1
Service manual
Room airconditioner
Split Wall-Mounted Type
NOTE:
Before servicing the unit, please read this first
Always contact with your service center if meet
problem.
2
Table of Contents
1Summary 3
2Model explaining .4
3Installation..4
4Exploded view and part list..8
5Operation principle.9
6Specifications10
7Wiring diagrams...11
8PCB principle chart.....16
9PCB function ......17
10Troubleshooting....33
3
1. Summary
1.1 indoor unit
Model 38B model 85
1.2 outdoor unit
9000BTU 1200018000 BTU
22000 BTU 2400026000 BTU
4
2Model explaining
c
Improve an ordinal number
Divide the body outdoors box a body code
External appearance characteristic code
Separately the body indoor machine(or whole type) style code
Code of refrigerant typeno code - R22C-R407cA-R410a
Power type1:115v/60Hz 2:220V/60Hz3:220-240V/
50Hz4:240V/50Hz
Main function code: c-Cold breeze type;H-Hot pump type;A-Hot
pump the type take assistance electricity to heat;E-The electricity
heat
Capacity code: x1000W
Separately the body pit code inside the indoor machine(or whole
type)
Structure form code
Special craft code:Q-Deal with contact quickly;S-Soft start;d-
Outside tube in addition to frost
The weather type code(T1 type code abridge)
"C" CHIGO brand
Such as: CS-25C3A-V85AY1
T1 climate type,wall split type air conditioner, cooling capacity is 2500Wpower is 220V/50Hz/1PH
refrigeration is R410A,the kernel of indoor unit is fresh 98the pattern no. is 85first time design, outdoor unit is 1HP
of 2003 year
Indoor unit modle isCS-25C3A-V85Aoutdoor unit model isCS-25C3A-Y1
5
3. Attention of installation
3.1 Safety Precaution
To prevent injury to the user or other people and property damage, the following instructions must be followed.
Incorrect operation due to ignoring instruction will cause harm or damage.
Before service unit, be sure to read this service manual at first.
3.2 Warning
Installation
Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated circuit.
There is risk of fire or electric shock.
For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized service center.
Do not disassemble or repair the product, there is risk of fire or electric shock.
Always ground the product.
There is risk of fire or electric shock.
Install the panel and the cover of control box securely.
There is risk of fire of electric shock.
Always install a dedicated circuit and breaker.
Improper wiring or installation may cause fore or electric shock.
Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.
Do not modify or extend the power cable.
There is risk of fire or electric shock.
Do not install, remove, or reinstall the unit by yourself (customer).
There is risk of fire, electric shock, explosion, or injury.
Be caution when unpacking and installing the product.
Sharp edges could cause injury, be especially careful of the case edges and the fins on the condenser and evaporator.
For installation, always contact the dealer or an Authorized service center.
There is risk of fire, electric shock, explosion, or injury.
Do not install the product on a defective installation stand.
It may cause injury, accident, or damage to the product.
6
Be sure the installation area does not deteriorate with age.
If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal injury.
Do not let the air conditioner run for a long time when the humidity is very high and a door or a windows is left open.
Moisture may condense and wet or damage furniture.
Take care to ensure that power cable could not be pulled out or damaged during operation.
There is risk of fire or electric shock.
Do not place anything on the power cable.
There is risk of fire or electric shock.
Do not plug or unplug the power supply plug during operation.
There is risk of fire or electric shock.
Do not touch (operation) the product with wet hands.
There is risk of fire or electric shock.
Do not place a heater or other appliance near the power cable.
There is risk of fire and electric shock.
Do not allow water to run into electric parts.
It may cause fire, failure of the product, or electric shock.
Do not store or use flammable gas or combustible near the product.
There is risk of fire or failure of product.
Do not use the product in a tightly closed space for a long time.
Oxygen deficiency could occur.
When flammable gas leaks, turn off the gas and open a window for ventilation before turn the product on.
Do not use the telephone or turn switches on or off. There is risk of explosion or fire.
If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the power supply cable.
There is risk of electric shock or fire.
Stop operation and close the window in storm or hurricane. If possible, remove the product from the window before the hurricane
arrives.
There is risk of property damage, failure of product, or electric shock.
Do not open the inlet grill of the product during operation. (Do not touch the electrostatic filter, if the unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.
When the product is soaked (flooded or submerged), contact an Authorized service center.
There is risk of fire or electric shock.
Be caution that water could not enter the product.
7
There is risk of fire, electric shock, or product damage.
Ventilate the product from time to time when operating it together with a stove, etc.
There is risk of fire or electric shock.
Turn the main power off when cleaning or maintaining the product.
There is risk of electric shock.
When the product is not be used for a long time, disconnect the power supply plug or turn off the breaker.
There is risk of product damage or failure, or unintended operation.
Take care to ensure that nobody could step on or fall onto the outdoor unit.
This could result in personal injury and product damage.
CAUTION
Always check for gas (refrigerant) leakage after installation or repair of product.
Low refrigerant levels may cause failure of product.
Install the drain hose to ensure that water is drained away properly.
A bad connection may cause water leakage.
Keep level even when installing the product.
To avoid vibration of water leakage.
Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods.
It may cause a problem for your neighbors.
Use two or more people to lift and transport the product.
Avoid personal injury.
Do not install the product where it will be exposed to sea wind (salt spray) directly.
It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunction or
inefficient operation.
Operational
Do not expose the skin directly to cool air for long periods of time. (Do not sit in the draft).
This could harm to your health.
Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a consumer air conditioner, not a
precision refrigerant system.
There is risk of damage or loss of property.
Do not block the inlet or outlet of air flow.
It may cause product failure.
8
Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
There is risk of fire, electric shock, or damage to the plastic parts of the product.
Do not touch the metal parts of the product when removing the air filter. They are very sharp.
There is risk of personal injury.
Do not step on pr put anything on the product. (outdoor units)
There is risk of personal injury and failure of product.
Always insert the filter securely. Clean the filter every two weeks or more often if necessary.
A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage.
Do not insert hands or other object through air inlet or outlet while the product is operated.
There are sharp and moving parts that could cause personal injury.
Do not drink the water drained from the product.
It is not sanitary could cause serious health issues.
Use a firm stool or ladder when cleaning or maintaining the product.
Be careful and avoid personal injury.
Replace the all batteries in the remote control with new ones of the same type. Do not mix old and mew batteries or different types of
batteries.
There is risk of fire or explosion.
Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
They may burn of explode.
If the liquid from the batteries gets onto your skin or clothes, wash it well with clean water. Do not use the remote of the batteries have
leaked.
