standard Setting position
Ceiling soiling prevention position
(Not for Multi flow type)
Draft prevention position
Standard position
Prohibited
ProhibitedDirt prevention position
P0
P0'
P0''
P1' P2'
P2''P1''
P3'
P3'' P4''
P4'
P1 P2 P3 P4 Same as existing position
Separated into 5 positions (P1 - 4)
Separated into 5 positions (P2 - 4)
Range of direction adjustment
Range of direction adjustment
(VL012)
-) '
(% %) +
4 8@ & & %% " <<< < < =< <7 7<< ,<< AB>
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0G&& @@ &74K94 K9)9→0+#2< ")$K'%%K'='→5>+< "%%K'%3K'=5→2>2< "%3K'$-K'=2→!>
' -*
(% %) +
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+< "%%K')K'=→5>
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+< ")K'%#K'=5→2>
2< "%#K'$-K'=2→!>
83 '
(% %) +
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+
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< 7 , , && & & &
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7 , , && & & &
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,
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[ '.'0E&&&
8 '
Test Operation 53
Part 6Test Operation
" 8- ( 8-
" ?<(7 8%
(2& 8)
# ' , 8*# ' ,+ 8*
# ' , %3
## 5 , %$
8(
8(
(%'7<7 ,"< "
@H H 8 , %(
8 , (
Check on refrigerant piping
Check on amount of refrigerant charge
(V3180)
Check the below items.2Power wiring2Control transmission wiring
between units2Earth wire
¡ Is the power supply single-phase 208-230V / 60Hz?¡ Have you finished a ductwork to drain?¡ Have you detach transport fitting?¡ Is the wiring performed as specified?¡ Are the designated wires used?¡ Is the grounding work completed?
Use a 500V megger tester to measure the insulation.2 Do not use a megger tester for other circuits than 200-230V circuit.
¡ Are the setscrews of wiring not loose?¡ Is the electrical component box covered with an insulation cover
completely?
¡ Is pipe size proper? (The design pressure of this product is 580 psi.)
¡ Are pipe insulation materials installed securely?Liquid and gas pipes need to be insulated. (Otherwise causes water leak.)
¡ Are respective stop valves on liquid and gas line securely open?
¡ Is refrigerant charged up to the specified amount?If insufficient, charge the refrigerant from the service port of stop valve on the liquid side with outdoor unit in stop mode after turning power on.
¡ Has the amount of refrigerant charge been recorded on “Record Chart of Additional Refrigerant Charge Amount”?
Turn outdoor unit power on.
Carry out field setting on outdoor PC board
Turn indoor unit power on.
(V3056)
¡ Be sure to turn the power on 6 hours before starting operation to protect compressors.
¡ Close outside panels of the outdoor unit.
54 Test Operation
8(
@H( [5 ,<D" E" < G, ,
[<D" "
=?<<<D" EP#P7 ">
" " E&5 ( "<7 ,
;#(C"
;(;#(C!" → <D<
"
"C
Check on operation
(V3057)
Press and hold the TEST button (BS4) on outdoor unit PC board for 5 seconds.
¡ The test operation is started automatically.The following judgements are conducted within 15 minutes(about 30 minutes at the maximum).2“Check for wrong wiring” 2“Check stop valve for not open” 2“Pipe length automatic judgement”
The following indications are conducted while in test operation.2LED lamp on outdoor unit PC board H2P flickers (test operation)2Remote controller Indicates “Under Centralized Control” on
upper right.Indicates “Test Operation” on lower left
(For normal completion)(For abnormal completion)
11
H1PH2PH3PH4PH5PH6PH7P18
88
11
11
11
11
, +
#
<< <
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< , <, , <9 9 ,<,
<" " ,,<E< , ,<
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, E<< ""9
,
# <<D" " (<<D"
- <"7 "" < <"7<
!"""
<D<" <
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Test Operation 55
8(
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< ,< <>
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< E<D<<" E<
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<
'
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<
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<
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7<,<<D
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;< 66 7 ,
< 66 7 ,<''=
5> <(=!(> <
56 Test Operation
8(
( @, 8 ( @8 (, 9 8&
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= 6E>
@8 (, @8&-B"<+=28>< (" "
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"7
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,"
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,"
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,"
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Test Operation 57
( : !
( : !
( -
BS1
MODE SET RETURN TEST RESET
BS2 BS3 BS4 BS5
H1P H2P H3P H4P H5P H6P H7P
1 2 3 4 1 2 3 4
A B C F1 F2 F1 F2Switch cool/heat
Indoor −Outdoor
Outdoor −Outdoor
(2) Set mode display (LED)
(3) Mode setting switch
(1) Microcomputer normal monitor
(4) Local setting switch
Connection terminal for transmission use
DS1 DS2
HAP
(V3171)
(1) Microcomputer normal monitor (LED Green)This monitor blinks while in normal operation, and turns on or off when a malfunction occurs.
(2) Set mode display (LED Orange)LEDs display mode according to the setting.
(3) Mode setting switchUsed to change mode.
(4) Local setting switchUsed to make local settings.
58 Test Operation
9%
9%
9% && %% <,<!<
" " ED< , 7 <<
7 , "
?, ,
=?<" < E ,<
9 <,+ <" <D>
& %% I:AJ" < E< ,<
<,+< <"
?< <E"<A B E<
'&55
< 57 <<A B=>
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>E"<<A B=><5+=<
" 7< ,,">
- (<<A B""=>'+5
8 (<<A B7=><55
$ (<<A B=><" ,
% (<<A B=><+!&5
= ">
,," ,< '&+!!E
;!4/E5A3B'+5A3EB55A3B
TEST
SETTIING
Unit NO.
UNIT NO.
SECONDCODE NO.
MODE NO.
FIELDSETMODE
FIRSTCODE NO.
2P068938
1 76
3 4
5 2
Test Operation 59
9%
%& %% :A7
: 7
:A.77
:A.7
?< <E"<< -E"
<<A B
< AB7 <<
# (< ,< E<
- (< ,< E<
8 (<< <D< ,
$ (<< <
= ">
?< ,< , A' 5 6; ,<B ," ,E<
A3BE ,A3B ," A3B
60 Test Operation
9%
&%& %% :0A
DISPLAY “ ” (CHANGEOVER UNDER CONTROL)
DISPLAY “ ” (VENTILATION/AIR
3P146204
REMOTE CONTROLLER: NAME AND FUNCTION OF EACH SWITCH AND DISPLAY
ON/OFF BUTTON
Press the button and the system will start. Press the button again and the system will stop.
OPERATION LAMP (RED)
The lamp lights up during operation. Blinks in case of stop due to malfunction.
It is impossible to changeover heating/cooling with the remote controller when it shows this display. (As for details, see “SETTING OF MASTER REMOTE CONTROLLER” in the installation manual attached to the indoor unit.)
DISPLAY “ ” (UNDER CENTRALIZED CONTROL)
When this display shows, the system is UNDER CENTRALIZED CONTROL.(This is not a standard specification)
This display shows that the total heat exchanger and the air cleaning unit are in operation. (These are optional accessories).
DISPLAY “ ” (SET TEMPERATURE)
This display shows the set temperature. Only given during a cooling or heating operation.
DISPLAY “ ” “ ” “ ” “ ” “ ”(OPERATION MODE)
This display shows current OPERATION MODE. “ ” is not available with outdoor units specially designed for cooling only. “ ” is reserved only for outdoor units capable of heat recovery.
DISPLAY “ ” (DEFROST / HOT START)
Indicates that defrost or hot start (during which the fan is stopped till the temperature of air supply rises enough at the start of a heating operation) is in progress.
TEMPERATURE SETTING BUTTON
Use this button for SETTING TEMPERATURE of the thermostat. ; Each press raises the set temperature by 1°F. ; Each press lowers the set temperature by 1°F.The variable temperature range is between 60°F and 90°F.
FAN SPEED CONTROL BUTTON
Press this button to select the fan speed, HIGH or LOW, of your choice.
OPERATION MODE SELECTOR BUTTON
Press this button to select OPERATION MODE.
DISPLAY “ ” (MALFUNCTION)
Indicates malfunction and blinks if the unit stops operating due to malfunction.(As for details, see “TROUBLE SHOOTING” in the operation manual attached to the outdoor unit.)
DISPLAY “ ” (FAN SPEED)
This display shows the fan speed: HIGH or LOW.
For the sake of explanation, all indications are shown in the figure above contrary to actual running situations.
63
135
1012
11
98
47
12
F
H L
F
BRC2A71
H L
Test Operation 61
9%
"K559%"
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"<E< ,<,<7
<D " < < "<
< "<7 E
< ,<,<D
# D
- 5D ,<<< < , "
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8 A))B " < ,7< ,<
>
'+5
5 " ,55>#
3 3 3# 3-
3=3>
3
' 6;& ,<= , " >= " <7<< < >
6&,6& "
& ,<
!"" 3E333<
;
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H H&,6& "
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"!"" 33<
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6&,6& '
H H
< + H H
#5 " ! ' =7< , ">
5 "55 "
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=>
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<
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62 Test Operation
9%
0%-%9%
,7 <
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, 6 "
,"
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3 ' ,
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+<
=>
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! 7 H H
#! 7 G=577" >
H H H
-! 7 G,
H H
8' "
H H H
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, ,""
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'.;0 '.!0 '.&0 '.0
3=3>
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, , H H H H
+<
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H H H
! 7 H H H H
#! 7 G=577" >
H H H H
-! 7 G,
H H H H
8' "
H H H H
Test Operation 63
9%
4 ;%./%$
9%
7 < ,< , E, <7
8&
9@* @8@ &(99
2 ,A'"EB7 <<"<"7<<
< ,< ''
∗ < ,A""7<< ''EB<
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7 ,E<" , < P 7''?<P
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8-%
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'< 7 < ,< = ,>E< 7
<" 7<<"7"" "7
< "7"" , ;7E<
7 << ,E< "7 <
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,
7 <
,(
& ,< , < ,=<>
, &,&
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3 33< E833< 3E333<
3 33< E83< 8E333<
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64 Test Operation
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0 9%,; 0L&
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3
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Test Operation 65
9%
A %C %M "
:8 , : ''
E,"<,"
F" , :
< " "<-7< <E
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# (<< " "<," "
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<633E63E68E633-68E< ''<7
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66 Test Operation
9%
:A8
: 8
:A.8
F" ,7 :
?< <E"< -E" <
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A33B7 <
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8 (< <
M "
./&%
?< ,<"7""E< "" 7< P))P
" , 7 " < 9
"< "
Central remote controllerUnified ON/OFF controller
Indoor unit
No remote controllerRemote controller centralized control(automatic address)
1-00 1-01
1-03 1-04
1-02
P1·P2P1·P2P1·P2
Group No. forcentralizedcontrol
1-00 1-01
1-03 1-04
1-02
P1·P2 P1·P2 P1·P2 P1·P2
(V3170)
Test Operation 67
9%
7 ( %$ && %%
)!%+<" " 7 < " ,
< <" '<E" <
'' 7 << =+
<7>
: " = "7< :
>
%$7 , <7 , " 7 <
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7<7
=>
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:
7<7E
,
7<7<
" "
7<7 , 7
" 7< ",
68 Test Operation
9%
<,%
( $
?<<" 7 " ,E ,
" ," <" ,
< ,<,<7
5A " " B ,
" " <
∗' ,
ON by remote controller(Unified ON by central remote controller)
OFF by remote controller(Unified OFF by central remote controller)
Temperature control by remote controller
Operation mode setting by remote controller
OFF by remote controller
Control mode is "1."
Example
↓Rejection
↓Rejection
↓Rejection
↓Acceptance
↓Acceptance (VL069)
"
''"
"
,
" E " E"
''E "E "
'' "
+G = ">
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+G = ">
+G !" 3
+G 3
!"= ">
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= ">
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''"
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+G !"
