599090 Diagnostics 920 DW.pdf

SOFT TOUCH DISHWASHERMODELS

DW820 DW920

599090Fisher & Paykel Appliances © 2003 July 2003

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GENERAL SPECIFICATIONSDimensionsWidth 590mmDepth 555mmHeight 825 - 875mmDoor Open 590mm

Electrical230/240V AC 50Hz 8 amp max.

Heating ElementCalrod type 230/240V AC 50Hz230V AC - 1500 watt240V AC - 1625 wattDC Resistance reading 35 ohms

Combined Rinse Aid / Detergent DispenserRinse AidELTEK 230-240V 50HzRinse Aid Volume 130ccDosage 1 - 6ccDetergentIntermittent Duty CoilDetergent CapacityMaximum Capacity 40 grams

Temperature Sensor (PTC)2000 ohms at 25°C (room temperature)

Electronic PCB Board Assy - 818 & 918Manufactured by Fisher & Paykel Electronics

Water Inlet ValveELBI 230/240V AC 50Hz CoilElectrically actuated diaphragm type with built-in filter supplied with 5litres/min flow regulator.DC resistance readings: 3.6 – 4.2 K ohms

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Drain PumpHANNING DPS 25-019 Pump 20 litres/min at Head = 1mDC resistance reading: 135 ohms

MicroswitchSingle Pole double throw 250V AC 50Hz 10 amp

Flood MicroswitchEMZ 38.0060.1250V AC 50 Hz 2 amp

Overheat Thermostat230/240V AC 50Hz 25 ampOverheat ThermostatOpen 85°CClose 50°C

Wash PumpHANNING PSK12-110 230/240 V AC 50Hz 220 wattPump 95 litres/minHead 4mDC Resistance Reading between motor terminals� 1 & 2 = 38 ohms + 10%� 1 & 5 = 88 ohms + 10%� 2 & 5 = 125 ohms + 10%

Capacitor4uF, 400v AC

FinishTub, internal plumbing, bottom spray arm, inner door - stainless steel.Baskets - nylon coated wire rod.Cabinet, outer door, front panels - pre-painted white hi-bake acrylic over zinc-coated steel.Top spray arm – plastic.

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FAULT DIAGNOSTIC CHART FOR DW920 ANDDW820*

(* DW820 has no L.C.D. display. The illuminated L.E.D.s will indicate thediagnostics and fault finding codes.)

The fault diagnostics consists of 4 stages of diagnostics as follows:

1. Display & LED Test, Current and Previous Fault History and ControllerSoftware Version.

2. Hardware Outputs (HO).3. Permanent Cycle and Cycle Count4. Fast Test Cycle and Dry Test Cycle.

To Enter DiagnosticsPower on at wall socket. No LEDs or displays showing.� Press and hold the ECO SAVE, and then press POWER for 4 seconds.� To move between levels, press WASH.� To move between modes within a level, press START/PAUSE.� To select an option, press ECO.� To exit the diagnostic mode, press POWER.

LEVEL1st Level 2nd Level 3rd Level 4th Level

0 All L.E.D.s on andL.C.D. showing 88

HO PermanentCycle

FastCycle

1 Current Fault Door Switch CycleCount

DryCycle

2 Previous Fault Flood Switch3 Software Version Inlet Valve4 Element5 Wash Pump6 Dispenser7 Drain Pump

MODE

8 Temperature

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On first entering diagnostics, all L.E.D.s will be illuminated and the L.C.D. willdisplay “88”.� Press START/PAUSE. The current fault will be displayed (refer to table

on page 5).� Press START/PAUSE. The previous fault will be displayed.� Press START/PAUSE. The controller software version will be displayed.

Press WASH to enter the second level of diagnostics.� Press START/PAUSE. This enters the door switch test. “8” will be

displayed in the L.C.D. Activating the door switch will show “0” in theL.C.D. and the ECO L.E.D. will illuminate.

� Press START/PAUSE. This enters the flood switch test. “8” will bedisplayed in the L.C.D. Activating the flood switch will show “F” in theL.C.D. and the HEAVY L.E.D. will illuminate.

� Press START/PAUSE. This enters the inlet valve test. “C” will bedisplayed in the L.C.D. and the NORMAL L.E.D. will illuminate.� Press ECO to activate and deactivate the inlet valve.

� Press START/PAUSE. This enters the element test. “E” will bedisplayed in the L.C.D. and the FAST L.E.D. will illuminate.� Press ECO to activate and deactivate the element.

� Press START/PAUSE. This enters the wash pump test. “P1” will bedisplayed in the L.C.D. and the HEAVY and ECO L.E.D.s will illuminate.� Press ECO to activate and deactivate the wash pump.