The chemical in batteries could cause burns or other health hazards.
3.3 Installation details
Wrench torque sheet for installation
Outside diameter Torque
mm inch Kg.m
6.35 1/4 1.8
9.52 3/8 4.2
12.7 1/2 5.5
15.88 5/8 6.6
19.05 3/4 6.6
9
Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Grade
Unit 7K 9K 12K 18K 24K 28K
mm2 1.0 1.0 1.5 2.5 2.5 2.5
Pipe length and the elevation
Capacity Pipe size
Standard length Max. Max. Additional
(m) Elevation Elevation refrigerant
Btu/h GAS LIQUID B (m) A (m) (g/m)
9K-12K 3/8 (9.52) 1/4 (6.35) 3.5 5 10 30
18K-22K 1/2 (12.7) 1/4 (6.35) 4 10 15 30
24K-28K 5/8 (15.88) 3/8 (9.52) 5 15 20 65
Caution:Capacity is base on standard length and maximum allowance length is base of reliability.Oil
trap should be install per 5-7 meters.
4Indoor unit and outdoor unit explosion diagram and spare parts list(see explosion diagram file)
5. Refrigerant cycle diagram
5.1 Cooling only
10
5.2 Heat pump mode
6. Specifications (see spec sheet)
11
7.Wiring diagrams
7.1Indoor unit
12
13
14
15
7.2 Outdoor unit
16
8.PCB principle chart
8.138 section of crystal color ordinary schematic diagram
1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
CN4T
D1-D4
IN4001
Vin1
GN
D
2
OUT3
IC4 7805
T
Z R
471 10A
E 1
1000UF/35V
E 3
220UF/16V
C1
104
C3
104
X3A
X4A
R1 51 /1W
GND
+5B
CNB
FMC
CM
U
N
FUSE
F3A 250V
U1
N1
MC2003
B
B
JZC-7F*2
5
6
7
4
3
2
1
12
11
10
13
14
15
16
8
GND
GND
52X4B
52X5B
52X6B
52CB
9
Q3
1815
R7 4.7K
Q2
9013
R13 4.7K
26
BUZZ
P03
P237
C24
102
D6
IN4148
C13
104
E 4
22UF/25F
B
R33
2K
BZ
GND GND
C17
104
GND
C21
104/275V
+5
C7104
C9104
R20
4.3K
R19 510
C8104
R18
4.3k
R17 510
C6104
TEMP
Tp
Tr
43
21
P21/AN1
P20/AN0
5
4
CNG
/RESET11
D5
AC.ZERO
XL
8.00R15
300K
R2
4.7K
R3 10K
C11
102
R22
10K
+5
R5
4.7K
Q1
C1815
C12
102
R23 4.7K
+5
R24 10K
R4 10K
+5
C18
101
R21
4.7K
R16
10K
+5
SW 1
15
14
AC..ZERO
32
1CNTR0
INT0
Xout
Xin
Vcc13
3
22
P14
P37
16Vss
6P22
P3421
CNW
+5
C4 104
E 5
10uf/16FC14
102
GNDGND
GND
GNDGND
GNDGND
GNDGND
GND
GND
GND
GND
GND
P11
P0023
32
R27 51
R26 51
C15
102
C16
102
R9
4.7K
R8
4.7K
D11 4148 D9 4148 D7 4148
R10
4.7K
Q6
9012
R11
4.7K
R12
4.7K
+5
Q4
9012
Q5
9012
P12
P13
1
2
P259
P3017
P3118
heat/cool
dhon/off
D12 4148 D10 4148 D8 4148
R31
4.7K
R30
4.7K
R32
4.7K
TYPE1.0HSTP.0
HSTP.1
/
/ TYPE1.1
GND
+5
+5
+5
2
3
COM3
COM2
COM1
CLOCK
DATA
S
GND
+5V
1
CN1
GND
GND
27
28
29
30
P04
P05
P06
P07
31
25P02
P10
P0124
+5
R14
390IC5
MC3021
R6 4.7K
Q7
1815
IC6
BCR
R37 330
R36
220
C20
473/275V
P248
L 1
CFI
1.2uF
N
C23
104/275V U2
GND
CNU
5
4
3
2
1
1
4
6
2
1
5
3
3
21
5
4
3
1
2
GND
C5
102
C10
102
GND
GND
C19
104
R25
510
GND
52C-1A
52X6A
COM
CN
COM
GND
CN D
U1
HS0 0 3 8
3754438
4
5
6
CL OC K
DA TA
E 1 22UF/16V
+-
S
123
RMT
R1 51
+51 4
C3 C2
1 0 21 0 2
R1110K
R1210K
GND
+5
B1
A2
Q0
3
Q1
4
Q2
5
Q4
10
Q5
11
Q6
12
CL
K
8
MR
9
Q3
6V
ss
7
Q7
13
IC1
74AL S164
R7510*8
R3
R2
R4
R9
R8
R6
R5
a
bf
c
g
e
co
m2
dp
a
bf
c
g
e dp
co
m1
dd
L E D
DPY-8*2
L E D6
L E D7
L E D5
L E D4
L E D1
L E D2
gbc fhd ae
D2
D1
L E D3
8
7
Q 6 A
Q 7 F
Q 0 E
Q 1 D
Q 2
Q 5
Q 4
Q 3
2 S
3 +5 V
1 GN D
COM3
COM2
COM1
3
1 2 3
456
78
AT 2 4 C0 2
R28 4.7K
R29 4.7K
GND
+5
+5
20S
FMO
CN
C22
104/275
L 2
JL C0301
L 3
JL C0301U2
IC7
10
R35
4.7K12
19
20
P32
P33
CN M
E 2
220UF/35V
C2
104
JS2-B38aC-M15A/0
+5
R38
10K
GND
Q 8
9 0 1 2
R39
10K
R34
2K
E 81uF/50V
C28102
GND