+G
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:
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+G $
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+G *
Test Operation 69
9%
9% &( -,@
<7 , , "7 <(
-@-,@
<7 , ,"<7 <(
=' ,>
5 "7 < , 5 "
,
56 ;
<, ,
<<, ,9 ""7 < ''='>
56J56-
5<,< ,
''='>
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?<<,< (2=!(>""(2E"<7 ,
,
<""(2 <(2< " 7 ,
?< <,<""(2ED<<, , ,<
7 ,
;,@;%
1 2 3 4 1 2 3 4DS1 DS2
ONOFF
ONOFF
ON
OFF
OFF
ON
RXYMQ36MVJU RXYMQ48MVJU
OFF OFF
OFFOFF
DS No.
DS1-1
Item Contents
Not used Do not change the factory settings.
The following setting is performed according to capability of the outdoor unit.
Cool/Heat change over setting
The Cool/Heat change over setting is carried out by COOL/HEAT changeover remote controller fitted to outdoor unit.
The Cool/Heat change over setting is not carried out by COOL/HEAT changeover remote controller fitted to outdoor unit.
Cooling only
Heat-pumpDS1-2
Cooling only/Heat-pump setting
ON
ON
OFF
OFF
DS1-3DS1-4
DS2-1
HP setting
(Horse power)
DS2-1
DS2-2
DS2-2
DS2-3
DS2-4
DS2-3
DS2-4
;( ;( ;#( ;-( ;8( ;$( ;%(
&5 " 7 7 8 7 7 7 7
70 Test Operation
9%
<<7 ,< ,
&)<+
=7<>C! ,AB
&)<+
<" ,",E
,<
$ &)<-%H+
<D<", ,
$@
$@
BS1
MODE
BS2
SET
BS3
RETURN
BS4
TEST
BS5
RESET
(V2760)
Setting mode 1 Monitor mode
H1P
Push the BS1(MODE button) one time.
Blinking
MODE MODE
Off
H1P
Setting mode 2
MODE
On
H1P
Push and hold the BS1 (MODE button) for 5 seconds.
Push the BS1(MODE button) one time.
(Normal)
(V2761)
Using the MODE button, the modes can be changed as follows.
Check item selection (Set)
Contents display
Monitor mode
Setting mode 1(Initial condition)
Press BS3 (RETURN button).
Press BS3 (RETURN button).
Setting item selection (Set)
Setting mode 2
(Set): Select mode with BS2 (SET button) in each selection step.
Setting conditionselection (Set)
Setting condition(Contents) display
Press BS3 (RETURN button).
Press BS3 (RETURN button).
Press BS3 (RETURN button). Press BS1
(MODE button).
Press BS1(MODE button).
Press BS1(MODE button).Press BS1 (MODE button) for more than 5 sec.
(V2762)
Test Operation 71
9%
;% &%' '
8C7C''9C2 D
,= " ,> &5 " "
;( ;( ;#( ;-( ;8( ;$( ;%(
7 7 8 7 7 7 7
7 8 8 7 7 7 7
(" ,6 7 9 8 7 7 7 7
a. “Setting mode 1”
“Normally, “Setting mode 1” is set. In case of other status, push MODE button (BS1) one time and set to “Setting mode 1”.
∗ The current state is displayed.
72 Test Operation
9%
, 5 "
8 ;
!7" 7< ""=;">
$ "
!7"
) , ," " ,
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$ ,<6 7 " ,
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% ,<6 7 " ,
, ,< 7 " = ,<6 7 , 9 >
*" " ,
<" 9 E<7 < , , ,7 " ,< 7 "
#3 5 ,<,,"7" 7< "
# ,
7 < "= ""< D" <7,
b. “Setting mode 2”
<Selection of setting items>
<Selection of setting conditions>
Push and hold the MODE button (BS1) for 5 seconds and set to “Setting mode 2”.
Push the SET button (BS2) and set the LED display to a setting item shown in the table on the right. ↓Push the RETURN button (BS3) and decide the item. (The present setting condition is blinked.)
Push the SET button (BS2) and set to the setting condition you want. ↓Push the RETURN button (BS3) and decide the condition.
Push the RETURN button (BS3) and set to the initial status of “Setting mode 2”.
∗ If you become unsure of how to proceed, push the MODE button (BS1) and return to setting mode 1.
(V2764)
Test Operation 73
9%
8C7C''9C2 D
, "
, " ,
5;(
;(
; &7 ;$(
5;%(5
;#(;-(
;8( ∗ '
8 ; 8 7 7 7 8 7 8" 8777778 ∗; 8777787
$" 8 7 7 7 8 8 7
" 8777778 ∗" 8777787
) , 8 7 7 8 7 7 7
; ,< 8777877 8777787 ∗&7 8777778
* , 8 7 7 8 7 7 8
; ,< 8777877 8777787 ∗&7 8777778
35<, , 8 7 7 8 7 8 7
0 D 8777877 8777787 ∗7 8777778
+ , , ,
8 7 8 7 8 7 8+ ,C'' 8777778 ∗+ ,C 8777787
,<6 7 , 8 7 8 7 8 8 7
'' 8777777 ∗& 8777778& 8777787&# 8777788
$ ,<6 7 " ,
8 7 8 8 7 8 7
!3C33 8777778!C33 8777787 ∗!-C33 8777877
% ,<6 7 " ,
8 7 8 8 7 8 8
!$C33 8777778!%C33 8777787!)C33 8777877 ∗
*" " , 8 7 8 8 8 7 8
'' 8777778 ∗ 8777787
#3 5 , 8 7 8 8 8 8 7
$3M 8777778%3M 8777787 ∗)3M 8777877
# , 8 8 7 7 7 7 7
'' 8777778 ∗ 8777787
74 Test Operation
9%
8C7C''9C2 D
&;%D5 E
, &5 "
5 ";( ;( ;#( ;-( ;8( ;$( ;%(
3 4 , 9 7 7 7 7 7 7 7
8 9 7 7 7 8 7 8 &7$ ,
- =<>
9 7 7 8 8 8 7
8 => 8 7 7 8 8 8 8
$ => 8 7 8 7 7 7 7
3 =<> 8 7 8 7 8 7 7
=> 8 7 8 7 8 7 8
=> 8 7 8 7 8 8 7
5 , < 9 7 7 7 8 7 7
9 7 7 7 9 7 7
&, 9 7 7 7 7 7 7
, ; 9 7 7 7 7 8 7
9 7 7 7 7 9 7
& 9 7 7 7 7 7 7
, ; 9 7 7 7 7 7 8
9 7 7 7 7 7 9
& 9 7 7 7 7 7 7
c. Monitor mode
<Selection of setting item>
<Confirmation on setting contents>
To enter the monitor mode, push the MODE button (BS1) when in “Setting mode 1”.
Push the SET button (BS2) and set the LED display to a setting item.
Push the RETURN button (BS3) to display different data of set items.
Push the RETURN button (BS3) and switches to the initial status of “Monitor mode”.
∗ Push the MODE button (BS1) and returns to “Setting mode 1”.
(V2765)
(<<<7 <<&568E"<<++E
<< ,
5< " \<7
7 " ,7C
<8< "
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< 3333= >E7< <
-RW$=3><7E< $
9 797997 16 4 132 8 2
Test Operation 75
9%
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<"<
<"< <7 < ,
%'< % .@( &- & %%
7<<< 6 7 ,
(56A B=>
<7 < ,A BA ,B=>
76 Test Operation
9%
%'< % .@( &-%'<,@& %%
7<<< 6 7 ,
(56AB=>
<7 < ,A BA ,B=>
Test Operation 77
9%
!,"( ;&(
!,"(
2 ,< "<7 "<
"=" >E7" , 6#2
0 @@%, -/ % ),@@
@/ % % +
A 7 5/ ,BA 7 5/B
= ,>
A 7 ,B< (2E<
=&7 " AB<ABEA#B
<AB>
# A" " ,B< (2E<
=ABE7< ,,< ,<E<7
,7 <" >= ,>
: @@%, &%%@)8@/ %
% B +
A ,<6 7 ,B< (2= ,>
=&7 " AB<ABEA#B
<AB>
A ,<6 7 ,B< (2E< =
,>
= < " 7 <<"E< ,
,>
# A ,<6 7 ,B< (2E<
= ,>
= < " 7 <<"E< ,
,>
- A" " ,B< (2E<
= ,>
=ABE7< ,,< ,<E< 7 <
" ,<>
78 Test Operation
9%
& @0
& @:
& @0:
Test Operation 79
9%
;&(
2 ,< "< "<
"=" >E<"7" " "" ,<
"" ,
>;&?
>;&?
<" <"<"
0 @@& -/ % ),@@@
/ % % +
<P 7 5/ ,P7 << (2<
P 7 5/P
= ,>
<P5 ,P< (2E<
=5 ,< E<"7" )3ME%3M
$3M<" >
: @@& )@/ % %
B +
<P ,P< (2
<P ,P <P ,PE<
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=5 ,< " E<"7"
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, "" "7"
5 , !"" $3M
5 ,= ,> !"" %3M
5 ,# !"" )3M
, "" "7"
5 ,= ,> !"" -3M
80 Test Operation
9%
& @0
& @:
& @0:
(V3081)
Power consumption
Rated power consumption
80 % of rated power consumption70 % of rated power consumption60 % of rated power consumption
40 % of rated power consumption
Forced thermostat OFF(Fan operation)
Demand level 1 instructing
Power consumption set by "Demand 1 level setting".
Demand level 2 instructing Demand level 3 instructing
The power consumption during the demand level 1 instructing can be set with the "Demand 1 level setting".("70 % of rated power consumption" has been set at factory.)
(V3082)
The power consumption set with "Demand 1 level setting".
When the "Continuous demand setting" is set to ON ("OFF" has been set at factory.) , the power consumption can be set with the "Demand 1 level setting". ("70 % of rated power consumption" has been set at factory.)
Power consumption
Rated power consumption
80 % of rated power consumption70 % of rated power consumption60 % of rated power consumption40 % of rated power consumption
Forced thermostat OFF(Fan operation)
(V3083)
The power consumption set with "Demand 1 level setting".HDemand level 2 instructing HDemand level 3 instructing
The power consumption can be set with the "Demand 1 level setting". ("70 % of rated power consumption" has been set at factory.)
HDuring continuous demand operation, when the external demand instruction is received repeatedly, the instruction with higher demand level has the precedence.
Power consumption
Rated power consumption
80 % of rated power consumption70 % of rated power consumption60 % of rated power consumption
40 % of rated power consumption
Forced thermostat OFF(Fan operation)
Test Operation 81
9%
;% !,"( ;& %
&)<+
,E"<<2=5> → ,
;( ,<
5 ,< , "EA7 " BAB
"
&)<+
,E"<<<2=5><8→ ,
;( ,<
(<<2=> <<&5 "7 << ,
7
(<<2#=++> E<" , "
→(<<2=> <<&5 "7 << ,
=<77>7
(<<2#=++>7 →+
(<<2=5> →+< ,;(
82 Test Operation
9%
C C''9C2 D
,
,
, , ,
, = ,>
;( ;( ;#( ;-( ;8( ;$( ;%( ;( ;( ;#( ;-( ;8( ;$( ;%( ;( ;( ;#( ;-( ;8( ;$( ;%(
7 5 ,
='>
9
/ 9
,<6 7 ,
''=' ,>
9
9
# 9 9
8 7 ,
9
=' ,>
9
# 9
$ ,<6 7 ,
()C33 9
(3C33=' ,>
9
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9
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9
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9
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9
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9
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9
9
, ,
Test Operation 83
9%
* $?< ,< , E"<" "
2<< < "
>( ?
