Delfa WQP12-9242B, WQP8-9241B Technical & Service Manual

Contents

Technical Service Manual

Dishwasher

Specification 2

Test program 24-28

Theory of parts 5-23

Function Description 3-4

Inspection 29-33

Location 5

PCB 6-7

Inlet valve 8-10

Drain pump 11-12

Heater 13-14

Washing pump 15-16

Procedure 25

Error code 26-28

Water circuit 3-4

Pressure switch 17

NTC 18-19

Flowmeter 20-21

Safety Hose 22-23

Troubleshooting 34-38

SAFETY NOTICE

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

- 1 -

Specifications

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

Electrical supply 220-240V, 50Hz
Supply water pressure 0.04MPa-1.0MPa
Supply water temperature below 60℃

- 2 -

Models:WQP12-9242B WQP8-9241B

washing pump

pressure switch

drain pumb

drain hose

over flow switch

air breaker

inlet valve

inlet hose

Regeneration water route

upper spray arm

top spray

tube

Inlet water route

lower spray arm

softener

Water circuit scheme

regeneration valve

Cycle water route

Drain water route

Water Circuit Function Description->

- 3 -

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)

Cycl e washing act ion is driven b y washing pum p motor. Wa ter can obtain the power during it passing through
the working washing pump, then be pumped into spray arm, pass from spray ar m nozzles, over the dishes,
into sump ,where connect to washing pump, and to g et in the next wa ter cycle.

Process of regeneration (indicated by green route)

Regeneration valve is open, the regenerating water dissolve salt in the s alt chamber o f softener, an d then
ente r in the resin ta nk to reactiv ate the resin .

Water Circuit Function Description->

- 4 -

Location Theory of parts->

Inlet valve

Washing pump

Capacity

Softener

Overflow switch

Filter system

Heater

Over Heat Proof
Micro-switch

Dispenser

Sump

Water inlet

Air breaker

Pressure switch(83/63)

(only for m od els whose w at er fillin g
be contro ll ed by press ur e switch)

Pressure switch(140/120)

Please Note: Exploded view and part list of each model have some different visions, so
please refer to newest vision Midea sent you.

- 5 -

PCB Theory of parts->

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.

Removing the control panel

The control panel can be removed from dishwasher door.

1. Remove the six screws securing the control panel to the door.

2. The control panel will drop down and be free of the door. But, the wiring will
still connected to the control panel.

S

08

1
2

on
Off

Access PCB

3. Disconnect the connector form PCB.

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

5. Remove the PCB.

6. Reverse the above procedure to install.

PCB

Note: For the majority of models, the PCB is located behind the control panel. The minority
of models locate the PCB on the side of strengthening muscle. You can judge the location by
the newest exploded view Midea sent you.

- 6 -

PCB Theory of parts->

Map of PCB

Description

Mark Function

HEAT Output for Hea ting Element
ACL Input of live wire

ACN Input of bull line
IS Input of Door Switch

EV1-L Firewire input of inlet valve

RE Thermister
ML Washing Pump
PS Drain Pump

D/ED Dispenser
EV1 Inlet valve

EV2 Softener
EV3 Halfload Valve

ISS Salt detect
ISB Rinse detect

IAQS Overflow detect
FM Flowmeter

FAN Fan
PO Pressure Switch(83/63)

Note: This map is applies to 9378A model.

There is small pole’s location difference
between different models.
But the marks on PCB have the same meaning

.described on the left side

- 7 -

Technical data

Location of inlet valve

Appearance

Inlet Valve Theory of parts->

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.

to air breaker

connect to
inlet water hose

terminals

electric coil inside

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.

Nominal voltage 220-240VAC
Frequency 50/60Hz
Resistance Approx:3.4－4.3kΩ

100%ED T25
3min/5min T60

Flux 4L/min ±15％
Power 6W
Work Pressure 0.04－1MPa

Work duty

- 8 -

Inlet Valve Theory of parts->

3. Top panel

4. Left side panel

1. Baseboard

2. Left baseboard

5. Middle rear
crosspiece

Inlet valve

Access inlet valve

1. Disconnect power.

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

3. Remove the baseboard, left baseboard, top panel, left side panel and middle rear
crosspiece.

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

5. Push the valve from the lower
rear crosspiece to take it off.

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

7. Reverse the above procedure
to install.

1.Open the control panel and take out the PCB;

2.Unplug the CON3 and P4 wires , then use the multi­meter Ω shelf to measure resistance between the blue
wire (EV1) and white wire (IS), the normal resistance is
about 3.4KΩ to 4.3KΩ.