8.265 Mitsubishi main chip schematic diagram
17
1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
D1 -D 4
E1
4 7 0 uF/3 5 V
FU SE
2 5 0 V/3 .1 5 A
S1
B
C1
1 0 4
C2
1 0 4
Vin1
GN
D
2
Vout3
IC 6
7 8 0 5 +5
C2 2
0 .1 uf/27 5 V
S2
2 0 S
FMO
R2 5
1 0 0 /1 W
C2 1
0 .1 UF/27 5 V
E2
2 2 0 UF/2 5 V
E6
2 2 UF/25 V
P1 0
P3 2
P3 3
P3 4
P0 0
P1 3
P0 2
P1 2
P0 1
P0 5
P0 4
P0 6
P0 7
P0 3
1 0 A- 1 8 0 - 6 2 1
I C1
CNCCNB
M3 7 54 4 G2 ASP
3 1
2 6
3 0
2 9
1 9
2 0
2 1
2
2 3
2 5
1
2 4
2 8
2 7
L1
R7
1 0 K
R6
4 .7 K
GND
T1
C31 0 4
C1 2 1 0 4GND
BCN M1 CN M2
+12
X2 A
5 2 CA
5 2 X6 A
X1 A
X5 A
X3 A
X4 A
B
E3
1 0 0 UF/2 5 V
5 2 CB
5 2 X6 B
X1 B
X2 B
X5 B
X4 B
X3 B
CN U
CFO
3 .5 UF/50 0 V
CN 1
C2 0
1 0 4
E8
1 0 0 uf/25 V
Vc c1 3
GND
P3 1
P3 7
1 8
2 2
R1 6
4 .7 K
R1 8
4 .7 K
R1 7
4 .3 K
R1 9
4 .3 KC1 6
1 0 4
C1 4
1 0 4
+5P2 5 / AN5
P2 4 / AN48
9
GND
GND
CN G1
tTR
tTP
R2 4
1 0 K
R2 5 4 .7 k
SW1
C1 9
1 0 4
P2 3 / AN3
P2 1
7
4
5
P2 0
AR 5
GND
GND
+5
C6
1 0 2
E4
1 0 0 UF/2 5 V
IN 11
IN 22
IN 33
IN 44
IN 55
IN 66
IN 77
COM8
CLAMP9
OUT 710
OUT 611
OUT 512
OUT 413
OUT 314
OUT 215
OUT 116
IC 32 0 0 3
710
89
IC 2 G
611IC 2 F
512IC 2 E
413
IC 2 D
314
IC 2 C
215
IC 2 B
116
IC 2 A
2 0 0 3
FU SE+ZR
GND+5
C1 31 0 4
C1 51 0 4
GND
GND
E71 0 UF
GND
+5
NC
CN
B
CN1 2 0
COM
1
6
4
3
2
6
7
8
1 0Vr e f
Vs s1 6
BZ2 KR14
P3 01 7
25v
4007
L
C1 81 0 3
IC 4
IC 5
D6
IN 4 0 0 7
R2 3
2 0 0 K/2 W
R2 2
2 0 0 K/2 W
1 0 K
C1 71 0 3 D5
IN 4 0 0 7
FE ED
DE FR OSTE R
GND
GNDR2 1
1 0 K
+5V
DA 1
DA 2
DA 3
DA 4
AR 5
()
4.7K
103
GND
390390
GND +5V
Q2
9012
Q3
9012
Q4
9012
4.7K
4.7K
4.7K
+5V
+5V
+5V
102
102
102
GND
GND
GND
CLK
DATA
COM 1
COM 2
COM 3
COM 1
COM 2
P2 2 / AN2 6
C51 0 2
GND
R1
51 /2W
R5 R4
R3
R2
C7
R12
C8
C9
R20
C10
R13
C2 1
1 0 4
CN1
E 10
22UF/25VC22
104
+5
(37544) 65/
XL 1
8 M
R3 0
3 0 0 K
GND
Xi n
Xo ut
1 4
1 5
GND
+5
R3 32 K
1 1
RESET
E1 0
4 .7 uF/5 0 v
A01
A12
A23
GND4
SDA5
SCL6
WP7
VCC8
IC 8
2 4 C0 2
GND
4.7K4.7K
R28
+5
3 2
P1 1
P1 43
E5
1 0 0 uf/25 V****************
C4
1 0 4****************
Q1
9012
R3 21 0 K
R3 1
1 0 K
R3 4
5 1 0
R29
R M T _IN
P 11 P 10
R8
4 .7 K
R9
4 .7 K
DA 5
IN 4 1 4 8
DA 6
IN 4 1 4 8****************
DA 4
IN 4 1 4 8
DA 3
IN 4 1 4 8
P21P07
R1 0
4 .7 K
R1 1
4 .7 K
GND
DA 2
IN 4 1 4 8
DA 1
IN 4 1 4 8
P20
R2 7
4 .7 K
R2 6
4 .7 K
JS2-B65aC-M11A/0
R3 5
4 .7 K
R3 6
4 .3 K
C2 4
1 0 4
+5
2
C2 3
1 0 4
GND
t
TP2
GND
CNG2
AA AA
DA 5
T YPE _IN1
T YPE _IN2
GND
CNVs s 1 2
R3 7
4 .7 K****************
GND
8.385 section of schematic diagrams
1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
E 2
220UF/25V
E 1
1000UF/35V
C30
104C25
104
+5
FUSE
3.15A 250V
IN 4 0 0 7D1 --D 4
ZR
621-10-126
T RANSCN B
Vin1
GN
D
2
OUT3
IC5 7 8 0 5
CN C
GND
X5B
B
U1
BNO
B
FMC
CM
12
CN1
U
U
S
FMO
1
4
2
3
L
EF- 1 0 05 G
C1
104/275V
C2
104/275V
IC2
D5
IN 4 0 0 7
5 2 C12 V
5 2 X6
9 5 3 -1 A
NO COMHE AT
COM
U
B
2 0 S
5 2 X5 AU1
5 2 X4 A
R3
3 3 0
+5V
1
2
4
6
IC4
BT 131
R4 6
3 9 0
L 3
U1
C3 1 0 4 / 2 75 V
CFI
1 . 2 UF / 4 5 0 VAC R1
2 2 0 IW
C3 5
4 7 3 / 2 75 V
MF1
N1
Z
5
1
R27 10K
R26 10K
R3 0
4 .3 K
R3 1
4 .3 K
C21C20
GND
GND
GND
1 0 4 1 0 4
CNG
+5V
E 8
100UF/25V
C31104
GND
GND
+5
1
4
5VD D
VSS
TE ST
R32
10k
R25 4.7k
C19
102
GND
C15
102
GND
+5
3
2
1
CNM +5
GND
R42 10K2 2P1 0
C24102
GND
Q2
1815
GND
R10
4.7K
+5
ZR9 10K
C27
103
R8
4.7K
GND
RX
300K
GND
XL8M
2XI N
XOUT 3
R4 3
1 0 K
E7 4 .7 UF/50 V