&7 < "EA+ ,+4 ,B
<" " "=;(
"A(+!B= D>EA(+!BA5++!&]5
+&B "<E<" "<
< , , , =< <<
, >
(A2BA ,B
5&$" ," E"< "
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>( ?
? <$7< < "EA+ ,4 ,B
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"
=;( D <" E< "A
(+!BA5++!&]5+&BE<"< ," >
! ,EA ,B " 4 ,"
<""" ,"
(A2BA ,B
84 Test Operation
9%
@H( " <" E< " 7 <
" ,<D 7 ,E" EG,
" " ,,<
Unit stopping
Press the TEST button for 5 seconds.
10 sec to 10 minutes
LED display (H1P~H7P) (8:ON 9:BLINK 3:OFF)3383333
3933338Pressure equalizingStep 1
20 sec to 2 minutes
10 minutes
To 30 seconds
3933383Cooling start controlStep 2
3933388
3933888
3938333
3983333
Stability waiting operationStep 3
Pump down residual operationStep 7
5 minutes
Standby for restarting
Completion
Step 8
• Stop valve close check • Wrong wiring check• Piping length check3 minutes
3933833
3933838
3933883
Judgement functionStep4~6
CHECK OPERATION FUNCTION
(V3165)
Test Operation 85
9%
86 Test Operation
Part 7Part 7Part 7Part 7TroubleshootingTroubleshootingTroubleshootingTroubleshooting
< ,+ *3 <(2 *3
65 , ? + *
# 65 , ? + *
- " <+@"
" 2 *-
8 + *8
& *%
# (2 33
- < , <+ 3- AA0B C ( 5 3
- AA1B C(25 3#-# AA3B C 5 &=&>3-
-- AA6B C'='>&DE 3$
-8 AA7B C 7 ,'"=!> 3%
-$ AA9B C ,(
" 4=3> 3*
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-- AJ6B C < =+->
; <, #
-8 AJ9B C ,; <,
F( "< =+8>#
-$ AJAB C ; ,<( ##
Troubleshooting 87
-% AJCB C &7( #8
-) AL4B C + ,'
"+ #$
-* AL5B C"! #%
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-# AL9B C" -3
-# ALCB C 7
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8
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+ 88
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--- AUEB 7+
8%
--8 AUFB 8*
--$ AUHB E+ ,!
$3
8 < , <+ $8 AUEB 7+
$
8 AM1B(25 $#8# AM8B 7"
: $-
8- AMAB"" "
: $8
88 AMCB!5" E"" ,$%
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$# 5 "A :B2 D=+"52 D>%#
% < ,=(C< > %-% AUEB 7+
%-
% AM1B(25 %$
88 Troubleshooting
%# AM8B 7"
: %%
%- AMAB"" "
: %)
%8 AMCB!5" E"" ,)3
) <D)
Troubleshooting 89
8 -%@-& %%
8 -%@-& %%
8@".8("'8.8:<7 , ,< <
Normalmode
Inspectionmode
Testoperation
mode
Localsettingmode
Servicemode
Depress button for more than 4 seconds.
Depress button for more than 4 seconds.
Press button once.
Press button once. Or after 30 minutes
After 10 seconds
Press button once.
Press button once.
Indoor unit settings can be made• Filter sign time• Air flow direction• Others
You can confirm following three codes with respect to each pushof the button.• Malfunction codes• Indoor model code• Outdoor model code
Service data can be obtained.• Malfunciton code history• Temperature data of various sectionsService settings can be made.• Forced fan ON• Air flow direction/volume setting
(V0815)
The thermostat is turned on by force when the "trial-operation mode" is started (the remote controller displays "trial-operation").
Normalmode
Inspectionmode
Testoperation
mode
Localsettingmode
Servicemode
Depress button for more than 4 seconds.
Depress button for more than 4 seconds.
Press button once.
Press button once. Or after 30 minutes
After 10 seconds
Press button once.
Press button once.
Indoor unit settings can be made• Filter sign time• Air flow direction• Others
You can confirm following three codes with respect to each pushof the button.• Malfunction codes• Indoor model code• Outdoor model code
Service data can be obtained.• Malfunciton code history• Temperature data of various sectionsService settings can be made.• Forced fan ON• Air flow direction/volume setting
(V0815)
The thermostat is turned on by force when the "trial-operation mode" is started (the remote controller displays "trial-operation").
90 Troubleshooting
8 -%@-& %%
%;- & %%
./% " " E<@" &5 DE
"= "" E
"7<< " >< 7<
D " "
Troubleshooting 91
8 -%@-& %%
%;- %& %%
@
:A8
: 8
:A.8
/ <7 ,
9 "" E<" ,&5< ,<"
<
< 7 ,<" 7=<
"7<" < E<
<" ">
(<(A" B
<9 "< " <A B ,<<
"<7< ,A3B
<
(<(5?<,< " <::=[>
,<
["
3 short beeps :<7 ," 1 short beep :"#- <" "- :: < ::
<<
Continuous beep :
# (<5
<A3B="" , > < <
- "" , ,
(<(5?<,< "" , <
< ,::=[> ,
<"" , <<,<777<<(5?
"
["
Continuous beep :2<""7 , <= >
2 short beeps :"" , <
1 short beep :&7 , <
8 (<5
< ,<A3B=7 , > < <
$ 7 , ,
(<(5?<,< 7 , <
< ,::=[> ,
92 Troubleshooting
8 -%@-& %%
<7 , <<,<777<<(5?
"
Troubleshooting 93
8 -%@-& %%
( @& %% N'8
( :
Inspection/test operation
Example model
FXFQ24
Example of capacity code display
Display
071
Product classification
VRV system
Display
F
Indoor unit system code
System classification
Standard indoor
Type
Wall mounted
Multi flow
Ceiling suspended
Built-in
Floor standing
Concealed ceiling duct
Concealed floor standing type
Display
A
F
H
J
L
P
L
Indoor unit type code
Model
FXAQ
FXFQ
FXHQ
FXSQ
FXLQ
FXMQ
FXNQ
Type
VRV
Display
A 8 A
Outdoor model code
Model
RXYMQ-M
UnitMalfunction codeInspection
Normal display (No display)
0L 0
Malfunction code blinks when a malfunction occurs.
UnitMalfunction codeInspection
Inspection mode
Push the button.
Inspection/test operation
Push the button.
Inspection/test operation
Push the button.
Inspection/test operation
Push the button.
Inspection/test operation
Push the button.
0L 0
Indoor unit model code display
0 7 1F F M
Outdoor unit model code display
– – – A 8 A
Test operation
Test operation mode
Capacity codeIndoor unit system codeIndoor unit type codeProgression code
0 7 1...F...F...M...
(V3181)
94 Troubleshooting
8 -%@-& %%
& %% *$/DA BDA ,B < E7 <" ,<
<
<,. @
*$
*$
(
$@
%@&"
< 7 <<
='7 E-#>
%@")9 %%+
< 7 << ='7 E
>
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=&5AB D>
' E< ",
;@)$ G +
5 "< ,<
! ,E&5AB<, D ,
@ &% &
(<<
Troubleshooting 95
8 -%@-& %%
' " < + " "
40 < "
5 " <
<< <,7 <<
41 5 "
5 " "
< "7 <<
3C< C C& 9 " "#CF" "
!-C 8C $C2 %C])C<,"*C57
43 ' << =?<7<< >
2 ,< 7 << E
<<
=>
44 , <" 7 <
< 7 <<
<"7 <<
< 7 7 <<
45
< 7 <<
< 7 <<
Hystory No: 1 - 91: Latest
Unit 1Malfunction code 2-U4
Malfunction code
40
(VE007)
Temperature ºC
41
Sensor data display
Unit No. Sensor type
1 1
2 7
Address
41
Address display
Unit No. Address type
1 8
1
(VE008)
Unit 1
43
(VE009)
Unit 1 Code
44
Air flow direction P0 - P4
Fan speed 1: Low3: High
1 3
(VE010)
Unit 1 Code
45
Present unit No.
Unit No. after transfer
0 2
(VE011)
96 Troubleshooting
!$%
!$%8C7C''9C2 D
" "
" "
(,
!3 9 9 9 " 3
! 9 9 9 (E(+ 3#
!# 9 9 9 =&> 3-
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3*
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- 9 9 9 < =+>< <,= E E< E >
#
8 9 9 9 < =+#>," "= E E< E >
-
* 9 9 9 < =+> = E E< E >
8
! 9 9 9 < = E E< E >
$
I 8 8 8 < %
<" D9E<7E<D"
Troubleshooting 97
!$%
8C7C''9C2 D
" "
" "
(,
9 9 9 (E(+ )
# 9 9 9 ! < ,<"7 < *
- 9 9 9 ! 7"7 < 3
8 9 9 9 "D
$ 9 9 9 "D H
% 9 9 9 #
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8
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)
I 9 9 9 H
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*
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#3
I$ 9 9 9 < =+->< <,= E E< E >
#
I* 9 9 9 ,< <,," "< =+8>
#
I! 9 9 9 < ,<" ##
I 9 9 9 7" #8
&3 9 9 9 H
&- 9 9 9 , " #$
&8 9 9 9 " #%
&$ 9 9 9 " , ,< H
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&! 9 9 9 "7 H
& 9 9 9 7 (
-
( 9 9 9 6 """ H
(- 9 9 9 , "
-#
(I 9 9 9 ' --
<" D9E<7E<D"
98 Troubleshooting
!$%
8C7C''9C2 D
" "
" "
(,
3 8 7 9 &7"" ,<, "
-8
9 9 9 +"<""< H
9 9 9 (7"" -$
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- 9 9 9 7
-*
8 9 9 9 7
8
8 7 8 7 ' ( , ,
H
% 9 9 9 7 H
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8
* 9 9 9 7 <
8#
! 9 9 9 "" E
88
8 8 8 !" 8$
9 9 9 7
8%
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8*
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$3
9 9 9 7
$
87 9 9 ( $#
) 87 9 9 7" :
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87 9 9 !" E "" , $%
<" D9E<7E<D"
Troubleshooting 99
$%-( :
$%-( :
<Selection of setting item>
<Monitor mode>
<Confirmation of malfunction 1>
To enter the monitor mode, push the MODE button (BS1) when in “Setting mode 1”.
Push the SET button (BS2) and set the LED display to a setting item.
Push the RETURN button (BS3) once to display "First digit" of malfunction code.
<Confirmation of malfunction 2>
Push the SET button (BS2) once to display "Second digit" of malfunction code.
Push the RETURN button (BS3) and switches to the initial status of “Monitor mode”.
∗ Push the MODE button (BS1) and returns to “Setting mode 1”.
Contents of malfunction Malfunction
code
<Confirmation of malfunction 3>
Push the SET button (BS2) once to display "master or slave1 or slave2" and "malfunction location".
Detail description on the right.