� Press START/PAUSE. This enters the dispenser test. “dl” will bedisplayed in the L.C.D. and the NORMAL and ECO L.E.D.s willilluminate.� Press ECO to activate and deactivate the dispenser.

� Press START/PAUSE. This enters the drain pump test. “P2” will bedisplayed in the L.C.D. and the FAST and ECO L.E.D.s will illuminate.� Press ECO to activate and deactivate the drain pump.

� Press START/PAUSE. This enters the temperature sensor test. Referto the chart on page 3 for details.

Press WASH to enter the third level of diagnostics.� This enters the permanent cycle. “PC” will be displayed in the L.C.D.

and the HEAVY and FAST L.E.D.s will illuminate.� Press ECO to display the last used cycle. Select the cycle required for

the permanent cycle. Press START/PAUSE to start the permanentcycle. The dishwasher will complete the cycle, then start it over again.

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This will continue until POWER is pressed to exit diagnostics.� Pressing START/PAUSE at any time will pause the cycle, and the

number of cycles the controller has completed in its life will be displayed.Refer to cycle count chart on page 4.

Press WASH to enter the fourth level of diagnostics.� This enters the fast test cycle. “FC” will be displayed in the L.C.D. and

the RINSE and ECO L.E.D.s will illuminate.� Press ECO to activatethe fast test cycle. Press POWER to stop the

fast test wash. During the cycle, pressing ECO will display thetemperature (DW920 only).

� Press START/PAUSE. This enters the dry test cycle. “dC” will bedisplayed in the L.C.D. and the NORMAL and HEAVY L.E.D.s willilluminate.� Press ECO to start the test dry. Press POWER to stop the test dry

cycle and exit diagnostics.Press WASH to return to the first level of diagnostics.

Temperature DisplayDuring the operation of a normal cycle (when not in diagnostics), thetemperature can be displayed on the DW920.

To turn on temperature display:� Activate KEYLOCK.� Press POWER for 4 seconds.� Deactivate KEYLOCK. The temperature read by the temperature sensor

is now displayed on the L.C.D. while normal operations are continued.To turn off temperature display:� Activate KEYLOCK.� Press POWER for 4 seconds.� Activate KEYLOCK.� Press POWER for 4 seconds.

Temperature Sensor L.E.D. ChartIn diagnostics, the temperature is displayed in a binary code, and also on thedisplay (DW920 only). Using the binary codes, the temperature is found byadding together the value of the L.E.D.s that are illuminated.Note: The temperature display only increases in 4 degree steps, i.e. 23oCwould read as 20oC, and the display would not increase until 24oC wasreached.

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L.E.D. Code:L.E.D Value

Eco 4oCRinse 8oCFast 16oCNormal 32oCHeavy 64oC

Example: If the Eco and Fast L.E.D.s were illuminated, the temperaturewould be 20oC.If the Eco and Normal L.E.D.s were illuminated, the temperaturewould be 36oC.

Cycle Count ChartThis is a hexadecimal system used to calculate the number of cycles theelectronic controller has completed. To retrieve the cycle count data, enterthe third level of diagnostics as described on page 2 and 3. The DW820 onlydisplays the cycle counts in segments of 256 cycles by using the L.E.D.s,while the DW920 displays exact cycle counts by using both the L.E.D.s andthe L.C.D. as shown on the following chart.

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For example, on a DW820, if the ECO and RINSE L.E.D.s are lit, 256 + 512 =768. The cycle count is between 768 and 1024 cycles.

Number of cycles (LCD Display DW920 only)

Example (DW920)

Eco

Rinse

Fast

Normal

Heavy

Keylock

256

512

1024

2048

4096

8192

Number of cycles (LED Display)

Normal LED 2048

Rinse LED512

2635TOTAL

64

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SYMBOLSYMBOL TENS COLUMN ONES COLUMN

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16 X 1 = 16

16 X 2 = 32

16 X 3 = 48

16 X 4 = 64

16 X 5 = 80

16 X 6 = 96

16 X 7 = 112

16 X 8 = 128

16 X 9 = 144

16 X 10 = 160

16 X 11 = 176

16 X 12 = 192

16 X 13 = 208

16 X 14 = 224

16 X 15 = 240

TENS COLUMN ONES COLUMN

016 X 0 = 0

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FAULT CODES FOR DW920/DW820DISHWASHER

CodeDW920

Only

LEDDisplayDW920/DW820

Description Possible Causes

U1 RinseOnly

Fill Fault: Themachine fills for 1minute, and ifventilation is notseen in this time, itwashes for 1minute. Ifventilation is still notseen, it drains andrepeats. If at theend of this periodventilation is still notseen, the machinewill flash “U1” andbeep until thePOWER button ispressed.

