service manual (template E4)D

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Technical Service Manual

Contents

Specification 2

Function Description 3-4

Water circuit 3-4

Theory of parts 5-23

Location 5

PCB

Inlet valve

Drain pump

6-7

8-10

11-12

Heater

Washing pump

13-14

15-16

Pressure switch

NTC

17

18-19

Flowmeter 20-21

Safety Hose

Diverter valve

Test program

Procedure

22-23

24

25-29

26

Error code 27-29

Inspection 30-33

Troubleshooting 34-38

SAFETY NOTICE

This documentation is only intended for qualified technicians who are aware of the respective safety regulations.

- 1 -

Models: WQP12-J7225

Specifications

Electrical supply 220-240V, 50Hz

Supply water pressure 0.04MPa-1.0MPa

Supply water temperature below 60℃

For the basic operation instructions, please refer to the instruction manual attached with each unit.

- 2 -

Water Circuit

->

Function Description

- 3 -

Water Circuit

->

Function Description

Process of water inlet (indicated by magenta route)

In this process, regeneration water route is cut off, main water route is open. The water in the main water route is softened when pass through the softener, and then enter in the tub. During this phase, some of inlet water will be stored in the air breaker to be regenerating water.

Process of cycle washing (indicated by blue route)

Cycle washing action is driven by washing pump motor. Water can obtain the power during it passing through the working washing pump, then be pumped into spray arm, pass from spray arm nozzles, over the dishes, into sump ,where connect to washing pump, and to get in the next water cycle.

- 4 -

Location

->

Theory of parts

air breaker heater main PCB drain pump softener pressure switch sump washing pump

Please Note: Explode view and part list of each model have some different visions. So please refer to the newest vision Midea sent you

- 5 -

PCB

->

Theory of parts

PCB

Printed Circuit Board is the control center of dishwasher, which receive and process signal from components, send order to components and deal with the feedback information, etc.

Access PCB

Removing the protecting box.

The PCB can be removed from the protecting box in the bottom of machine.

1. Disconnect power supply;

2. Take out cutlery basket, basket and filter system;

3. Open the cover of bottom board.

4. Remove the screws for fixing protecting box and open the protecting box cap.

- 6 protecting box screw

Bottom view

5. Disconnect the connector form PCB.

6. Remove the screws securing the PCB to control panel.

7. Remove the PCB.

8. Reverse the above procedure to install.

- 6 -

View of PCB

PCB

->

Theory of parts

Note: This map is applies to 7201 model.

Note: This map is applies to 7207A model.

- 7 -

PCB

->

Theory of parts

Description

PS

D/ED

EV1

EV2

EV3

ISS

ISB

IAQS

FM

FAN

Mark

HEAT

ACL

ACN

EV-L

RE

ML

Function

Output for Heating Element

Input of line

Input of neutral

Input of inlet valve

Thermister

Washing Pump

Drain Pump

Dispenser

Inlet valve

Softener

Halfload Valve

Salt detect

Rinse detect

Overflow detect

Flowmeter

Fan

There is small pole’s location difference between different models.

But the marks on PCB have the same meaning described on the left side .

- 8 -

Inlet Valve

->

Theory of parts

Location of inlet valve

Bottom view terminals

Appearance

connect to inlet water hose to air breaker electric coil inside

The work principle

The inlet valve is electromagnetic valve that decide whether water enter or not. Valves are normally closed. Each time the appliance requires water, the controller will convey an electric signal to the coils to open the valves.

The inlet valve consist of electric coil, valve body, valve pole, filter etc.

In a word, the electromagnetic valve can act to allow water enter into machine, when it receive the order given by controller.