(V3167)
HPS activated
Abnormal Pe
Detection of INV compressor lock
Instantaneous over current of DC fan motor
Detection of DC fan motor lock
EV1
EV2
Faulty Ta sensor
Abnormal Td
Faulty Tdi sensor
Faulty Ts sensor
Faulty Tb sensor
Faulty Tsh sensor
Faulty Pc sensor
Faulty Pe sensor
Inverter instantaneous over current
Electronic thermal switch 1
Electronic thermal switch 2
Out-of-step
Speed down after startup
Lightening detection
Stall prevention (Current increasing)
Stall prevention (Faulty startup)
Abnormal wave form in startup
Out-of-step
Inverter transmission error
Imbalance of inverter power supply voltage
Faulty thermistor of inverter box
Faulty thermistor of inverter fin
Incorrect combination of inverter and fan driver
Gas shortage alarm
Insufficient inverter voltage
Inverter open phase (phase T)
Charging error of capacitor in inverter main circuit
Over voltage
Over current/Over voltage (Hard detection)
I/O transmission error
Indoor unit system malfunction in other system or
other unit of own system
Abnormal connection with excessive number of indoor units
Conflict of refrigerant type in indoor units
Incorrect wiring (Auto address error)
Malfunction of multi level converter, abnormality in
conflict check
Abnormal discharge pressure
Abnormal suction pressure
Compressor lock
Over load, over current,
abnormal lock of outdoor unit fan motor
Malfunction of electronic expansion valve
Faulty sensor of outdoor air temperature
Abnormal discharge pipe temperature
Faulty sensor of discharge pipe temperature
Faulty sensor of suction pipe temperature
Faulty sensor of heat exchanger temperature
Faulty sensor of subcool heat exchanger temperature
Faulty sensor of discharge pressure
Faulty sensor of suction pressure
DC output over current
Electronic thermal switch
Stall prevention (Limit time)
Transmission error between inverter and outdoor unit
Open phase / Power supply imbalance
Faulty temperature sensor inside swicth box
Faulty temperature sensor of inverter radiation fin
Incorrect combination of inverter and fan driver
Gas shortage
Abnormal power supply voltage
Abnormal SP-PAM
Abnormal latch circuitry
No implementation of test-run
Transmission error between indoor and outdoor unit
Transmission error of other system
Erroneous on-site setting
Faulty system function
Transmission error in accessory devices, conflict
in wiring and piping, no setting for system
E3
E4
E5
E7
E9
H9
F3
J3
J5
J6
J9
JA
JC
L5
L8
L9
LC
P1
P3
P4
PJ
U0
U2
U3
U4
U9
UA
UH
UF
100 Troubleshooting
$%-( :
8C7C''9C2 D
H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P
Malfunction code 2nd digit display section
Malfunctionlocation
7 77 9
9 7
Master
Slave 1
Slave 2
Malfunction
code
Confirmation of malfunction 1 Confirmation of malfunction 2 Confirmation of malfunction 3
H1P H2P H3P H4P H5P H6P H7P
Malfunction code 1stdigit display section
(V3168)
9999
9
9999999999
9
9999999
999
9
99
999999
9999999999
9
9999999
999
9
99
7777
77
7777777777
7
7
77
777
7
77
7777
77
7777777777
7
7
77
777
7
77
7777
9
9777799979
9
9777977
779
9
99
7999
7
7779977997
7
9779977
797
7
79
9779
7
7997979777
7
7797779
977
9
99
9799
9
9999797797
9
7997977
97977
99
7777
9797777777777
7
7777777
777
7
77
77797
977797777777
7
7777777
777
7
77
E3
E4
E5
E7
E9
H9
F3
J3
J5
J6
J9
JA
JC
L5
L8
L9
LC
P1
P3
P4
PJ
U0
U2
U3
U4
U9
UA
UH
UF
9
999
9
9
9
7
777
7
9
9
7
999
9
7
7
9
779
9
7
7
9
797
9
7
9
Troubleshooting 101
8 -%@-@& %%
8 -%@-@&
%%
“A0” #. ./ % ;*&
%%
;%
A0
0%-%
$%
!
$@
$%
;
5"< 7 "
$%
;
?<" 7 " 7 <<
P '' P
! "
""
5 (
8 -%@
(V2776)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Indoor unit PC board replacement.
Actuation of external protection device.
Change the second code No. to "01" or "02" .
Externalprotection device is
connected to terminals T1and T2 of the indoor
unit terminalblock.
ON/OFFinput from
outside (mode No. 12,first code No. 1) has beenset to external protection
device input (secondcode No. 03)
by remotecontroller.
YES
NO
NO
YES
102 Troubleshooting
8 -%@-@& %%
“A1” #: ;&
%%
;%
A1
0%-%
$%
!
$@
$%
;
<DN(+
$%
;
?< <N(+
N(+C" 7<<"7
""
5 (
8 -%@
Turn power supply OFF, then power ON again.
Doesthe system return
to normal?
YES
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
External factor other than malfunction (for example, noise etc.).
Replace the indoor unit PC board. (V2777)
NO
Troubleshooting 103
8 -%@-@& %%
“A3” #$%; !*% %&)!+
&
%%
;%
A3
0%-%
$%
'.'0E'.0E'.0E'.;0=" >E'.!0=" >
$@
$%
;
27 <''
$%
;
?< 7 <7 <,''
3)J#34"7"" "
57 <<
5 ""
5 ,, ,E"7"E
5 (
&
104 Troubleshooting
8 -%@-@& %%
8 -%@
(V2778)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Replace float switch.
Modify the float switch's connection and turn on again.
Connect the drain pump and turn on again.
Check the drain piping for clogging or upward slope, etc.
Replace indoor unit PC board.
Replace the drain pump or check for dirt, etc.
Connect either a short circuit connector or float switch and turn on again.
YES
YES YES
YES
YES
Defect of indoor unit PC board.
Loose connection of connector.
NO NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
NO
The floatswitch is connected toX8A of the indoor unit
PC board.
NO
The drainpump works when
the power supply is resetfor the indoor
unit.
The drainpump is connected
to X25A or terminals Y1and Y2 of theindoor unit PC
board.
The voltageof terminals Y1
and Y2 or X25A is208~230 V (within
5minutes of resettingthe power supply).
Water builds up in the drain pan.
The floatswitch contact is
forming a short circuit(continuity check
with X8A disconnected)
A shortcircuit connector is
connected toX8A.
Provide 208~230V power supply.
YES
NOIs power supply208~230V provided?
Becomesnormal when X8A of
the indoor unit PC boardis short circuited
The float switchfunctions normally.
Troubleshooting 105
8 -%@-@& %%
“A6” #9$ )$9+!HG(* %&
%%
;%
A6
0%-%
$%
!
$@
$%
;
5 , ,<
$%
;
?<@7<",<
'D
5 7 ,7(
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Connect the wiring and turn on again.
Fix the wiring and turn on again.
YES
NO
NO
NO
YES
YESReplace the indoor unit PC board.
Replace the fan motor.
Is thewiring from the fan
motor securely connectedto connectors on the
indoor unit PCboard?
Wiringbetween the
indoor unit PC board andfan motor is
disconnected.
Does the fan motor run?
(V2779)
106 Troubleshooting
8 -%@-@& %%
“A7” #$%,9%$ )$0+&
%%
;%
A7
0%-%
$%
'.;0
$@
$%
;
:''< 7 <7<<
$%
;
?<''< 7 <" ,<,<<7 ,"
, :" =#3>
57 ,
5 ="7"" 7 <>
5 7 G ,"6
5 (
Troubleshooting 107
8 -%@-@& %%
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Provide 208~230V power supply.
YES
NOIs power supply208~230V provided?
Replace the limit switch connecting cable.
Replace indoor unit PC board.
Replace the power supply connecting cable.
Replace swing motor.
Take the cam mechanism apart, reassemble and turn on again.
YES
NO
YES
YES
NO
YES
NO
Connect the connector to X9A and turn on again.
Replace indoor unit PC board.NO
NO
YES NO
YES
NO
YES
YES
NO
Indoor unitis a model equipped
with a swing flapfunction
The swingmotor works when
the power supply is turnedoff and then back
on.
Whenthe air flow
direction flap's cammechanism is disconnected
from the swing motor,operation is normal
when turnedon again.
The connecting cablehas no continuity.
Afterturning
the swing-flapON and then
stopping with the remote controller, the
voltage of X6A of the indoor unit PC board is 208 ~ 230 VAC
(60 Hz) when turned onagain (within 30
seconds ofturning on
again).
The connectoris connected to X9A of
the indoor unit PCboard.
The limit switchfunctions normally.
The connectingcable is short-circuited
or disconnected.
Replace swing motor.
(V2780)
108 Troubleshooting
8 -%@-@& %%
4 “A9” #$%$* .% ./5%*).+
&
%%
;%
A9
0%-%
$%
!
$@
$%
;
"<D< "
$%
;
?<<" "< " 7< < :
< "
," "
5 (
5 ,
8 -%@
(V2781)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
After connecting, turn the power supply off and then back on.
Replace the moving part of the electronic expansion valve.
YES
YES
NO
NO
Replace the connecting cable.
If you turn the power supply off and turn on again, and it still does not help, replace the indoor unit PC board.
NO
YES
Theelectronic
expansion valve isconnected to X7A of the
indoor unit PCboard.
Normalwhen coil check
(∗1) of the moving part ofthe electronic expansion
valve ischecked.
The connectingcable is short-circuited or
disconnected.
Troubleshooting 109
8 -%@-@& %%
∗C <D<< ,"< "
5 < " <(<D< 7
<"
=>
C !"" #33ΩC !"" 83Ω
L C
( ?< /7 #, -2 8+ $27
?< L!"" #33Ω
L!"" 83Ω
L
/7 L!"" #33Ω
L!"" 83Ω
#, L!"" 83Ω
L
-2 L!"" 83Ω
8+ L
$27
110 Troubleshooting
8 -%@-@& %%
A “AF” #; !*%-*!&
&
%%
;%
AF
0%-%
$%
'.'0E'.0E'.0
$@
$%
;
?D, 7 <''" 7< <"
6"
$%
;
?<<7 <<,''7< <" 6"
; =" >D ,
5 " "="7"E>
5 (
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Defect of indoor unit PC board.
Modify the drain piping.YES
NO
NO
Field drainpiping has a defect such as
upward sloping.
Check if the humidifier unit isleaking.
YESA humidifier
unit (optional accessory)is installed on the
indoor unit.
(V2782)
Troubleshooting 111
8 -%@-@& %%
7 “AJ” #$%; &
;*
&
%% %
AJ
0%-%
$%
!
$@
$%
;
" , <" ,"<
<< (E7<<<
$%
;
" C
?<<" <(@E<" ,
"
?<" <@ <
/<, <" ,"
5 (
8 -%@
(V2783)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Install a capacity setting adaptor.
Replace the indoor unit PC board.NO
NO
YES
YES
Replace the indoor unit PC board.
The indoorunit PC board was replaced
with a replacementPC board.
The indoorunit is a model that
requires installation of acapacity setting adaptor
when replacing thePC board.
112 Troubleshooting
8 -%@-@& %%
“C4” #$%8@ & )8+ <
./@
&
%%
;%
C4
0%-%
$%
!
$@
$%
;
"< <,<
$%
;
?<<< <,< <7< < ,
5< =+> 9 " "
5 (
8 -%@
∗+A< + "< B(*3
(V2784)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Replace the indoor unit PC board.
Connect the thermistor and turn on again.
NO
NO
Replace the thermistor (R2T).
YES
YES
Connectoris connected to X12Aof the indoor unit PC
board.
Resistanceis normal whenmeasured after
disconnecting the thermistor(R2T) from the indoor
unit PC board (3.5kΩ~360kΩ)
Troubleshooting 113
8 -%@-@& %%
“C5” #$%8@ & )8+ M
&
%%
;%
C5
0%-%
$%
!
$@
$%
;
"," "<
$%
;
?<<," "< <7< < ,
5 < =+#>," "
5 (
8 -%@
∗+A< + "< B(*3
(V2785)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Replace the indoor unit PC board.
Connect the thermistor and turn on again.
NO
NO
Replace the thermistor (R3T).
YES
YES
Connector isconnected to X11A of
the indoor unit PCboard.
Resistanceis normal whenmeasured after
disconnecting the thermistor (R3T) from the indoor
unit PC board.(0.6kΩ~360kΩ)
114 Troubleshooting
8 -%@-@& %%
“C9” #$%8@ & )8+
0
&
%%
;%
C9
0%-%
$%
!
$@
$%
;
" "
<
$%
;
?<< "< <7< <
,
5 < =+>
5 (
8 -%@
∗+A< + "< B(*3
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Replace the indoor unit PC board.