D6IN 4 1 4 8
+5
GND
SW1
R2 4
4 . 7 kGND
8RE SET
GND
R28 10K
R2 9
4 .3 K
GND
+5V12
CNP
2
C22
104
C18
104
R1 3
1 0 k
+5V
C7102
GND
R19220*3
R17
C14
102
R20220
GND
R4 4
4 .7 k
R23
R22
+5
GND
D8
4 1 4 8
D1 2
4 1 4 8
D1 0
4 1 4 8
E 9
22UF/16V
C33
104
+5
C28
102
GND
CNE
C13
102
C12
102
C11
102
GND
1
2
3
4
5
6
R15 R18
10k*5
R14 R16
C9
102
R21 220
+5
GND
A01
A12
A23
GND4
SDA5
SCL6
WP7
VCC8
IC5 24C02
GND
+5VE6
1 0 0 uF / 2 5 V
R11
4.7k*2
R12
+5
C10
102
C8
102
GND
R7 5 1
R6 5 1
CL OC K
DA TA 1
2
345
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
G N D
R4
4.7K
R5
4.7K
Q1
9013
M7 4 H5 9 5
RC K
VC C
SCL R
GN D
G
SISCK
Q H*
Q H
Q G
Q F
Q E
Q D
Q C
Q B
Q A
IC 1 3
G N D
+5
+5
IN 11
IN 22
IN 33
IN 44
IN 55
IN 66
IN 77
COM8
CLAMP9
OUT 710
OUT 611
OUT 512
OUT 413
OUT 314
OUT 215
OUT 116
IC15 2003
CNM1
CNM2
IN 11
IN 22
IN 33
IN 44
IN 55
IN 66
IN 77
COM8
CLAMP9
OUT 710
OUT 611
OUT 512
OUT 413
OUT 314
OUT 215
OUT 116
IC16
2003
GND
B
R394.7K
R34
R40
R35
R37
R38
R36
R4110K
+5
GND
CNM
BZ
GND
52X6A
X1A
X2A
52CA
IN 11
IN 22
IN 33
IN 44
IN 55
IN 66
IN 77
COM8
CLAMP9
OUT 710
OUT 611
OUT 512
OUT 413
OUT 314
OUT 215
OUT 116
IC14 2003
B
B
R3 3
2 K
H F 2 16 0-1A -1 2D E
X5A
P1 1 2 3
B
GND
P1 2 2 4
C32
102
GND
C17
104 C16104
C26 102
CN A
S1
S1
R2
2 2 0 IW
C1
47
3/
27
5V
X 5B
U1
1 7
1 5
1 6
1 8
2 5
3 2
3 1
3 0
9
1 1
1 2
1 3
1 0
2 9
2 8
2 6
2 1
2 0
1 9
7
6
2 7
1 4
D7
4 1 4 8
D1 1
4 1 4 8
D9
4 1 4 8R4 5
4 .7 k
+5
C29
102
GND
E3 1 0 0 UF/2 5 V
E4
1 0 0 UF/2 5 VC5 104
B
B BE5
4 7 UF/25 V
+5
C34
102
C23 104
GND
CNL
R47 4.7k
IC1 T MP86F809NG
E 9
22UF/16V
C6 104
C36
104
C37
104
M70 80985
JS2-B85aC-T01A/0
8.4Three water chestnut 18NV 85 section of entire compatible electrically controlled schematic diagrams
18
1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
VALVE
EFAN
CF
LO
MI D
HI
N
CFI
52 CB
X4 B
X3 B
X2 B
X1 B
52 X6 B
X5 B
COM
COM
CN
CN
L
HEAT
CM
FMC
MF1
U1
2 6 P0 3
2 7 P0 4
2 8 P0 5
2 0 P3 3
1 8 P3 1
1 7 P3 0
1 9 P3 2
52 CB
X1 B
X5 B
X4 B
13 4
I C3E
20 03
15 2
I C3C
20 03
14 3
I C3D
20 03
CNH
52 X6 B
X3 B
16 1
I C3B
UL 20 03
X2 B
B
P1 1 3 2
3 P1 4 / CNTR0
P3 4 2 1
P3 7 2 2
1 1 / RESET
XL
8. 00
R4 1
30 0K
1 5
1 4 Xi n
Xo ut
GND
SW1
8 P2 4 / AN
9 P2 5 / AN
R1 2
4. 3K
R1 3
4. 3K
t
t
R1 4
39 0
R1 5
39 0
C1 0
10 4
C1 1
10 4
C9
10 4
C8
10 4
GND
GND
+5
2
1
3
4
CNG
2 P1 3
P1 2 1
R2 2
10 k
+5
R2 3
10 k
GND
1 2 CNVs sR2 4. 7K
GND
Vs s 1 6
C N 13 3
P2 0 / AN 4
P2 1 / AN 5
P2 2 / AN 6
13 4
I C4E
20 03
15 2
I C4C
20 03
14 3
I C4D
20 03
BZ
7 P2 3
B
E6
22 uf / 2 5V
GND
3
2
GND
1
1
2
3
1
2
3
4
5
CN1 6 1
CN -AC
CN12
C 5
104
GND
R 3 51 0
IC1
1 2 3
456
78
A T2 4C 0 2
R 40
4.7K
R 39
4.7K
GND
+5+5 IC5
E8
4.7u f/2 5F
10 0 R34
10 0 R35
B
GND
R 5
2K
10 0R6
22 0R7
10 0u F/25V
E 7
GND
A 10 15
Q3
+12V
4.7KR8
M3
75
44
G2
SP
SCL
SDA
Vc c 1 3
C1 2
10 4
E5
10 uf / 1 6v
GND
Vr e f 1 0+5V
611IC4F
512IC4E
2003
AJ1
Q7
90 12
R4610K
R44
2K
R45
10K
P0 2 2 5
P0 1 2 4
P0 0 2 3
P0 7 3 0
P1 0 3 1 R3 2
4 .7 K
R3 3
4 .7 K
D6 4 1 4 8 D8 4 1 4 8 D1 0 4 1 4 8
+5
D7 4 1 4 8 D9 4 1 4 8 D1 1 4 1 4 8
R9 2 2 0
R1 0 2 2 0
8
9
GND
AA
BB
AA
BB
4
5
6
CN 1 2 3
+5V
ST B
HS0 0 3 8
E2
2 2 UF/16 V
+-
S
1
2
3
RMT
R1 5 1
2 S
1 +5 V
3 GN D
+5V
1u F/50 V
E 10
GND
10 0 R36
C2 2
10 2
C2 3
10 2
C2 4
10 2
GND
C6104
R4
4.7KR114.3K
C7104
1
2
CNG2
2
+5V
GND
C2 0 10 4
E9
22 Uf / 5 0V
TRANS
D1 - D4
4 0 0 1
E1
1 0 0 0 UF/ 3 5 V