The defeat point

1. The valve coil is broken, so the valve can’t open. It will cause the E1 error.

2. The filter is jammed, so water can’t enter. It will cause the E1 error.

3. The connector is loose, so the valve can’t open. It will cause the E1 error.

4. The valve pole is rusted or locked by dreg, so the valve can’t open or close. It will cause the E1 or E4 error.

Technical data

Nominal voltage

Frequency

Resistance

Work duty

Flux

Power

Work Pressure

220-240VAC

50/60Hz

Approx:3.4-4.4kΩ

100%ED T25

3min/5min T60

2.5L/min 15%

5W

0.04-1MPa

- 9 -

Inlet Valve

->

Theory of parts

Access inlet valve

1. Disconnect power.

2. Remove the water inlet hose. (Note : Be careful of remain water drop.)

3. Remove the cover of the bottom board.

4. Disconnect the 2 terminal lugs from the inlet valve.

5. Pull out the valve a little then contrarotate it to take it off.

6. Remove the clamp and disconnect the inlet hose (to air breaker) from the water valve.

7. Reverse above procedures to install.

Inspect inlet valve

Check electric part

1.Open the protecting box and take out the PCB;

2.With the door closed, unplug the CON3 and ACN wires , then use the multi-meter Ω shelf to measure resistance between the blue wire (EV1) and the blue wire(ACN), the normal resistance is about 3.4K

Ω Ω

3. I f the measured resistance is not correct, it means the valve coil is broken or the connector is loose. In this case, we should check the connection first. If the problem hasn’t been solved by re-connection, we should replace the valve..

4.If the resistance is OK, we need to inspect the valve body.

EV1

ACN

Check machine part

1. If the electric part is OK, we need to check the machine part.

2. Check the valve filter. if the valve filter is blocked, we need clear the residues.

3. If the valve filter is clear and the valve can’t inlet water, check whether valve can act or not. If it isn’t , we need replace the valve.

4. If the water is continue entering, we need replace the valve.

- 10 -

Location of Drain Pump

Bottom view

Drain Pump

->

Theory of parts

The work principle

Drain pump integrated into sump

The work principle

Drain pump consists of electrical motor, impeller, inlet and outlet.

Drain pump is a kind of pump driven by permanent magnet synchronous motor. The rotor is made with permanent magnet material, the running inertia of rotor is very small, the stator consist of silicon steel stack and coil. When the drain pump is on power, the rotor will be very easy to start.

The defeat point

1. The motor coil is broken, so the drain pump can’t work. It will cause the E2 , E4 or E1 error

.

2. The magnetism of motor rotor is weak, so drain pump cannot work. It will cause the E2, E4 or E1 error .

3. The connector is loose, so the drain pump can’t work. It will cause the E2, E4 or E1 error .

4. The rotor is locked by residues, so the drain can’t work . It will cause the E2, E4 or E1 error .

5.The drain pump assembly rack is loose, it will cause noise.

6.The non-return valve is bad, the remain water is too much.

Explanatory notes: failure of drain pump may cause E1, becaus

Technical data

Nominal voltage

Frequency

Resistance

Delivery height

Delivery performance

220-240VAC

50Hz

167 10%Ω

1M

≥17l/min(230VAC)

- 11 -

Drain Pump

->

Theory of parts

Access drain pump

Top

1. Drain off the water in the dishwasher, and disconnect the power supply

(Note : Make sure to remove remained water in the dishwasher. If not, wet the floor.)

2.Loosen the hooks, and then remove bottom board.(Note:You should first loosen the top hooks, then the left and right hooks. and be care do not break the hook.)

3. Label and disconnect the two terminal lugs from the drain pump.

4. Contrarotate the drain pump to take it off.

5. Reverse the above procedure to install.

Inspect drain pump

Check the electric part

1.Open the protecting box and take out the PCB;

2.With the door closed,unplug the CON3 and ACN wires, then use the multi-meter Ω shelf to measure the red wire

(PS) and blue wire (ACN), the normal resistance is about

150 Ω Ω

3. If the measured resistance is not correct, it means the pump coil is broken or connector is loose. In this case, we should check the connection first. If the problem hasn’t been solved by re-connection, we should replace the drain pump.

4.If the resistance is OK, but it also can’t work, maybe the magnetism is too weak, so we need to replace the drain pump.

PS

ACN

Check the machine part

1. If the electric part is OK, we need to check the machine part.

2. Remove bottom board.

3. If the non-return valve is wrongly assembled, the tub will remain much water. We need to re-assemble the non-return valve.