Connect the thermistor and turn on again.
NO
NO
Replace the thermistor (R1T).
YES
YES
Connectoris connected to X13A
of the indoor unitPC board.
Resistanceis normal whenmeasured after
disconnecting the thermistor(R1T) from the indoor
unit PC board. (7.2kΩ~112kΩ)
(V2786)
Troubleshooting 115
8 -%@-@& %%
“CA” #$%8@ & ;@
0
&
%%
;%
CA
0%-%
$%
!
$@
$%
;
" <, "
<
$%
;
?<< <, "< <7< <
,
5 <
5 (
8 -%@
∗+A< + "< B(*3
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Replace the indoor unit PC board.
Connect the thermistor and turn on again.
NO
NO
Replace the thermistor.
YES
YES
Connectoris connected to the indoor
unit PC board.
Resistanceis normal whenmeasured after
disconnecting the thermistorfrom the indoor unit
PC board. (7.2kΩ~112kΩ)
(V2786)
116 Troubleshooting
8 -%@-@& %%
“CJ” #$%8@ &
& %%
&
%%
;%
CJ
0%-%
$%
!
$@
$%
;
"
"< =C>
$%
;
?<< "< <7<
< ,
5<
5(
8 -%@
"# < E " <
∗+A< + "< B(*3
Turn power supply OFF, then power ON again.
Is "CJ"displayed on the remote
controller?
YES
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Replace remote controller.
External factor other than equipment malfunction.(for example, noise etc.)
(V2787)
NO
Troubleshooting 117
8 -%@-@& %%
“E1”( #: ;&
%%
;%
E1
0%-%
$%
!
$@
$%
;
<DN(+
$%
;
?< <N(+
N(+C" 7<<"7
""
5 (=!(>
8 -%@
Turn off the power once and turn on again.
Return to normal?YES
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
External factor other than malfunction (for example, noise etc.).
Replace the outdoor unit main PC Board (A1P).
(V3064)
NO
118 Troubleshooting
8 -%@-@& %%
“E3”( #0<@ ,@&
%%
;%
E3
0%-%
$%
!
$@
$%
;
! 7<<<< ,<"" 7 <"
$%
;
,7<<;( <<" <"
! < ,<"7 <
5; ,<"7 <
5 (
"7
'< ,<"
8 -%@
C! < ,<"7 <=;(>
^ < < <, _
^ 5
^ < ,6<,_
^ '< ,<"
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Operationis normal when turned
on again by remotecontroller.
Replace outdoor unit PC board (A1P).
Actuation of high pressure switch. H1
YES
YES
There was an instantaneous power failure or a past safety device actuated.Re-check refrigerant system.
NO
NO
(V3065)
Contact S1PH is open.
Connect the connector and operate again.
NO
YES
Are theHPS connectors
connected to the outdoor mainPC Board (A2P)?
H1
Troubleshooting 119
8 -%@-@& %%
4 “E4”( #0!, ,@&
%%
;%
E4
0%-%
$%
!
$@
$%
;
! "7 <7"
$%
;
,7<<7" """ "
!"7"
57"
5 (
" "
120 Troubleshooting
8 -%@-@& %%
8 -%@
∗C4,"
∗C+A(BE",< (*
(V2791)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is the malfunctiondue to abnormal drop of low
pressure?
Measurethe voltage (VL)
of X45A pin No. (2) - (3)of outdoor PC board (A1P).∗1
Is the relationshipbetween low
voltage and VLnormal?
∗2
Out of gas, refrigerant system clogging, wiring and piping wrong connection, stop valve closed, electronic expantion valve fully close malfunction.
Replace the low pressure sensor.
Replace outdoor unit PC board A1P.
NO
NO
YES
YES
Is stop valve opened? Open stop valve.NO
YES
Troubleshooting 121
8 -%@-@& %%
A “E5”( #& $ !H
&
%%
;%
E5
0%-%
$%
!
$@
$%
;
(D<" ,4? 7<
"E<" ,"
$%
;
<" ,7 <# "9 7<"
"E 7<"D?<<"
,
"D
; ,< "=%#" >
4?7 ,
' (
"
8 -%@
Check the installation conditions.
Is the stop valve open?NO
Is the UVWN wiringnormal?
NO
NO
NO
NO
Is highdifferential pressure
starting? (73 psior more)
YES
YES
YES
Check and seewhether compressor is
short-circuited orground.
YES
YES
Are inverteroutput voltages the same
for 3 phases?
Does low orhigh pressure vary
even instantaneously whenrestarting
compressor?
YES
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Open the stop valve.
Connect correctly.
Remedy the cause.
Replace the compressor.
Replace the inverter PC board (A2P).
Replace the compressor.
(V2793)
NO
122 Troubleshooting
8 -%@-@& %%
7 “E7” ( #$%( 9$ &
%%
;%
E7
0%-%
$%
!
$@
$%
;
,<"<
7<<
$%
;
?<<7 <"<" -87<<
,
?< ,- E<<7
<<7( E
' ,,
, C"8 =>
Troubleshooting 123
8 -%@-@& %%
8 -%@
<DC+()
<DC+()
Check No. 1Check on connector of fan motor (Power supply cable)
Check No. 2 Check for Fan Speed Pulse Input on Outdoor Unit PC Board.
YES
NOReplace the fan motor of outdoor unit.
Replace outdoor unit PC board.
(V3077)
Is the pulse inputted?
Connectorof fan motor isdisconnected.
YES
NO
NO
YES
Can the fanbe turned smoothly
with hand after disconnect the connector of
fan motor?
Is there anyobstacle around
the fan?
YES
NO
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Connect the connector.
Remove the obstacle.
Replace the fan motor of outdoor unit.
124 Troubleshooting
8 -%@-@& %%
“E9”( #$%$* .% ./5%*
&
%%
;%
E9
0%-%
$%
!
$@
$%
;
<D
<D "
$%
;
,"7""7<<"7
5 ," "
5 (=!(>
8 -%@
(V3067)
YES
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Return to normal?
Turn power supply off, and turn power supply on again.
Electronicexpansion valve is
connected to X26A andX28A of outdoor unit
PC board(A1P).
Normalwhen coil
check (∗1) of the movingpart of the electronicexpansion valve is
checked.
Replace outdoor unit PC board (A1P).
NO
NO
NO
Replace the moving part of the electronic expansion valve.
External factor other than malfunction (for example, noise etc.).
After connecting, turn the power off and then back on again.
YES
YES
Troubleshooting 125
8 -%@-@& %%
∗ <D<< ,"< "
5 < " <(<D< 7
<"
=>
C !"" #33ΩC !"" 83Ω
L C
( ?< /7 #, -2 8+ $27
?< L!"" #33Ω
L!"" 83Ω
L
/7 L!"" #33Ω
L!"" 83Ω
#, L!"" 83Ω
L
-2 L!"" 83Ω
8+ L
$27
126 Troubleshooting
8 -%@-@& %%
“F3”( #0- &%;@
8&
&
%%
;%
F3
0%-%
$%
!
$@
$%
;
! ,<"< <," "
"
$%
;
?<< <," "" < ,<
?<< <," ""
' <," ""
' <," "<
' (
8 -%@
∗+A< + "< B(*3
(V3182)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Discharge pipetemperature is 239˚F
or higher.
Arethe characteristics
of the discharge pipethermistor normal?
(3.5~400KΩ)
Replace outdoor unit PC board (A1P).
Replace the discharge pipe thermistor.
NO
NO
Out of gas, compression defect, etc. Defect of the refrigerant system.
YES
YES
Troubleshooting 127
8 -%@-@& %%
“H9”( #$%8@ & )8+
( 0
&
%%
;%
H9
0%-%
$%
!
$@
$%
;
<
$%
;
?<< "<< "
5< =+>
5 (=!(>
8 -%@
< "7<< ,
∗+A< + "< B(*3
(V3070)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Resistanceis normal whenmeasured after
disconnecting the thermistor(R1T) from the outdoor
unit PC board.(3.5kΩ~360kΩ)
Connector is connected to outdoor
PC board(A1P).
Replace outdoor unit PC board (A1P).
Connect the thermistor and turn on again.
NO
NO
Replace the thermistor (R1T).
YES
YES
128 Troubleshooting
8 -%@-@& %%
“J3”( #$%;@ 8@ & )8+
&
%%
;%
J3
0%-%
$%
!
$@
$%
;
<" <," ""
<
$%
;
?<< " < <," ""<
5< =+#> <," "
5 (=!(>
8 -%@
∗+A< + "< B(*3
(V3072)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Resistanceis normal whenmeasured after
disconnecting the thermistorR3T from the outdoor
unit PC board.(3.5kΩ~400kΩ)
Replace outdoor unit PC board (A1P).
Connect the thermistor and turn on again.
NO
NO
Replace the thermistor (R3T).
YES
YES
Connectoris connected to
outdoor unit PC board
(A1P).
Troubleshooting 129
8 -%@-@& %%
“J5” ( #$%8@ & )8+
&
%%
;%
J5
0%-%
$%
!
$@
$%
;
<"< " ""
<
$%
;
?<< " < " ""<
5< =+> " "
5 (=!(>
8 -%@
∗+A< + "< B(*3
(V3073)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Resistanceis normal whenmeasured after
disconnecting the thermistor(R2T) from the outdoor
unit PC board. (3.5kΩ ~360kΩ)
Replace outdoor unit PC board (A1P).
Connect the thermistor and turn on again.
NO
NO
Replace the thermistor R2T.
YES
YES
Connectoris connected to outdoor
unit PC board.(A1P)
130 Troubleshooting
8 -%@-@& %%
“J6”( #$%8@ & ) 8+
( <./@
&
%%
;%
J6
0%-%
$%
!
$@
$%
;
<"<< <,<
$%
;
?<< " << <,<
5< =+-> < <,
5 (=!(>
8 -%@
∗+A< + "< B(*3
(V3074)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Resistanceis normal whenmeasured after
disconnecting the thermistorR4T from the outdoor
unit PC board. (3.5kΩ~360kΩ)
Replace outdoor unit PC board (A1P).
Connect the thermistor and turn on again.
NO
NO
Replace the thermistor R4T.
YES
YES
Connectoris connected to outdoor
unit PC board(A1P).
Troubleshooting 131
8 -%@-@& %%
“J9” ( #$%-%<./@ M8@ & )8+
&
%%
;%
J9
0%-%
$%
!
$@
$%
;
,<" ,< <,
," "<
$%
;
?<< ,< <,," "< < "
' ,< <,," "< =+8>
' (
8 -%@
∗+A< + "< B(*3
(V3075)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is theresistance
measured afterremoving the thermistor
(R5T) from outdoor unit PC board normal.
(3.5 kΩ to360 kΩ)
Replace outdoor unit PC board (A1P).
Connect thermistor and turn on again.
NO
NO
Replace the thermistor (R5T).
YES
YES
Is theconnector for
subcooling heatexchanger gas pipe
thermistor connected to outdoor unit PC
board (A1P)
132 Troubleshooting
8 -%@-@& %%
4 “JA”( #$%<@ &
%%
;%
JA
0%-%
$%
!
$@
$%
;
<"<< ,<"
$%
;
?<<< ,<" < "
5< ,<"
7"7 <7,
5 (
Troubleshooting 133
8 -%@-@& %%
8 -%@
∗C4,"
∗C+A(BE",< (*
(V2806)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Therelationship
between the ∗1VH and high pressure
is normal (see ∗2) whenvoltage is measured between
X46A pins (1) and (3) ofoutdoor unit PC
board (A1P)(see ∗1).
Replace the high pressure sensor.
Connect the high pressure sensor and turn on again.
NO
NO
Replace outdoor unit PC board A1P.
YES
YES
The highpressure sensor is
connected to X46A ofoutdoor unit PCboard (A1P).