E3
4 7 0 UF/ 2 5 V
C1
1 0 4
C3
1 0 4
Vin1
GN
D
2
OUT3
I C4
7 8 0 5
GND
2
3
1
4
L 1
AC- N
C1 2
1 0 4 / 2 75
FUSE
ON
B +5
FUSE+ ZR L
U1
IC1
C2
104E1
4 7 0 UF/ 5 0 V
C10
102
C8
102
R4 7 5 1
R4 6 5 1
CL OC KDA TA
8
1 1
1 3
1 4
R44
4.7K
R45
4.7K
Q6
9013
M7 4 H5 9 5
RC K 1 2
VC C 1 6
SCL R 1 0
GN D
G
SISCK
Q H* 9
Q H 7
Q G 6
Q F 5Q E 4
Q D 3Q C 2
Q B 1Q A 1 5
IC 3
GND
GND
+5V
+5V
E4
4 7 UF/16 VGND
+5V
B
E7
22 uf / 2 5V
GND
1
2
3
4
5
CNM
IN 11
IN 22
IN 33
IN 44
IN 55
IN 66
IN 77
COM8
CLAM P9
OUT 710
OUT 611
OUT 512
OUT 413
OUT 314
OUT 215
OUT 116
IC6
2003
GNDC4
104B
IN 11
IN 22
IN 33
IN 44
IN 55
IN 66
IN 77
COM8
CLAM P9
OUT 710
OUT 611
OUT 512
OUT 413
OUT 314
OUT 215
OUT 116
IC7
2003
GNDC5
104B
JS2-B85AC-M01A/0
3754418NV P85
8.5Mitsubishi Jin dynasty 85 model of simple three lamp electrically controlled motherboards
1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
CN C
D1 -D 4
IN 4 0 0 7
Vin1
GN
D
2
OUT3
IC 8 7 8 0 5
T
E1 0
1 0 0 0 UF/3 5 V
E1 1
2 2 0 UF/2 5 V
C41 0 4
C6
1 0 4
X2 A
X1 A
GND
+5B
CN B
FMC
CM
L
N
FU SE
F3 .1 5 A 2 5 0 V ACU1
N 1
M C 20 03
B
B
1
4
5
6
7
2
16
13
12
11
10
15
GND
X1 B
X2 B
5 2 X6 B
5 2 CB
9
30P07
P3421
C9 1 0 4E44 7 uF/2 5 V
B
C31 0 4 /2 75 V AC
+5
C2 61 0 4
C2 11 0 4
R1 7
4 .3 K
R1 1 0 K
C2 41 0 4
R3 2
4 .3 k
R1 4 1 0 K
C2 01 0 4
TEMP
Tp
Tr
34
21 P20
P21
4
5
CNG
D1 2
IN 4 0 0 7
AC.ZERO
XL
8 .0 0RX
3 0 0 K
R3 0
1 0 K
R2 0 2 K
C2 5
1 0 3
R3
1 0 K
+5
R2 7
1 0 K
Q 1C1 8 1 5
R1 6 4 .7 K
R4
1 0 K
R2
1 0 K
+5
C1 3
1 0 2
R3 1 4 .7 K
14
15
AC..ZERO
32
1
INT10
CNTR0
Xout
Xin
Vcc13
22
3
P37
P1416
Vss
29 P06
CNW
+5
C1 71 0 4
GNDGND
GND
GNDGND
GND
GND
GND
GND
GNDGND GND
P23 7
HSTP.0 R84 .7 K
R94 .7 K
D1 5 4 1 4 8 D1 2 4 1 4 8 D1 3 4 1 4 8
R6 2 2 0
R1 0 2 2 0
R1 1 2 2 0
+5
P02
P33
25
19
P1031
P0326
2
heat/cool
dhon/offHSTP.1
D7 4 1 4 8 D1 4 4 1 4 8 D9 4 1 4 8
TYPE1.0 /
/ TYPE1.1
P22
9
8
23
P25
P24
P00
P12 1
R2 4
3 9 0
IC 9
BC R
R2 5 3 3 0
R2 62 2 0
C1
4 7 3 /2 75 V
P32
20
L1
CFI
1 .2 uF
N
C21 0 4 /2 75 V U1
CNU
1
5
3
3
21
C1 0
1 0 2
GND
5 2 C-1 A
5 2 X6 A
COM
CN
COM
GND
H E A T
U1
/RESET11R3 3 5 1 0
GND
+5
GND
CS
1 2 3
4
5
6 7
8
AT 2 4 C0 2
R3 7 4 .7 K
R1 8 4 .7 K
GND
+5
+5
IC7
E5
4 7 uf/2 5V
0C314
IC1
IC3
1
2
4
6
IC 4
MC3 0 2 1
+5
DI
WR
+5
E1
1 0 0 uF/1 6 V
GND
12
4 .7 KR3 5
GND
P31
P3017
18
R3 4
2 K
24P01
GND
CNVSS
10 VRE F
ZR 6 2 1 -1 0-1 2 6
BZ
20 S
F M O
C1 81 0 2
GND
D8 4 1 4 8
R1 2
4 .7 K
+5
123456
CNE
XH-6A+5
GNDS
S
C1 9
1 0 4
R2 1
4 .3 K
R2 9 1 0 K
GNDGND
12
CN1
XH-2A
+5C23
104
GND
C12
102
C16
102C8
102
GND
6
C7
1 0 4
Q 3
9 0 1 2
R23
R36
R19
E 3
+5
1uf/50V
10K
10K
2K
E 2
C2 91 0 4
100F/25V
D1 1 4 1 4 8 D1 0 4 1 4 8
GND
C1 4
1 0 4
C1 1
1 0 2
10 0 R22
10 0 R5
CLK
DATA
QA QB QC QD QE QF QG
QH1 2 3 4 5 6 715
16VCC
GND
SCLR
10
S1
SCK
+5
IC2 M74HC595
C5
1 0 4
GND
G8
13
GNDRCK
R13
4.7K
Q29013GND
12
R7
4.7K
+5C27
471
C28
471
GND
27
28
P04
P05
12345
CNM
IN 11
IN 22
IN 33
IN 44
IN 55
IN 66
IN 77
COM8
CLAMP9
OUT 710
OUT 611
OUT 512
OUT 413
OUT 314
OUT 215
OUT 116
IC5
2003
C15
104
B
B
12345
CNM1
E 6
47UF/25V
B
GND
R1 5
1 0 K
+5
SW1
P1132
C2 2
1 0 2
GND
GND
R2 8
4 .7 K
11
14
GND
+5
P13
QA
QB
QC
QD
QE
QF
QG
0C314
JS2-B85aC-M01A/2
Q49013
D1 6
4 1 4 8
B
R38
4.7K
19
9. PCB function:
NOTE: Ts is the set temperature, Tr is indoor room temperature, TP1 is indoor coil pipe temperature, TP2 is outdoor
coil pipe temperature.