4. If the drain pump is working, but no water drain out or just a little. We should check the drain hose or drain body.

- 12 -

Location of Heater

Bottom view

Heater

->

Theory of parts

The work principle

fuse pressure switch

Technical data

Nominal voltage

Rating power

Resistance

Fuse

230VAC

1800W

29.4 10%Ω

167℃

The defeat point

1. The heater coil is broken, so the heater cannot work. It will cause the E3 error.

2. The Fuse is active, so the heater cannot work. It will cause the E3 error.

3. The connector is loose, so the heater cannot work. It will cause the E3 error.

- 13 -

Heater

->

Theory of parts

Access heater

1. Drain off the water in the dishwasher, and disconnect the power supply.

(Note : Make sure to remove remained water in the dishwasher. If not, wet the floor)

2. Remove bottom board.

3. Label and disconnect the terminals.

4. Remove the 3 screws for fixing the heating element.

5. Reverse above procedures to install.

Inspect heater

1. Remove bottom board.

2. With the door closed,use the multi-meter Ω shelf to measure resistance between the two terminals shown in above right picture, the resistance is about 29 Ω Ω

3. If the measured resistance is not correct, it means the heater coil or the thermostat is broken, we should replace the heating element or the thermostat.

- 14 -

Washing Pump

->

Theory of parts

Location of Washing Pump

B ottom

View

The work principle

BLUE

BLUE

RED

M

A

150℃

BLACK

M-main coil

A-assistant coil

Washing pump is a kind of asynchronism motor with capacitor. The stator consist of silicon steel stack and two coils, main coil and assistant coil .

The defeat point

1. The motor coil is broken, so the wash pump can’t work. It will cause E3 error.

2. The motor rotor capacitor is weaken, so washing pump can’t start. In this case, it will send out the electromagnetism noise. If it is continue electrifying motor, the thermal protector will work. It will cause E3 error.

3. The connector is loose, the wash pump can’t work. It will cause E3 error.

4. The rotor is locked by residues, so the wash pump can’t work . It will cause the E3 error.

5.The drain pump assembly bracket is loose, it will cause noise.

6.If the machine hasn’t been used for long time, there is a possibility the wash pump can’t starting.

Technical data

Models

YXW48-2F-1

Items

Nominal voltage 220-240VAC

Frequency

Resistance

YXW48-2F

50Hz

Main coil: 159.4 10%Ω

220-240VAC

50Hz

Main coil:120.10 7%Ω

Assistant coil:93.3 10%Ω Assistant:107.7 7%Ω

Delivery height 1m

Delivery

≥50l/min(230VAC) performance

1m(230VAC)

≥50l/min(230VAC)

Lock rotor current

Operating current

Capacitor

0.5A 10%

0.24A 15%

3μF /425V

0.85A 10%(230VAC)

0.37A 10%(230VAC)

3μF/425V

- 15 -

Washing Pump

->

Theory of parts

Access Washing Pump

1. Disconnect power.

2. Remove bottom board.

3. Label and disconnect the 2 terminals to the motor wire connector.

4. Remove the clamp fastening the interconnect hose to the sump.

Caution: The clamp is easily damaged during removal and can’t be reused. Replace the old clamp with a new universal clamp.

5. Disconnect the ground wire from the wash pump motor assembly.

6. Remove the motor pump assembly from the dishwasher.

7. Reverse above procedures to install.

Inspect Washing Pump

Check the electric part

1.Open the control panel and take out PCB;

2.With the door closed, unplug the CON5 , then use the multi-meter Ω shelf to test resistance between two wires

(ML and ACN), the normal resistance is about 100 Ω to

170 Ω .

3. I f the resistance is not correct, it means the pump coil is broken or the connector is loose, In this case, we should check the connection first. If the problem hasn’t been solved by re-connection, we would replace the washing pump.

4.If the resistance is OK but it cannot work, it maybe the capacitor weakly, we need to replace the capacitor.