134 Troubleshooting
8 -%@-@& %%
A “JC”( #$%!, &
%%
;%
JC
0%-%
$%
!
$@
$%
;
"7"
$%
;
?<<7" < "
57"
< ,<"7 <7,
5 (
8 -%@
∗C4,"
∗C+A(BE",< (*
(V2808)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Therelationship
between the ∗1VL and low pressure is
normal (see ∗2) when voltageis measured between X45A pins
(2) and (3) of outdoor unitPC board (A1P)
(see ∗1).
Replace the low pressure sensor.
Connect low pressure sensor property and restart system.
NO
NO
Replace outdoor unit PC board A1P.
YES
YES
The lowpressure sensor is
connected to X45A (blue)of outdoor unit PC
board (A1P).
Troubleshooting 135
8 -%@-@& %%
7 “L4”( #$%* 98&
&
%%
;%
L4
0%-%
$%
!
$@
$%
;
' " << <
$%
;
?<<"< 3K'
! <=!3K'>
5 (
5 <
8 -%@
∗+A< + "< B(*3
(V3183)
Resistancecheck of the radiator fin
thermistor
Measure the resistance of the radiator fin thermistor.
Defect of power unit radiation.• Intake port is clogged• Radiator fin is dirty• Outdoor temperature is highNO
Replace the thermistor.
YES
Abnormal
Is reset possible?
Reset and operate.
Normal
Replace the inverter PC boardNO
YES
Temperatureof the radiator fin rises.
Actuates at min.210˚F
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
136 Troubleshooting
8 -%@-@& %%
“L5”( #* & 0- &%
&
%%
;%
L5
0%-%
$%
!
$@
$%
;
7 , <"7
$%
;
?< 7 <"7
= >
5" = E >
"6" =< D>
5 (
8 -%@
; ,<,< "7<< ", <D
(V2812)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Compressor inspection
Inverteroutput
voltage checkInverter output
voltage is not balanced. (Normal if within ±5V Must
be measured whenfrequencyis stable.
Replace the compressor.
Compressor inspectionInspect according to the diagnosis procedure for odd noises, vibration and operating status of the compressor.
NO
Replace the inverter unit.
YES
YES
Correct power supply.YES
Thecompressor's
coil is disconnected or the insulation isdefective.
NO
NO
Disconnect the connection between the compressor and inverter. Make the power transistor check mode setting ON by service mode.
There is instantenious power
drop.
Troubleshooting 137
8 -%@-@& %%
“L8”( #* 0- &%
&
%%
;%
L8
0%-%
$%
!
$@
$%
;
7 , <"7
$%
;
?< <"
"
"
5 (
138 Troubleshooting
8 -%@-@& %%
8 -%@
(V3184)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Output current check
Inverteroutput
voltage check Inverter output voltage
is not balanced (Normal if within ±5V).
Must be measuredwhen frequency
is stable.
Compressor overloadInspection of the compressor and refrigerant system is required.
Compressor inspectionInspect according to the diagnosis procedure for odd noises, vibration and operating status of the compressor.
NO
Replace the inverter PC board.
YES
NO
Reset and restart.NO
The secondarycurrent of the inverter is
higher than 24.9A for each phase.
Replace the compressor.
NO
YESCompressor
inspection Thecompressor's coil is
disconnected.
YES
YES
Disconnect the the connection between the compressor and inverter. Make the power transistor check mode setting ON by service mode.
After turningon again, "L8" blinks
again.
Troubleshooting 139
8 -%@-@& %%
“L9”( #* . &
%%
;%
L9
0%-%
$%
!
$@
$%
;
7 , <"7
$%
;
?< <" ,"
5"
(
5 (
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Inverteroutput
voltage checkInverter output voltage
is not balanced. (Normal if within ±5V) Must
be measured whenfrequencyis stable.
Unsatisfactory pressure equalizationCheck refrigerant system.
Compressor inspectionInspect according to the diagnosis procedure for odd noises, vibration and operating status of the compressor.
YES
Replace the inverter PC board
NO
NO
Reset and restart.NO
The differencebetween high and lowpressure when starting
is above29 psi.
YES
YES
Disconnect the connection between the compressor and inverter. Make the power transistor check mode ON by service mode.
After turningon again, "L9" blinks
again.
(V2814)
140 Troubleshooting
8 -%@-@& %%
“LC”( #$%8 &-,
* %:
&
%%
;%
LC
0%-%
$%
!
$@
$%
;
<D< 7 (( 6
"
$%
;
?<< "
7< ((
5(= >
5 (
5
= >
Troubleshooting 141
8 -%@-@& %%
8 -%@
(V3185)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Thetransmission
wiring between theoutdoor unit PC board
inverter unit isdisconnected.
YES
Fix the disconnection and turn on again.
Connect transmission wiring and turn on again.
NO
YES
The voltagebetween red and
white of X1A on the inverterunit is the power supply
voltage.
Check the noise filter (Z1F) for disconnection, and check the power supply wiring or the inverter PC board.
Replace inverter PC board.
When the LC malfunction occur again, replace control PC board.
NO
NO
YES
NO
Are theconnectors
between the mainPC board (A1P) andinverter PC board (A2P) connected
securely?
Themicrocomputer
monitor (green) onthe inverter PC board
is blinking.
Defect of outdoor main PC board or defect of inverter PC board.
YES
142 Troubleshooting
8 -%@-@& %%
“P4”( #$%* 98&
&
%%
;%
P4
0%-%
$%
!
$@
$%
;
+ < 7<<" " ,
$%
;
?<< < 9 "<
7< < "
P(-P7 "" ,< "
5 "
5 (
8 -%@
∗+A< + "< B(*3
(V2818)
After resetting, restart.
YES
YES
Is theresistance of thermistor
correct?
Is the resetting possible?
Replace inverter PC board.
Measure the resistance of radiation fin thermistor.
NO
Replace inverter PC board.NO
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Troubleshooting 143
8 -%@-@& %%
“PJ”( #9%&-*
9; *
&
%%
;%
PJ
0%-%
$%
!
$@
$%
;
<D< 7 (( 6
"
$%
;
?<< ("
< , (
' ,
8 -%@
∗+A' , B(%3
(V3151)
After resetting, restart.
YES
YES
YES
Is thePC board type
correct?
Is the field setting when
the PC board was replaced correct?*
Replace PC board by the correct one.
Replace the PC board.
NO
Was the PC board replaced?
NO
Correct field setting.NO
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
144 Troubleshooting
8 -%@-@& %%
“UO”( #!, ; ; @ .% ./5%*9%
&
%%
;%
U0
0%-%
$%
!
$@
$%
;
<, <," ""<
$%
;
"G, < < ,
7< < "
, ,,, ,= " " ,>
5< ++-
5"
5 (=!(>
8 -%@
(V2819)
The suctionpipe temperature minuscoil temperature is 68˚F
or higher.
Resistanceis normal when
measured with thesuction pipe thermistor
(R2T) and coil thermistor(R4T) disconnected from
the outdoor unit PC board.(3.5kΩto 360 kΩ)
Out of gas or refrigerant system is clogged. Requires check of refrigerant system.
Replace the thermistor.
Replace the outdoor unit PC board (A1P).
YES
NO
NO
Out of gas, closing of stop valve or refrigerant system is clogged.
Replace main outdoor unit PC board (A1P).
YES
YES
NO
CoolingLow pressure
is 15 psior less.
Thevoltage
of X45A pins (2) and (3) on main
outdoor unit PC board(A1P) is 0.8 VDC or less.
(Low pressuresensor output
voltage)
NO
NO
YES
YES
Replace low pressure sensor.
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Troubleshooting 145
8 -%@-@& %%
4 “U2”( #, % 9%
&
%%
;%
U2
0%-%
$%
!
$@
$%
;
5 , " < "7"",
$%
;
?<<" <,*34
(7""
5 (
5(
7 ,
146 Troubleshooting
8 -%@-@& %%
8 -%@
Correct power supply.NO
Is the voltage ofpower supply208~230 V?
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V3186)
NO
YES
YES
YES
Replace the inverter PC board.
Doesthe voltage
between terminals Pand N gradually rise to
283VDC afterturning
on?
Thevoltage
between the P and Nterminals is 190VDC
or more whenthe compressor is
running.
NO
Is the power supply voltage
at the connector X1A ofoutdoor PC board
side?
Is thepower supply voltage applied at LB and NB
on the noise filterPC board?
Monitor field power supply.
Check the transmission wiring between the outdoor unit PC board and inverter unit.
NOReplace the inverter PC board.
YES
NO
Replace the inverter PC board.
Turn on again.
YES
Troubleshooting 147
8 -%@-@& %%
A “U3”( #@H( ./&
%%
;%
U3
0%-%
$%
!
$@
$%
;
<D"
$%
;
7<< " 7 <<D"
<D"
8 -%@
(V3052)
Has the check operation
performed on Outdoor unit PC board?
Press the BS4 on PC board on the master outdoor unit for 5 seconds or more to execute check operation.
Replace the main PC board on the outdoor unit.
NO
YES
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
148 Troubleshooting
8 -%@-@& %%
7 “U4”$%8 &-,
(
&
%%
;%
U4
0%-%
$%
!
!
$@
$%
;
"<D 7
$%
;
?<
E 7 ,'E' E<
7,7 ,
"7"" ''
@<
5 (
5 (
Troubleshooting 149
8 -%@-@& %%
8 -%@
(V3187)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Isindoor - outdoor
and outdoor - outdoor unittransmission wiring
normal?
Supply 208~230 V.
Replace the fuse.
Fix the indoor/outdoor or outdoor/outdoor unit transmission wiring.
Push and hold the RESET button on the outdoor unit PC board for 5 seconds.
Replace the outdoor unit PC Board (A1P).
YES
YES
NO
YES
Replace the indoor unit PC Board.
Push and hold the RESET button on the master outdoor unit PC Board for 5 seconds.
Fix the indoor/outdoor or outdoor/outdoor unit transmission wiring.
YES
NO
NO
YES
Hasthe indoor
or outdoor unit PCboard been replaced,
or has the indoor - outdooror outdoor - outdoor unit
transmission wiringbeen
modified?
Allindoor unit
remote controllers of thesame refrigerant system
display"U4."
NOOutdoor
unit PC boardmicrocomputer monitor
(HAP) blinks.
NO
NO
NO Operationready lamp (H2P) is
blinking.
Lamp doesnot go off for 12 minutes
or more.
Is indoor- outdoor and outdoor -
outdoor unit transmissionwiring normal?
YESThe fuse on the outdoor unit's PC
board is burnt.
Replace the transformer.
Replace outdoor unit PC board. (A1P)
NOThe
secondary voltageof the transformer is about
22~24 V.
NO
Thevoltage between
terminals L1 and N of the outdoor unit PC board
is 208~230 V.
∗ The unit will not operate for up to 12 minutes.
Reset the power supply.
YES
YESYES
NO
YES
150 Troubleshooting
8 -%@-@& %%
“U5” #$%8 &-,
& %%
&
%%
;%
U5
0%-%
$%
!
$@
$%
;
,7 <6E<D< , " ,
7 = >
$%
;
" "
7 =7< ,>
5 (
5(
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2823)
NO
YES YES
NO
Replace indoor unit PC board.
Set one remote controller to "SUB"; turn the power supply off once and then back on.
There is possibility of malfunction caused by noise. Check the surrounding area and turn on again.
NO NO
Using2-remote controllers
control.
All indoorPC board microcomputer
monitors blink.
YESMulti-core cable
is used for the indoorunit remote controller
transmissionwiring.
Operationreturns to normal whenthe power is turned off
momentarily.
YES YESSS1 of
both remote controllersis set to "MAIN."
NO
Switch to double-core independent cable. replacement
Defect of remote controller PC board or indoor unit PC board. Replace whichever is defective.