Display panel
[1]only two LED
running lamp(green)power on light, flash one time/ one second during anti cooled wind.
timer lamp(yellow)only light at timer state.
[2]eleven LED
running lamp(green)power on light, flash one time/ one second during anti cooled wind.
temperature lamp(green)1631 set temp. and room temp. display, light is set temp. flash is set temp.
[3]two LED and two 8LED
running lamp(green)power on light, flash one time/ one second during anti cooled wind.
timer lamp(yellow)only light at timer state.
8LED display set temp., also it can display timer time and failure code.
[4]LED multi-colour panel
according to display mode: dehumidification, cooling, ventilation, heating, auto, sleep, fan speed, swing, timer, indoor
fan running.
running timer
20
Cooling
Start up the compressor: when the room temperature is more than Ts+1, compressor start-up
Shut down the compressor: when the room temperature is less than or equal to the set temperature Ts-1,
compressor shutdown
When the temperature of coil pipe of the indoor units is less than or equal to 1 for one minute and the
compressor has continuous run for more than ten minutes, the compressor and outdoor blower fan shut down
through the electric control board and the indoor blower fan is running at low speed.
When the temperature of coil pipe of the indoor units is more than or equal to 7 and the compressor has
shutdown for more than three minutes, the compressor and outdoor blower fan start to run and the indoor blower
fan is running at set speed.
When the temperature of coil pipe of the indoor units is equal to or less than 10 for three minutes in the
compressor has continuous run for three minutes, the compressor, indoor and outdoor blower fans and swinging
wind shut down. Restart up six minutes later; if the above situations appear again within six minutes, all the
outputs are shut down through the electric control board and display failure.
When you press turbo button of remote, the air conditioner enter turbo running, compressor and outdoor blower
fan turn on all along, indoor blower fan run at high speed, turbo indication is light.
After the compressor runs five minutes, the lamp flashes 4 times per six seconds or display E4 if the temperature
of indoor coil pips is more than 25 in the continuous 20 minutes. The controller will automatically shut down if
the temperature of indoor coil pips is more than 25 in another continuous 20 minutes, that is the abnormality
protection of outdoor units and the indicator lamp keeps its former state of flashing. If the temperature of indoor
coil pips is less than 25 in the second 20 minutes or the compressor shuts down, the electric control board will
store to the normal display and the time is restarted when starting up the compressor next time.
21
1 C
7 C
Tr
-10 C
compr essor
out door
bl ower f an
door
bl ower f an
compr essor
door
bl ower f an
Tr
Heating (only applicable to heat pump units)
Start up the compressor: when the room temperature is less than Ts-1, compressor start-up
Shut down the compressor: when the room temperature is more than or equal to the set temperature Ts+3,
22
compressor shutdown
The electric heating start-up in the heating mode shall meet the following conditions: start up the compressor
and indoor blower fan none defrost TP1< 49 Tr 20.
The electric heating shutdown in the heating mode shall meet one of the following conditions: shutdown
indoor blower fan Tr 23 TP150.
In the heating mode, the indoor flower fan can be set as high/ medium/ low /automatic running mode by remote
control however the anti cool air function is prior. In the heating mode, the anti cool air control function is to
control shutdown of the indoor blower fan by detecting the temperature of coil pipe of evaporator so as to attain
the purpose of preventing cold air from blowing.
For the waste heat emission function in the heating mode, in principle, the indoor blower fan shall be on for
fifteen seconds after the electric heating is closed.
When the temperature of coil pipe of indoor units is more than or equal to 56, the outdoor blower fan shuts
down and it enters the overload protection; when the temperature of coil pipe of indoor units is less than or equal
to 52, the outdoor blower fan starts up and it exit the overload protection.
When the temperature of coil pipe of indoor units rises to 63, the compressor and outdoor blower fan are closed
and two minutes later, the change valve is closed. The indoor blower fan is running at the set speed. Restart up six
minutes later; if the above situations appear again within ten minutes, all the outputs are shut down through the
electric control board and display failure.
When you press turbo button of remote, the air conditioner enter turbo running, compressor ,outdoor blower fan
and four-way valve turn on all along, indoor blower fan run at high speed and it must meet start condition, turbo
indication is light.
After the compressor runs five minutes, the lamp flashes 4 times per six seconds or display E4 if the temperature
of indoor coil pips is less than 30 (heating) in the continuous 20 minutes. The controller will automatically shut
down if the temperature of indoor coil pips is less than 30 in another continuous 20 minutes, that is the
abnormality protection of outdoor units and the indicator lamp keeps its former state of flashing.
23
+3
- 1
COMPRESSOR st ar t - up st ar t - up
out door
bl ower f anst ar t - up st ar t - up st ar t - up
st ar t - up
bl ower f anl ower
speed
l ow
speed
l ow
speedl ower
speed
l ow
speed
st ar t - up2 MIN 2 MINst ar t - up st ar t - up
over 6 MIN
four-way
valve
Tr
door
Tr
24
compr essor
door
bl ower f an
Tr
36
Defrost (only applicable to the heating mode)
1. the intelligent defrost
In the heating mode, the electric control board checks and compares the temperature of indoor room and indoor coil
pipe after the compressor works for a while; judge whether the outdoor heat exchanger part is frosted or not according to
conditions such as the change of indoor coil pipe temperature; if it is judged as frosted, it automatically enters defrosting
process. When defrosting, close the indoor and outdoor blower fan and four-way valve.
2. Outdoor PCB for defrost.
In the heating mode, the unit defrost by outdoor control board
unit start defrost shall all meet the following conditions
acompressor continuous running over 7 minutes
bdefrost relay shut off-5
ccompressor cumulate running time over 50 minutes.
first defrost interval time is 50 minutes, later defrost interval time decided by last defrost time.
Defrost time(minute) Next defrost interval time(minute)
15 30
10--15 40
7--10 60
3--7 70
25
3 80
2end defrost condition(meet one of follows)
adefrost time have fifteen minutes.
bdefrost relay turn on8
cpress ON/OFF key in defrost process.