ML

ACN

Check the machine part

1. If the electric part is OK, we need to check the machine part.

2. Remove bottom board.

3. Check the pump assembly, if the bracket is loose, it will bring the noise, we need to tighten it.

4. If the wash pump cannot start and the machine hasn’t been used too long, maybe the seal element is bond.

5. If the drain pump is working, but no water out or just a little. We should check the vane wheel.

- 16 -

Pressure Switch

->

Theory of parts

The work principle

The pressure switch consists of a moving diaphragm and disc which activate a change over contact. The contact can be calibrated to trip and reset at the desired pressure levels, The main application is to control the level of water in appliances. May also provide flood protection.

In our production, May also provide flood protection, like 135/115 serial.

1- COM

2 - NC

3 - NO

2

1

3

Front view

Back view

- 17 -

Location of NTC

NTC

->

Theory of parts

The work principle

Negative Temperature Coefficient Thermistor is integrated into sump, which is used for measuring temperature of water in the tub.

Access NTC

1. Remove bottom board.

2. Remove two screws securing the NTC to sump(shown in above picture).

3. Take out NTC.

4. Reverse the above procedure to install.

- 18 -

NTC

->

Theory of parts

Inspect NTC

1.Open the protecting box and take out PCB;

2.With the door closed,unplug the RE connector(shown in below picture), then use the multi-meter Ω shelf to test resistance between two blue wires(RE and GND) , the normal resistance is shown in below table.

3. I f the resistance is not correct, it means NTC circuit has a problem. In this case, we should check the connection first. If the problem hasn’t been solved by re-connection, we would replace the NTC.

RE

GND

NTC resistance table

NTC

15℃

20℃

25℃

30℃

40℃

50℃

60℃

70℃

80℃

85℃

17.48KΩ

12.12KΩ

10KΩ

8.299KΩ

5.807KΩ

4.144KΩ

3.011KΩ

2.224KΩ

1.667KΩ

1.451KΩ

- 19 -

Location of Flowmeter

Flowmeter

->

Theory of parts

The work principle

Flowmeter is integrated into Air Breaker. Function of

Flowmwter is measure how much water has entered in appliance. it consists of impeller, tongue tube and terminal, etc.

When water pass through the flowmeter, moving water can rotate magnetic impeller, the tongue tube can sense the impeller ’s magnetic and send electronic pulses.

Flowmeter

- 20 -

Flowmeter

->

Theory of parts

Access Flowmeter

1. Remove the baseboard, top panel and left side panel.

2. Remove the plastic nut inside tub, which secures the air breaker to tub.(Because flowmeter is integrated into air breaker, replace air breaker if flowmeter has failure. )

3. Disconnect the wire and remove clamp fastening hose to air breaker.

4. Take out air breaker.

5. Reverse the above procedure to install.

Inspect Flowmeter

1.Open the protecting box and take out PCB;

2.With the door closed, unplug the CON2 wire(shown in below picture), then use the multi-meter Diode shelf to test between black wire(FM) and blue wire(GND) to confirm whether electrical pulse is sent out while water is passing through flowmeter, or not.

3. If there is continual electrical pulse, the multi-meter will send out sound “de” continually.

4.if there is no electrical pulse, the multi-meter will not send sound. In this case, it means something wrong with flowmeter circuit. We should check the connection first. If the problem hasn’t been solved by re-connection, we should replace the air breaker..

FM

GND

- 21 -

Location of Safety Hose

Safety hose

->

Theory of parts

Electronic Aquastop Hose

The work principle

Mechanical Aquastop Hose

Electronic Aquastop Hose

There are two types of Safety Hose, mechanical Aquastop hose and electronic Aquastop hose, which have different principles and assembly modes.

Mechanical Aquastop safety hose has two layers. If water leak and fill the air space between two layers, the foaming material will expand and lock the hose. In this situation, the machine might set off E1 alarm.

Electronic Aquastop safety hose also has two layers. But the difference from mechanical is that if the water leak and flow on the bottom tray, the flooding pressure switch on the tray will act, the electromagnetic valve on the hose will cut off the water road and the machine will set off E4 alarm.