Troubleshooting 151
8 -%@-@& %%
“U8” #$%8 &-,
$-& %%
&
%%
;%
U8
0%-%
$%
!
$@
$%
;
,7 <6E<D< , " ,
7 = >
$%
;
" "
7
7
5(
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2825)
SS1of both remote controllers is
set to "SUB."
Set SS1 to "MAIN"; the power supply off once and then back on.
Set one remote controller to "MAIN"; the power supply off once and then back on.
Turn the power off and then back on. If a malfunction occurs, replace the remote controller PC board.
YES
YESYES
NO
NO
NOUsing 2-remote controllers control.
SS1of remote controller PC boards
is set to "MAIN."
152 Troubleshooting
8 -%@-@& %%
“U9” #$%8 &-,
( @&&
&
%%
;%
U9
0%-%
$%
!
$@
$%
;
5< ,< 7 < <
$%
;
?<< < 7 < <
7 < <
" <
5( <
"" 7 ,7
Troubleshooting 153
8 -%@-@& %%
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2826)
The "U4"display blinks on
the remote controllers ofother units within the
same refrigerantsystem.
Refer to failure diagnosis for "U5" malfunction code.
Re-diagnose by display after passage of 2 minutes or more.
NO
YES
Refer to failure diagnosis for "U4" malfunction code.
NO
YES
"U9"has been displayed for 2
minutes or more.
NO
Turn on all indoor units.
Refer to failure diagnosis for "A1" malfunction code.
NO
YES
The "A1" display blinks on
the remote controllers ofother units within the
same refrigerantsystem.
Refer to failure diagnosis for "UA" malfunction code.
YES
The "UA" display blinks on the
remote controllers of other units within the same
refrigerant system.
Refer to failure diagnosis for "A9" malfunction code.
NO
YES
The "A9"display blinks on
the remote controllers ofother units within the
same refrigerantsystem.
154 Troubleshooting
8 -%@-@& %%
“UA”& &- (
G & %%
&
%%
;%
UA
0%-%
$%
! ! +
$@
$%
;
! <" ,7 < <7,
$%
;
< <<
5 (=!(> < ,< ," ,(7" ,""(
8 -%@
∗ < < , "
<"
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V3169)
The totalof indoor units
displaying "UA" andindoor units connected to the
same refrigerant system iswithin connectable
number ofunit∗
Normal
NO
NO
There are too many indoor units within the same refrigerant system.
Push and hold the RESET button on the outdoor unit PC board for 5 seconds.
YES
Is the outdoor PC board replacedto spare parts PC
board ?
YESThe setting after replacing spare PC board has not been set yet.Refer page 70.
NO
YES
Does a malfunction occur?
Replace outdoor unit PC board (A1P).
Matches the refrigerant type of indoor and outdoor unit.
NO
YES
Does therefrigerant type of indoor
and outdoor unitmatch?
Troubleshooting 155
8 -%@-@& %%
“UC”0 ;% %& %%
&
%%
;%
UC
0%-%
$%
!
$@
$%
;
<" " << 7<
$%
;
< <
!" :
5 (
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2828)
Replace indoor unit PC board.
Address duplication of central remote controllerThe setting must be changed so that the central remote control address is not duplicated.
YES
NO
Optionalcontrollers for
centralized control are connected to the
indoor unit.
156 Troubleshooting
8 -%@-@& %%
“UE”$%8 &-, %
& %%
&
%%
;%
UE
0%-%
$%
!
$@
$%
;
"<D 7
$%
;
?<
7" :
,
' (
5 (
Troubleshooting 157
8 -%@-@& %%
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Isthe power supply
turned on for indoor unitsdisplaying
malfunction?
Istransmission wiring
disconnected orwired incorrectly?
Isthe transmission
wiring with the mastercontroller disconnected
or wiredincorrectly?
Is themaster controller's
connector for settingmaster controller
disconnected?
Set the group No. correctly.
Replace indoor unit PC board.
Fix the wiring correctly.
Fix the wiring correctly.
Connect the connector correctly.
Replace the central remote controller.
Reset power supply simultaneously for all optional controllers for centralized control.
YES
YES
NO
YES
YES
YES
YES
Turn indoor unit's power supply.
YES
NO
NO
NO
NO
NO
NO
Hasan indoor unit once
connected been removedor its address
changed?
Is the groupNo. of malfunctioning
indoor units set?
Istransmission with
all indoor unitsmalfunctioning?
(V2829)
158 Troubleshooting
8 -%@-@& %%
“UF”&
&
%%
;%
UF
0%-%
$%
!
!
$@
$%
;
< <<
7 <<, "" <D
$%
;
< < <,<
<D ,< <<D"
"" 7 ,7 6 6
' <D"
5 (
' "<"
8 -%@
"# ? ,<D" < <
<<E , <
<
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2830)
Is indoor - outdoor
and outdoor - outdoor unit transmission wiring
normal?
Replace indoor unit PC board.
Wiring check operation may not have been carried out successfully.
After fixing incorrect wiring, push and hold the RESET button on the master outdoor unit PC board for 5 seconds.
YES
NOYES
NO
NO
YESIs the check operation
carried out?
Is indoor-outdoor and outdoor-
outdoor unit transmissionwiring normal?
Open stop valve.
YES
NOAre the stopvalves openned?
∗ The unit will not run for up to 12 minutes.
Troubleshooting 159
8 -%@-@& %%
4 “UH”$%&G &0
&
%%
;%
UH
0%-%
$%
!
!
$@
$%
;
5 7 < ,
$%
;
< <
"" 7 ,7 6 6
5 (
5 (=!(>
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2831)
NO
YES
YES
After fixing incorrect wiring, push and hold the RESET button on the master outdoor unit PC board for 5 seconds.
Normal
NO
Iselectricity
being introduce forthe first time after
installation or after an indooror outdo or unit PC
board has beenreplaced?
Isindoor - outdoor and
outdoor - outdoor unittransmission wiring
normal?
YES
NormalNODoes a
malfunction occur?
NODoes
a "UH" malfunction occurfor all indoor units in
the system?
YES NO
Doesa malfunction
occur even after 12minutes elapses from the
time when electricity is introduced to indoor
and outdoorunits?
YES
Replace indoor unit PC board.
Replace outdoor unit PC board (A1P).
Push and hold the RESET button on the outdoor unit PC board for 5 seconds
∗ The unit will not run for up to 12 minutes.
160 Troubleshooting
8 -%@-@ %& %%
8 -%@-@ %
& %%
“UE”$%8 &-, %
& %%
& %%
;%
UE
0%-%
$%
!
+
$@
$%
;
"<D 7
$%
;
?<
7
,
' (
5 (
Troubleshooting 161
8 -%@-@ %& %%
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is thepower supply turned
on for indoor units displayingmalfunction?
Istransmission wiring
disconnected or wired incorrectly?
Is thetransmission wiring
with the master controller disconnected or wired
incorrectly?
Is themaster controller's
connector for settingmaster controller
disconnected?
Set the group No. correctly.
Replace indoor unit PC board.
Fix the wiring correctly.
Fix the wiring correctly.
Connect the connector correctly.
Replace the central PC board.
Reset power supply simultaneously for all optional controllers for centralized control.
YES
YES
NO
YES
YES
YES
YES
Turn indoor unit's power supply.
YES
NO
NO
NO
NO
NO
NO
Hasan indoor unit once
connected been removeor its address
changed?
Is the groupNo. of malfunctioning
indoor units set?
Is transmissionwith all indoor units
malfunctioning?
(V2832)
162 Troubleshooting
8 -%@-@ %& %%
“M1”: ;&
%%
;%
M1
0%-%
$%
$@
$%
;
5 <56"
$%
;
?<R" 6" <
5(
8 -%@ +"<
Troubleshooting 163
8 -%@-@ %& %%
“M8”$%8 &-,(%
%% %C %
&
%%
;%
M8
0%-%
$%
$@
$%
;
5< ,56 =<7
>
$%
;
?< "< <"
?<" < :7< <7E<7
"
7" :
5(" :
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2833)
Istransmission wiring
disconnected or wired incorrectly?
The PC board of one of the optional controllers for centralized control is defective. Try turning on/off using each optional controllers for centralized control, and replace the PC board of the one that is unable to control the indoor unit.
NO
NO
Fix the wiring correctly.
YES
YES
Has a onceconnected optional
controller for centralized control been disconnected
or its addresschanged?
Turn on power supply for all optional controllers for centralized control.
Reset power supply simultaneously for all optional controllers for centralized control.
YES
NO
Isthe power supply
turned on for all optionalcontrollers for
centralizedcontrol?
Set reset switch to "normal."
YES
NO
Isthe reset switch
of all optional controllersfor centralized control set
to ''normal?''
164 Troubleshooting
8 -%@-@ %& %%
“MA”& &-(% %%
%C %
&
%%
;%
MA
0%-%
$%
$@
$%
;
5< ,56
$%
;
?<<< E<" "
?< ""
?<<" "
"" " :
<
5(" :
Troubleshooting 165
8 -%@-@ %& %%
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2834)
NO
NO
Cannot be used in combination with a wiring adaptor for electrical appendices. Remove the wiring adaptor for electrical appendices and reset the power supply for all optional controllers for centralized control simultaneously.
Schedule timer and parallel interface cannot be used in combination. Disconnect either the schedule timer or parallel interface and reset the power supply for all optional controllers for centralized control simultaneously.
Disconnect the schedule timer's individual / combined connector and reset the power supply for all optional controllers for centralized control simultaneously.
Arrange so that the connector for setting master controller is connected to one controller for centralized control and reset the power supply for all optional controllers for centralized control simultaneously.
Disconnect the connector for setting master controller from the master controller, connect to another optional controller for centralized control and simultaneously reset all optional controllers for centralized control again. The controller connected by the connector for setting master controller when the malfunction is cleared is defective and must be replaced.
Reset the power supply forall optional controllers for centralized control simultaneously.
YES
YES
Isthe wiring adaptor forelectrical appendices
connected?
YESIs a schedule timerconnected?
Arethere two
or more optionalcontrollers for centralizedcontrol connected with the
connector for settingmaster
controller?
YESIs a parallel interfaceconnected?
NO
YESIs
the schedule timer's individual/combined
connector connected?
NO
NO
If the malfunction is still not cleared:
166 Troubleshooting
8 -%@-@ %& %%
“MC”0 ;%G&
&
%%
;%
MC
0%-%
$%
$@
$%
;
5< ,56
$%
;
7 <
!"
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Are twoor more central
remote controllersconnected?
If the two units are both set to master controller mode or sub control mode, set either of the units to master controller mode and then rest the power supply of the central remote controller.
Reset power supply of the central remote controller.
NO
YES
(V2835)
Troubleshooting 167
8 -%@-@("'(99 %%
4 8 -%@-@("'
(99 %%
4 ( !&:%H
&
%%
;%
" " D
0%-%
$%
!
''
$@
$%
;
5< ,56
$%
;
7
,
5 ''
5 (
168 Troubleshooting
8 -%@-@("'(99 %%
8 -%@
(V2841)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is thepower supply for
the indoor unit displayinga malfunction
turnedon?
Istransmission wiring
disconnected or wired incorrectly?
Is thetransmission
wiring with the mastercontroller disconnected or
wired incorrectly?
Is themaster
controller's connector forsetting master controller
disconnected.
Set the group No. correctly.
Replace indoor unit PC board.
Fix the wiring correctly.
Fix the wiring correctly.
Connect the connector correctly.
Replace the central PC board.
Reset power supply for all optional controllers for centralized control simultaneously.
NO
YES
NO
YES
YES
NO
YES
Turn the power supply of the indoor unit on.
YES
NO
NO
YES
NO
YES
NO
Has aonce connected
indoor unit been removedor its address
changed?