3. Outdoor sensor for defrost
unit start defrost shall meet one of the following conditions
a. compressor cumulate running time over 30 minutes and it continuous running over 3 minutes, the
temperature of coil pipe of the outdoor units is equal to or less than 15 for one minutes (Tp2-15).
b. compressor cumulate running time over 40 minutes and it continuous running over 3 minutes, the
temperature of coil pipe of the outdoor units is equal to or less than 5 for one minutes (Tp2-15).
c. Air conditioner first power on or it wait over 30 minutes ,the temperature of coil pipe of the outdoor units is
equal to or less than 2 (Tp2-15)
end defrost condition(meet one of follows)
a. the temperature of coil pipe of the outdoor units is more than 15 (Tp2-15).
b. defrost time have fifteen minutes.
compr essor
out door
bl ower f an
door
bl ower f an
TP2
Tr
26
compr essor
out door
bl ower f an
door
bl ower f an
TP2
Tr
Tr
compr essor
out door
bl ower f an
door
bl ower f an
TP2
27
out door
bl ower f an
door
bl ower f an
TP2
defrost time over 15 MIN or TP2 >15 C
Tr
compr essor
Sequence chart in defrosting mode
end def r ost
st ar t - up shut down st ar t - up shut down st ar t - up
st ar t - upst ar t - up shut down
def r ost
our - way val ve
door
bl ower f an
st ar t - upst ar t - up
st ar t - up st ar t - up
shut down
shut down
out door
bl ower f an
compr essor
st ar t def r ost
Dehumidification
Dehumidification running is to eliminate the water vapor in the air by using the cool circulating capacity, but the
dehumidification will not decrease the indoor temperature in great deal. The air conditioner automatically repeats on
and off circulation according the room temperature, which is shown in the following figure.
28
i ndoor
bl ower f an
C
C
door
bl ower f an
Tr
shut down shut downshut down shut down shut down
shut downshut downshut downshut downshut down
l ow speed
Tr 10
shut down
st ar t - up
st ar t - up st ar t - up
st ar t - up st ar t - up
st ar t - up st ar t - up
st ar t - up
f or bi d
dehumi di f y
In the dehumidification mode, the indoor fan is running at the low speed for twenty seconds at first, then it select
working mode.
Ventilation working mode (only applicable to single cooling unit)
In the ventilation mode.When ventilating, the compressor, outdoor blower fan, four-way valve and electric heating are
all closed and the indoor blower fan is running at the set speed.
compr essor
out door bl ower f an
door
bl ower f an
Tr
Automatic mode
Conditions for entering the automatic running mode are: After power-up for the first time, start up and select the
automatic operating mode of remote or press emergency key, the working mode depends on Tr and if the working
29
mode had set , it doesnt change by Tr and the default set temperature is 25 .
25
Tr
21
26 C
mode
Time on and time off
When the time on or time off is used, the clock of remote controller shall be corresponding to the current clock and the
timing times is less than or equal to 24 hours, when the timing time is reached, unit will start-up or shutdown.
Sleep function When the sleep key is press, air conditionerenter sleep state, indoorblower fan running at low speed, only sleep
indication display.
Emergency key function
There is a forcible execution key on the panel of indoor units and the air conditioner can run by pressing the key when
the remote control is out of work or missing.
When pressing down the forcible execution key, then power up and enter the self-check program.
Failure display
LED lamp display
failure The reason of fault and solution
code explain code explain
DF display at flicker 1/1 defrost Normal, the defrost state is removed, it will return to
normal condition automatically
30
on state SEC indication
display at
off state
flicker 1/3
SEC
anti cold wind
1 Normal (during heating mode )
2It will be removed when the coil pipe temperature
sensor reaches certain temperature.
E2
display at
off state
flicker 1/1
SEC
display at
on/off
state
room temp.
sensor fault
1Check whether the resistance of the sensor is normal
(the resistance is 5 in the normal temperature
25), when it is abnormal the sensor should be
replaced.
2Check whether there is short circuit or open circuit in
the wire of the sensor, and whether the plug is
connected well, whether there is welding off or
rosin joint on the electric control board, if there is
any, it should be repaired.
3When the 1 and 2 are both normal, then the
components or integrated circuit is damaged, the
electric control board should be replaced.
E3
display at
off state
flicker 3/5
SEC
display at
on/off
state
coil temp.
sensor fault
1Check whether the resistance of the sensor is normal
(the resistance is 5 in the normal temperature
25), when it is abnormal the sensor should be
replaced.
2Check whether there is short circuit or open circuit in
the wire of the sensor, and whether the plug is
connected well, whether there is welding off or
rosin joint on the electric control board, if there is
any, it should be repaired.
3When the 1 and 2 are both normal, then the
components or integrated circuit is damaged, the
electric control board should be replaced.
E4
display at
on/off state
flicker 4/6
SEC
display at
off state
outdoor unit
abnormal
1 Check whether the winding resistance and
operation current of the compressor are normal.
2Check whether the high and low pressure is normal
when the unit is running.
3Check (whether the coil pipe sensor is normal)
whether the contact of the inserter on the circuit
board is well, the coil pipe temperature sensor is
fixed, the evaporation of the indoor unit is well,
31
the key is to check the evaporator temperature
detected by the coil pipe temperature sensor has
reached the cooling or heating temperature.
4Check whether the surface of the condenser is too
dirty, it should be cleaned when it is too dirty.
5Check whether the capacitance of the outdoor motor
and the fan is damaged, it should be replaced when
it is damaged.
6If the above items are normal, the electric control
board should be replaced.
E5
PG motor
display at
off state
flicker 5/7
SEC
display at
off state
no feedback
signal of indoor
fan
1Check whether two sets of plugs on the outlet end of
the motor have loosed from the socket of the
electric control board, insert it firmly when loosing.
2Check whether the indoor motor has damaged, the
motor should be replaced when it is damaged
3 Check whether the controllable silicon and other
components on the electric control board have
damaged, replace the controllable silicon or electric
control board when they are damaged.
E6
PG motor
display at
off state
flicker 6/8
SEC
display at
off state
no over zero
signal
1Firstly check whether the indoor fan is normal.
2Check whether the signal outputting from the
integrated chip of the electric control board is
normal, the electric control board should be
replaced when the signal is abnormal.
E7
display at
off state
flicker 7/9
SEC
display at
off state
outdoor
feedback fault
1Check whether the winding resistance and operation
current of the compressor are normal
2Check whether the high and low pressure is normal
when the unit is running.