- 22 -

Safety hose

->

Theory of parts

Access Safety Hose

clamp wire co nnecter

(no need to distinguish positive and ne gative elec trode

) clamp r ing

1. Remove baseboard, side baseboard, top panel and left side panel.

2. Remove clamp, cut the bound belt and disconnect the wire connector. Then the Inlet hose cane pulled out.

3. Reverse the above procedure to assemble.

Mechanical Aquastop Hose

Mechanical Aquastop hose is connected to appliance just as universal water inlet hose.

Inspect Safety Hose

Electronic Aquastop Hose

1.Open the protecting box and take out the PCB;

2.With the door closed, unplug the CON3 and ACN wires , then use the multi-meter Ω shelf to measure resistance between the blue wire (EV1) and blue wire (ACN). Open circuit and short circuit are both incorrect.

3. I f the measured resistance is not correct, it means the valve coil is broken or the connector is loose. In this case, we should check the connection first. If the problem hasn’t been solved by re-connection, we should replace the safety hose.

Mechanical Aquastop Hose

Maybe moisture absorption of foaming material in mechanical device cause a self-lock fault(can’t fill the water) and this lock is non-resettable.

- 23 -

The work principle

Diverter, also named alternating flow control valve, is used to control the flow of water between the upper and lower spray arms and can also be used on some models to stop the flow of water to the upper spray arm on models equiped with a half load feature.

Diverter valve

->

Theory of parts

Access Diverter valve

1. Disconnect power.

2. Remove bottom board.

3. Label and disconnect the 2 terminals.

4. Remove the screws fastening the diverter valve to pump.

5. Reverse the above procedure to install.

diverter valve

- 24 -

Test Program

Test Program

In order to check the operation of components of appliance and find out the malfunction, we designed this program for technician.

How to activate Test Program

Test Program Operation

E3

E4

E6

E7

E8

How to activate

Test Program

Start Test

Program

Jump into next step

E1

E2

J7225

With door opened,

Program + Power

Close the door

Program

E1

E3

E4

E6

E7

E8

/

To activate test program, with the door opened and within 60s after power on, hold down the Program button and press the POWER button until the machine enter into Test Program. The appliance will pause and stand by(as step 00). Then close the door to start the Test Program.

During test program running

, you can press

( ).

Program button to jump

Note:

The way to activate test program is slightly different between different models.

- 25 -

Procedure

->

Test Program

Procedure of Test Program

(for models controlling water filling by flowmeter)

No.

Dis play on t he s c reen

Process Description

0 8:88 Intialization Power on, stand by

1

2

3

05 or

Turbidity value

Inlet Valve

Open inlet valve and feeds with 3.6L water. The diverter would move to positon rotating both upper and lower sprayarms. If the model is equipped with turbidity sensor, turbidity value would be adjusted and shown on the screen.

04/Temperature value

Higher-speed

Washing Pump and Heating

Element

Run higher-speed washing pump and 10s later run heating element until the water temperature reaches 57℃. Then the machine will pause.

Press Program button to jump into the next step.

03

Lower-speed

Washing Pump and Dispenser

2s later run lower-speed washing pump for 8s, dispenser will act for 45s in this step.

4 02

Regeneration

Valve

Open regeneration valve for 30s.

5 01 Drain Pump Drain for 30s.

6 F* finish Buzz one sound, stop, and stand by.

- 26 -

Error Code

->

Test program

How to know which error code has occurred

To know which error code has occurred, refer to the previous table named Test Program

Operation.

Take 7201 for example, If the error 1 has happened, the buzzer would alarm for 30 seconds and “E1” would be shown on display. Other error alarms would be shown in the same manner.

Take 7303 for example, if the error 7 has happened, the buzzer would alarm for 30 seconds and the Glass, 1 hour and Rapid indicators would flash simultaneously. Other error alarms can be deduced from this.

The corresponding relation between indicator combination code shown in above figure.

Notice: the majority of models are follow this regulation.

and error

Attention

Priority level of E4 is the highest. E4 operation is valid after other error operations have done. When E4 operation has done, all the others are invalid.

In test program, E1, E3, E4, E6, E7 and E8 are valid.