Diagnose the cause with the air conditioner's failure diagnosis manual.
NO
YES
Is amalfunction
code displayed on theremote controller?
Isthe group
No. of malfunctioningindoor units
set?
Istransmission
with all indoor units malfunctioning?
Troubleshooting 169
8 -%@-@("'(99 %%
4 ;%D %C %E:%H)
%:%H+
&
%%
;%
A :B=+" , D>
0%-%
$%
''
<
$@
$%
;
5< ,56
$%
;
?<< :E7< <7E<7"
<,""
?< ""
?<<< E< "
?<<7 ," "" "
!"
"" " :
<
7" :
5(" :
170 Troubleshooting
8 -%@-@("'(99 %%
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2842)
Is thereset switch
of all optional controllersfor centralizedcontrol set to
"normal"?
Istransmission wiring
disconnected or wiredincorrectly?
Correct the setting of the unified ON / OFF controller's switch for setting each address and reset the power supply of the unified ON / OFF controller.
Refer to failure diagnosis for central remote controller or schedule timer.
NO
YES
YES
NO
NO
Fix the wiring correctly.
Set reset switch to "normal."
NO
NO
YES
YES
YES
Is thepower supply
turned on for alloptional controllers for
centralizedcontrol?
Reset power supply simultaneously for all optional controllers for centralized control.
NO
YES
Has a onceconnected optional
controller for centralized control been disconnected
or itsaddress changed?
Is thecentral remote
controller or scheduletimer displaying a
malfunction?
Isa central remote
controller or schedule timer connected?
Turn on power supply for all optional controllers for centralized control.
NO
YES NO
Is the settingof the unified
ON / OFF controller'sswitch for setting
each addressduplicated?
Aretwo or more unified
ON / OFF controllersconnected?
YES
2A
Troubleshooting 171
8 -%@-@("'(99 %%
NO
NO
Cannot be used in combination with a wiring adaptor for electrical appendices. Remove the wiring adaptor for electrical appendices and reset the power supply for all optional controllers for centralized control simultaneously.
Schedule timer and parallel interface cannot be used in combination. Disconnect either the schedule timer or parallel interface and reset the power supply for all optional controllers for centralized control simultaneously.
Disconnect the schedule timer's individual / combined connector and reset the power supply for all optional controllers for centralized control simultaneously.
Arrange so that the connector for setting master controller is connected to one controller for centralized control and reset the power supply for all optional controllers for centralized control simultaneously.
Disconnect the connector for setting master controller from the master controller, connect to another optional controller for centralized control and simultaneously reset all optional controllers for centralized control again. The controller connected by the connector for setting master controller when the malfunction is cleared is defective and must be replaced.
Reset the power supply for all optional controllers for centralized control simultaneously.
YES
YES
Is thewiring adaptor for
electrical appendicesconnected?
YESIs a schedule timerconnected?
Arethere two or
more optionalcontrollers for centralizedcontrol connected with the
connector for settingmaster
controller?
YESIs a parallel interface
connected?
NO
YESIs the
schedule timer's individual/combined
connectorconnected?
NO
NO
If the malfunction is still not cleared:
2A
(V2843)
172 Troubleshooting
8 -%@-@("'(99 %%
4 ;%D %C %E:%H)
;-%:%H+
&
%%
;%
A :B=+" D>
0%-%
$%
''
$@
$%
;
5< ,56
$%
;
?<
?< 7 < <,
=,">
"", ,7 <
""7 , 7 ,
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2844)
Is the controlrange setting switch
set correctly?
Isthe transmission
wiring disconnected orwired incorrectly?
Replace the PC board of the unified ON/OFF controller.
Fix the wiring correctly.
Set by remote controller the central control address for all indoor units connected to the central control line.
YES
YES
Set the control range setting switch correctly and simultaneously reset the power supply for all optional controllers for centralized control.
NO
NO
NO
YES
Is the centralcontrol address (group No.)
set for theindoor unit?
Troubleshooting 173
8 -%@)(#@%8& +
A 8 -%@)(#@%8& +
A “UE”$%8 &-, %
& %%
&
%%
;%
UE
0%-%
$%
<
!
$@
$%
;
"<D 7
$%
;
?<
7
5 ,= 7 < ,
>
5< (
5 (
174 Troubleshooting
8 -%@)(#@%8& +
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2836)
Isthe power supply
turned on for indoorunits displaying
malfunction?
Istransmission wiring
disconnected or wired incorrectly?
Isthe transmission
wiring with the mastercontroller disconnected or
wired incorrectly?
Isthe master controller'sconnector for setting
master controllerdisconnected?
Set the group No. correctly.
Replace indoor unit PC board.
Fix the wiring correctly.
Fix the wiring correctly.
Connect the connector correctly.
Replace the central PC board.
Reset power supply simultaneously for all optional controllers for centralized control.
NO
YES
NO
YES
YES
NO
NO
Turn indoor unit's power supply.
YES
NO
NO
YES
YES
YES
NO
Hasan indoor unit
once connected beenremoveor its address
changed?
Is the groupNo. of malfunctioning
indoor units set?
Istransmission with all
indoor unitsmalfunctioning?
Troubleshooting 175
8 -%@)(#@%8& +
A “M1”: ;&
%%
;%
M1
0%-%
$%
<
$@
$%
;
5 <56"
$%
;
?<R" 6" <
5< (
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Reset power supply.
Does thesystem return to normal?
YES
NO
External factor other than equipment malfunction (noise etc.)
Replace the schedule timer.
(V2837)
176 Troubleshooting
8 -%@)(#@%8& +
A “M8”$%8 &-,(%
%% %C %
&
%%
;%
M8
0%-%
$%
! E<
$@
$%
;
5< ,56 =<7
>
$%
;
?<<" :E7< <7E<7
"
7" :
5(" :
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2838)
Istransmission wiring
disconnected or wiredincorrectly?
The PC board of one of the optional controllers for centralized control is defective. Try turning on/off using each optional controllers for centralized control, and replace the PC board of the one that is unable to control the indoor unit.
YES
NO
Fix the wiring correctly.
YES
NO
Has a once connected
optional controller forcentralized control been
disconnected or its address changed?
Turn on power supply for all optional controllers for centralized control.
Reset power supply simultaneously for all optional controllers for centralized control.
YES
NO
Isthe power supply
turned on for all optionalcontrollers for
centralizedcontrol?
Set reset switch to "normal."
YES
NO
Isthe reset switch
of all optional controllersfor centralized control
set to "normal" ?
Troubleshooting 177
8 -%@)(#@%8& +
A “MA”& &-(% %%
%C %
&
%%
;%
MA
0%-%
$%
!
<
$@
$%
;
5< ,56
$%
;
?<<< E<" "
?< ""
"" " :
<
5(" :
178 Troubleshooting
8 -%@)(#@%8& +
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Disconnect the schedule timer's individual / combined connector and reset the power supply for all optional controllers for centralized control simultaneously.
Arrange so that the connector for setting master controller is connected to one controller for centralized control and reset the power supply for all optional controllers for centralized control simultaneously.
Disconnect the connector for setting master controller from the master controller, connect to another optional controller for centralized control and simultaneously reset all optional controllers for centralized control again. The controller connected by the connector for setting master controller when the malfunction is cleared is defective and must be replaced.
Reset the power supply for all optional controllers for centralized control simultaneously.
YES
YES
NO
Is the schedule timer connected?
Arethere two or
more optionalcontrollers
for centralized control connected with the
connector for settingmaster
controller?
YESIs the scheduletimer's individual/combined
connector connected?
NO
NO
Cannot be used in combination with a wiring adaptor for electrical appendices. Remove the wiring adaptor for electrical appendices and reset the power supply for all optional controllers for centralized control simultaneously.
YESIs the wiring
adaptor for electricalappendicesconnected?
NO
Schedule timer and parallel interface cannot be used in combination. Disconnect either the schedule timer or parallel interface and reset the power supply for all optional controllers for centralized control
YESIs a parallel interface connected?
NO
If the malfunction is still not cleared:
(V2839)
Troubleshooting 179
8 -%@)(#@%8& +
A “MC”0 ;%G&
&
%%
;%
MC
0%-%
$%
! E
<
$@
$%
;
5< ,56
$%
;
?<7<
!" <
8 -%@
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
(V2840)
Are two or moreschedule timer
connected?
Reset the power supply for the schedule timer.
Disconnect all schedule timer except one and reset the power supply.
YES
NO
180 Troubleshooting
@H
7 @H
@H" @H & ), %-%+
=> <"7""
< 7"<E4E?< =<6
7 ><D<<< < ,E7<
Red
White
Black
U
V
W
Measure the resistancevalues between phasesU,V,W.
Troubleshooting 181
@H
@H" @H 9%( :
=> 5 <.3$!7 <<"7""''" ''
=> <,7" -#.3$!845 ,<"7""
_
=#> <,7" -.3$!845_
=-> <.3$!7 <<"7""''" ''
=8> ?<D ,<""< ,<"7""E
"=384>,- 7" -.3$!_=<
<< 7 <<>
=$> 5 <.3%!7 <<"7""''" ''
=%> <,7" -#.3%!845 ,<"7""
_
=)> <,7" -.3%!845_
=*> <.3%!7 <<"7""''" ''
=3>?<D ,<7< ,<"7""E
"=384>,- 7" -.3%!_
=>=%>C→'(→+"<(
=#>=)>C→'(→+"<(
=8>=3>C→'<→+"<5
=>=#>=8>=%>=)>=3>C/→+"<(
1
2
3
4
5
6
7
Fan speed pulse input (0V and 5V)
0V
15V
GND
NC
NC
250~350V(during operation)(S2679)
182 Troubleshooting
!"" )#
Part 8Part 8Part 8Part 8AppendixAppendixAppendixAppendix
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184 Appendix
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Liquid piping connection port
Fan
R3T
R1T
Electronicexpansion valve
Filter Filter
R2T
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) φ φ--#3#$-) φ8) φ#)
Appendix 185
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188 Appendix
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3D045644A
Appendix 189
8@ & '8& @
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190 Appendix
8@ & '8& @
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##) $3*# #) 8 $*$- #) 3 *8
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Appendix 191
High Pressure (PH)
Low Pressure (PL)
PH : Detected Pressure [High Side]PL : Detected Pressure [Low Side]VH : Output Voltage [High Side] VDC
VL : Output Voltage [Low Side] VDC
PH = 1.38V-0.69PL = 0.57V-0.28PH : High pressureVL : Low pressureV : Voltage (V)
Output Voltage (VH, VL)
Detected Pressure
(V3053)
192 Appendix
( 7+ ,=+-3> *#
Part 9Precautions for NewPrecautions for NewPrecautions for NewPrecautions for NewRefrigerant (R410A)Refrigerant (R410A)Refrigerant (R410A)Refrigerant (R410A)
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*- ( 7+ ,=+-3!>
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Temperature( )
Steam pressure (kPa)
Liquid Vapor
Density (kg/m3
)Liquid Vapor
Specific heat at constant pressure (kJ/kgK)Liquid Vapor
Specific enthalpy (kJ/kg)
Liquid Vapor
Specific entropy(kJ/KgK)
Liquid Vapor
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φ6.4φ9.5
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Material
OOOOO
1/2H1/2H1/2H1/2H1/2H1/2H
Material
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1/2H1/2H1/2H1/2H1/2H1/2H1/2H
Thickness[mm]0.80.80.81.01.01.01.01.01.21.41.6
Thickness [mm]
0.80.80.81.01.01.01.01.01.11.41.6
R407C R410A
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6.35
9.52
12.70
15.88
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9.1
13.2
16.6
19.7
24.0
Class-1 (Conventional)
9.0
13.0
16.2
19.4
23.3
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Unit:mm
A
Dimension A
For class-1: R407CFor class-2: R410A
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