� Too much foam in themachine.

� Tap for inlet valve is notturned on, or low waterpressure.

� The drain system is notworking or not fast enough.There could be a blockage ora fault in the drain pump.

� The wash pump is notturning on (check indiagnostics).

� The wash pump is faulty.

F1 FastWash

Flood Fault: Theflood switch hasbeen activated bywater lifting the floatin the base pan andthe machine willflash “F1” and beepuntil the power isswitched off at thewall.

� Flood has occurred or switchis faulty.

� The polystyrene float may bejammed up.

� Possible U1 (foaming)� Open circuit in wire to flood

switch.

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CodeDW920

Only

LEDDisplayDW920/DW820

Description Possible Causes

F3 HeavyWash

Over TemperatureFault: Thetemperature sensorreads a temperaturegreater than 90°Cthree times at 10second intervalsand the machinewill flash “F3” andbeep until the poweris switched off atthe wall.

� The incoming water is toohot.

� The machine has becometoo hot.

� The electronic controller isfaulty.

� Temperature sensor orcircuit is faulty.

F4 Eco Save No TemperatureRise Fault: Thedishwasher allows50 minutes after thetimer has paused atthe end of theallocated heatingtime. If it has stillnot reached thesub-cycletemperature, it willflash “F4” and beepuntil the power isswitched off at thewall.

� Element is not connected.� Overheat cutout has tripped.� Element is faulty.� Electronic controller is faulty.� Temperature sensor is not

hard up against the innerdoor.

� Temperature sensor circuithas shorted.

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U1

Foaming

Water valve set up not

correct

Check water inlet, are taps

turned on?

Drain Pump

Wash Pump

Load sensing

Rinse Aid leaking or spilt

Too much egg or protein in

wash

Too much detergent

Locate leak

Clean or neutralise tub

Run on FC until ventilation

occurs

Change set up in software to

suit water supply

Go into diagnostics

& check water valves

Turn taps on

Check that flow rate is more than 2.5l/min

Check coil

Go to Step 4

(Drain Pump)

Check filters & water supply

Check mechanics of

valve

Go into diagnostics & check drain

pump

Check power to drain pump

Check edge connectors &

wiring

Check drain hose for

blockage or kink

Test resistance of drain pump

Check impellor

Go into diagnostics & check wash

pumpCheck impellor for blockage or

slipping Check connectors

& continuity of load sensing wire

Replace electronic controller

Check power to valve

Check edge connectors,

wiring & flood switch wiring

No

YesOK

Not OK

OK

Not OK

Replace valve

Not OK


Repair wiring connections

OK

Not OK

Replace drain pump


Check power to wash pump

Test resistance of

pump

OKOK

Not OK

Step 1

Step 2

Not OK

Step 3

OK

Step 4

Step 5

Step 6

OK

OK

Not OK OK

Not OK

OK

OK

OK

Not OK

OK

Not OK

Not OK

Check labyrinth plate OK

LED displayed, Fill System Problem.

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F1

Water has activated flood

switch

Suck out or drain water from

basepan, then locate leak

Has the switch or polystyrene flood

block been mislocated?

Was leak from overfill

drain?

Look for leak from sump hoses and

pumps

Check the fill level

Check the drain pump and water

valve (5 l/min)

Check spray arms for splits

and correct way up

Was machine

tilted?

Check switch and edge connector

connections

Relocate block


True

No Yes

High OK

False

Yes

No

Rinse base out with clean water to

neutralise caustic effect of wash

powder

LED displayed, Fast Wash.

Yes

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Is the incoming water greater

than 90°C?

Turn down water temperature or fit

hot and safe valve.

Is the element on all the time?

Check wiring


Yes No

Yes

OK


No

LED displayed, Heavy W h

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F4

Run element in diagnostics and

display temperature by pressing Fast

Wash

Does the temperature

display increase?Check the element

resistance

Is the sensor located correctly against the

tub. The temperature has to increase more than 2°C/4min period.

Is the sensor located correctly against the tub?

Does 78°C show in the display constantly?

Locate sensor to correct position

No

NoDoes

element heat?

Yes

Check wiring and sensor edge

connections for open circuit

Does 35°C show in the

display constantly?

Change electronic controller

OK

Yes

NoYes

No

Check wiring and sensor edge

connections for short circuit

Yes

OK

Change over temp

thermostat

Repair wiring

Check over temp

thermostat

Check wiring

Change electronic controller

Change element

OK

OK

Not OK

Not OK

Not OK

Change sensorNot OK

OK

Yes

LED displayed, Eco Save.

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WIRING DIAGRAMSOFT-TOUCH MODEL DW820 – DW920

599090 Diagnostics 920 DW.pdf

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