Note: E8 is valid for models equipped with diverter valve(alternative washing function).

- 27 -

Error Code

->

Test program

How does the appliance react when error code occurred

E1 Water filling exceed pre-set time

If the inlet valve has been opened for 4 minutes but the water quantity hasn’t reached the desired value(measure by pluses), E1 would occur.

When E1 occurs, the drain pump will run until flowmeter keep motionless for 2 minutes and all the other components will be stopped immediately. At the same time, the buzzer will alarm for 30 seconds and error 1 will be shown.

E3 Heating exceed pre-set time

If the heating element has been working for 60 minutes but the water temperature detected by NTC hasn’t reached desired value. E3 would occur.

When E3 occurs, the drain pump will run until flowmeter keep motionless for 2 minutes.

and all the other components will be stopped immediately. At the same time, the buzzer will alarm for 30 seconds and the error 3 will be shown.

E4 Overflow

At any time, if overflow micro-switch act and keep for longer than 2 seconds, the E4 would occur. When E4 occurs, the drain pump will run until flowmeter keep motionless for 2 minutes . and all the other components will be stopped immediately.

At the same time, the buzzer will alarm for 30 seconds and error 4 will be shown.

Note: Priority level of E4 is the highest. E4 operation is valid after other error operations have done. When E4 operation has done, all the others are invalid.

E6 Open-circuit failure of thermistor

In test program, once open-circuit failure of thermistor is detected by controller, the E6 would occur. When E6 occurs, the drain pump will run until flowmeter keep motionless for 2 minutes. and all the other components will be stopped immediately.

At the same time, the buzzer will alarm for 30 seconds and error 6 will be shown.

- 28 -

Error Code

->

Test program

E7 Short-circuit failure of thermistor

In test program, once short-circuit failure of thermistor is detected by controller, the E7 would occur. When E7 occurs, the drain pump will run until flowmeter keep motionless for 2 minutes . and all the other components will be stopped immediately. At the same time, the buzzer will alarm for 30 seconds and error 7 will be shown.

E8 Diverter valve fault

For models equipped with diverter(alternative washing function)

In the process of test program in which diverter valve should be act, if machine doesn’t detect the feeding signal of diverter valve for 15 seconds or doesn’t detect the diverter valve being positioned accurately in 60 seconds, the E8 would occur.

In the process of washing program in which diverter valve should be act, if machine doesn’t detect the feeding signal of diverter valve for 15 seconds or doesn’t detect the diverter valve being positioned accurately in 60 seconds, the diverter valve would stop and the E8 would be set off after ending washing program.

When E8 occurs, the drain pump will run until flowmeter keep motionless for 2 minutes and all the other components will be stopped immediately. At the same time, the buzzer will alarm for 30 seconds and the error code will be shown.

- 29 -

E1 tree

->

Inspection

E1 code

Longer inlet time

Is there any water in the Tub?

No water

Make a check of inlet hose of AQUASTOP,

(only for the dishwasher with AQUASTOP device)

Failure

Replace it to solve the problem

Little water

Make a check of Tap

Not open

Open it to solve the problem

Opened

Make a check of Inlet

Hose

Failure

Inlet Hose is blocked or kinked

Failure solve the problem

OK

Check whether the Inlet

Valve circuit is correct or not. (mentioned in section

4)

Correct

Model with Flowmwter

Not

Model with Pressure

Switch(83/63)

Reconnect the wire of

Inlet Valve circuit and check again

Still wrong

OK

Check whether the

Pressure Switch(83/63) circuit is correct or not.

Not

Reconnect the wire of

Pressure Switch circuit and check again

OK

Still wrong solve the problem

Replace the Inlet

Valve to solve problem solve the problem

Replace the

Pressure switch to solve problem

Check whether the

Flowmeter circuit is correct or not. (mentioned in section 4)

Not

Reconnect the wire of

Flowmeter circuit and check again

OK solve the problem

Still wrong

Replace the

Flowmeter to solve problem

Make a check of the

Hydraulic pressure.