3Check whether the indoor and outdoor wiring is
right; when it is wrong, connect them again
according to the circuit diagram
4 Check whether the contact of the inserter on the
circuit board and the connection are well, otherwise
repair.
5Check whether the signal feedback wire is
32
disconnected, replace or connect the feedback
signal wire.
6Check whether the supply power is phase-lacking or
phase opposition.
7Check whether the AC electromagnetic contactor is
well.
E8
display at
off state
flicker 8/10
SEC
display at
off state
frost
protection/over
heat protection
1Check whether the filter of the indoor unit is dirty or
blocked, and clean if it is dirty.
2Check whether the indoor fan is running normally,
and replace the motor if it is abnormal.
3Check whether indoor pipe temperature sensor is
normal, and replace the sensor if it is abnormal.
4Check whether the system pressure is normal, if
abnormal, should check whether there is leakage,
and fill the refrigerant again.
33
10. TROUBLE SHOOTING
Is CN (Tr sensor connector)
connected properly?
Is Tr sensor resistance value
(5KO at 25? ) normal?
Indoor P. C. board is defective. Replace P. C. board.
Connect CN properly.
Replace TA sensor.
Is CN (TP1 sensor connector)
connected properly?
Is TP1 sensor resistance value
(5KO at 25? ) normal?
Indoor P. C. board is defective. Replace P. C. board.
Connect CN properly.
Replace TC sensor.
YES
YES
YES
YES
NO
NO
NO
NO
Indoor Tr sensor
error
Indoor TP1 sensor
error
34
Turn off power
supply once, and
turn it on again.
Does
compressor
continue to
operate?
Start to operate indoor
unit in cooling
operation at airflow
level LOW ,wait
three minutes..
Does indoor
fan operate?
Fan motor
operates
normally.
Is it possible to detect AC
220V between
pin(high/middle/low) and
pin(common) of motor
connector .
Replace indoor
fan motor.
Replace main
P.C. board.
Replace
bearing.
YES
YES
YES
NO
NO
NO
Turn off indoor unit and rotate
cross-flow fan by hand when the
unit is on standby.Is it possible to
rotate cross-flow fan by hand
properly?
Only indoor fan motor does not operate.
Is capacitor of indoor fan ok?
YES
NO
YES
Replace
capacitor
NO
(1) Is it possible to detect the power supply voltage (200-240V) between L and N on the terminal
block?
(2) Does the indoor fan motor operate in cooling operation?
35
Compressor does not operate.
Turn on power supply.
Does compressor delay
three minutes by
temperature changes or
others?
Does OPERATION
indication indicate?
Is it possible to detect AC
220-240V on terminal
block or contactor of
compressor?
Are all of compressor
cords normal?
Is compressor motor
winding normal?(Check
winding resistor.)
Is capacitor for
compressor normal?
Is overload relay normal?
Does compressor start?
Does compressor stop
after a while?
Is gas quantity normal?
(Check gas pressure.)
Microcontroller is defective or
miniature relay is defective..
Is resistance value of room
sensor (Tr) and heat exchanger
sensor (TP1) normal?
Room sensor or heat
exchanger sensor is
defective.
Replace room sensor
or heat exchanger
sensor.
Compressor is defective.
Capacitor is defective.
Overload relay is defective.
Compressor is defective.
Gas shortage (Gas leak)
Compressor is defective.
Replace P.C. board.
Rewire or replace
defective cords.
Replace compressor.
Replace capacitor.
Replace overload
relay.
Supply gas.
Replace compressor.
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO NO
NO
NO
NO
NO
NO
NO
NO
Check power supply.
Replace compressor.
Wait three minutes
(1) Is the room temperature higher than the preset temperature in cooling operation?
(2) Is the crossover cable connected properly?
36
Replace
P.C. board.
Is receiver on
indoor unit exposed
to direct sunlight?
Batteries are
exhausted.
Press START/STOP
button.
Is there any thyristor
fluorescent light
nearby?
Does indoor unit
operate when
moving remote
control near receiver
or indoor unit?
P.C. board is
defective.
Is transmission
mark indicated?
Press RST button
on remote control
with tip of pencil.
Press START/STOP
button.
Does radio sound is
affected by remote
control when a
signal is transmitted
at distance of 5 cm
from radio?
Does indoor unit
start to operate by
automatic restart
function?
Is transmission
mark indicated?
Does indoor unit
beep and operate?
Remote control is
defective.
Keep indoor unit
away from
thyristor
fluorescent light.
Avoid direct
sunlight.
Replace
batteries.
Normal
operation
Replace remote
control.
The unit does not beep at all.
OPERATION indication on
indoor unit is not indicated.
NONO
NONO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
YES
37
Trouble
Is the power
applied to the unit?
Check power supply mains or
interconnection wires
Is the power normal? check
the voltage between L&N of
terminal block
Check the wiring of indoor and
outdoor
Press the power ON/OFF button
of wire control or remote control
YES
YES
NO
NO
Does the beeper
beep?
Is the display all
off?
Check the connector on display
PCB connected to control PCB
Check the display PCB itself
Is the unit display
normal?
Does outdoor unit run?
Does the
compressor run
normally?
Check the failure code
according to the failure
table
Normal
Check the
compressor ,wires
and it s
capacitor.
YES
YES
YES
YES
YES
YES
NO
NO
NO
Does the control
ok?
Does the control
PCB ok?
Control failure
Control PCB failure
NO
NO
YES
NO
Trouble shooting
NO
Does the indoor
unit run?
38
Indoor unit and outdoor unit don t operate
Indoor and outdoor unit
don t operate
Press emergency key, does
the air conditioner
running?
Replace fuse of
indoor PCB.
YES
YES
YES
NO
NO
NO
NO
Make the power
supply ok.
Replace remote
control.
YES
NO
Replace remote
receiver or display
panel.
NO
YES
YES
Replace transformer.Does the transformer has
output?
Does the fuse of indoor
PCB burn out?
Change a good remote,
does the air conditioner
running?
Is the power supply no
problem?
Does the 12V and 5V of
indoor PCB have?Replace PCB.
normal
Does the electric switch
cut off?
Does the electric switch
cut off after a few
nimutes?
Is the wires of indoor
unit and outdoor unit no
problem?
YES
Reconnect the wires.NO
Is the insulation of
indoor unit and outdoor
unit no problem?
YES
Find the reason and
replace the failure
componet.
NO
Is the resistance of each
main component no
problem?
Rreplace the failure
componet.
NO
YES
YES
YES
39
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