(0.04-1.0MPa is ok)

Lower

OK

Give advice to consumer

Make a check of

Drain Hose

Wrong

Hang correctly to solve the problem

If the problem has not been solved through all the inspection mentioned above, maybe the

PCB has a malfunction. So, replace PCB and test again.

- 30 -

E3 tree

->

Inspection

E3

Longer heating time

Check water temperature in the tub

Low

Make a check of over heat proof heating Micro-switch.

Failure

Replace Switch to solve the problem

High

OK

Check whether the filter is jammed severely or not

Jammed

Clear or replace filter to solve the problem

OK

Make a check of Heater.

(mentioned in section 4)

Failure

Reconnect the wire of

Heater circuit and check again

OK solve the problem

OK

Still wrong

Replace the Inlet

Valve to solve problem

Check whether the

Washing Pump circuit is correct or not. (mentioned in section 4)

Not

Reconnect the wire of

Washing Pump circuit and check again

OK solve the problem

Still wrong

Replace the

Washing Pump to solve problem

Check whether the

NTC circuit is correct or not.(mentioned in section 4)

Not

Reconnect the wire of

NTC circuit and check again

OK

Still wrong solve the problem

Replace the NTC to solve problem

- 31 -

E4 tree

->

Inspection

E4

Overflow

Is there any water on the bottom board?

No water

Make a check of

Flooding Switch circuit(normally closed)

Failure

Some water

Reconnect the wire of

Flooding Switch circuit and check again

OK solve the problem

Still wrong

Check whether Flooding

Switch is blocked or not

Blocked

Repair or Replace it to solve problem

Make sure consumer use the proper detergent and rinse

Improper

Give advice

OK

Make a check of

Drain Hose

Failure

Drain Hose is kinked or blocked

Failure

Correct

Solve the problem

Model with Pressure

Switch(83/63)

OK

Model with

Flowmeter

Check whether the

Flowmeter circuit is correct or not. (mentioned in section 4)

Not

Reconnect the wire of

Flowmeter circuit and check again

OK solve the problem

Still wrong

Replace the

Flowmeter to solve problem

Check whether the

Pressure Switch(83/63) circuit is correct or not.

Not

Reconnect the wire of

Pressure Switch circuit and check again

OK solve the problem

Correct

Maybe there is a real leakage

Still wrong

Replace the

Pressure Switch to solve problem

Do as follows

Remove two side panels

Remove the water from the bottom board and make sure there is no water at the bottom board.

Restart the dishwasher with a strong or standard wash program as a leakage could easily repeat at a higher temperature and after a long period of running time.

Observe the bottom tray every twenty minutes.

If any water appears, you will found out which areas, such as motor, drain pump, sump, softener, and hoses between them, and also clips at the end of each hose, besides the weld seam at the bottom of the tub.

If hours passed, but no water comes out, you should stop the dishwasher with sufficient water in the inner tub, and observe it again after leaving it alone for one to two hours.

- 32 -

E6&E7 tree

->

Inspection

E6

Open-circuit failure of thermistor

Check whether the NTC circuit is correct or not.

(mentioned in section 4)

Not

Reconnect the wire of

Flowmeter circuit and check again

OK solve the problem

Still wrong

Replace the NTC to solve problem

E7

Short-circuit failure of thermistor

Check whether the NTC circuit is correct or not.

(mentioned in section 4)

Not

Reconnect the wire of

Flowmeter circuit and check again

OK solve the problem

Still wrong

Replace the NTC to solve problem

E8

Diverter valve fault

Check whether the

Diverter Valve circuit is correct or not. (mentioned in section 4)

Not

Reconnect the wire of

Diverter Valve and check again

OK solve the problem

Still wrong

Replace the NTC to solve problem

If the problem has not been solved through all the inspection mentioned above, maybe the

PCB has a malfunction. So, replace PCB and test again.

Caution:

Because the real situation is unpredictable, inspection trees mentioned in this manual are for reference only.

- 33 -

Troubleshooting

- 34 -

Troubleshooting

- 35 -

Troubleshooting

- 36 -

Troubleshooting

- 37 -

Troubleshooting

- 38 -

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