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.

Inspect inlet valve

unplug

Check electric part

Attention: Build in models have no Baseboard and

left and right baseboard, but adjustable baseboard.

- 9 -

IS

EV1

Inlet Valve Theory of parts->

Check machine part

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

2. Remove the baseboard, left baseboard, top panel, left side panel and middle rear
crosspiece.

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

4. 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.

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

- 10 -

Drain Pump Theory of parts->

Bottom View

Location of Drain Pump

Technical data

The work principle

to washing pump

connect to drain hose

motor

terminals

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

Nominal voltage 220-240VAC

Frequency 50Hz

Resistance 150－220Ω

Delivery height 1M

Delivery performance ≥17l/min(230VAC)

- 11 -

Drain Pump Theory of parts->

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.

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 four screws on bottom, and then
remove bottom board.

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

4. Remove screws securing the drain pump to
sump, then remove drain pump.

5. Reverse the above procedure to install.

Access drain pump

Inspect drain pump

Check the electric part

1.Open the control panel and take out the PCB;

2.Unplug the CON4 and P4 wires, then use the multi­meter Ω shelf to measure the red wire (PS) and white wire
(IS), the normal resistance is about 150Ω to 220Ω.

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.

- 12 -

IS

PS

The defeat point

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

2. The thermostat 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.

Heater Theory of parts->

Bottom View

The work principle

Technical data

Location of Heater

pressure switch

Nominal voltage 230VAC

Rating power 1800W
Resistance 29.265±1.463Ω

Thermastat1 98℃
Thermastat2 229 ℃

- 13 -

Inspect heater

1. Remove bottom board.

2. Use the multi-meter Ω shelf to measure resistance
between the two terminals shown in right picture, the
resistance is about 29Ω to 31Ω.

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.

Heater Theory of parts->

Bottom View

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 to and ground wire.

4. Remove the 2 clamps from the Heating element.
Caution: The clamp is easily damaged during removal and can’t be reused. Replace the old
clamp with a new universal clamp .

5. Reverse the above procedure to install.

Clamps

Ground terminal

Terminals
(measure heater resistance)

terminals

- 14 -

BLUE

BLACK

M

BLUE

A

150℃

RED

Washing Pump Theory of parts->

Bottom View

Location of Washing Pump

Technical data

The work principle

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.

M-main coil
A-assistant coil

Models
Items

YXW65-2B YXW50-2

Nominal voltage 220-240VAC 220-240VAC
Frequency 50Hz 50Hz

Main coil: 84.8±7%Ω Main coil:93.10±7%Ω

Assistant coil:78.6±7%Ω Assistant:95.99±7%Ω
Delivery height 0.8m 1m(230VAC)
Delivery
performance

≥50l/min(230VAC) ≥50l/min(230VAC)

Lock rotor
current

≤1.50A 1.0±10%(230VAC)

Operating
current

0.65A±10% 0.47±10%(230VAC)

Capacitor 5μF 3μF

Resistance

- 15 -

Washing Pump Theory of parts->

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.

Access Washing Pump

1. Disconnect power.

2. Remove bottom board.

3. Label and disconnect the 2 terminals to the capacitor.

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

5. 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 (Dia-31.0mm)

6. Remove the clamp fastening interconnect hose to the lower nozzle .

7. Remove the clamp fastening interconnect hose to heater.

8. Remove the screw and disconnect the ground wire from the wash pump motor assembly.
Note: Do not attempt to remove the bolt and locknut connecting the motor mount to the
dishwasher frame.

9. Remove the motor pump assembly from the dishwasher.

10. Reverse the above procedure to install.

Inspect Washing Pump

Check the electric part

1.Open the control panel and take out PCB;

2.Unplug the CON4 and P4 wires, then use the multi­meter Ω shelf to test resistance between two white wire
(ML and IS), the normal resistance is about 78Ω to 100
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.

- 16 -

IS

ML

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, the pressure switch is to control the water level in appliance,
like 83/63 serial. May also provide flood protection, like 140/120 serial.

Manufacturer :

EMZ

11 - COM

12 - NC

14 - NO

Front view Back view

11

14

12

2

3

1

Back view

Front view

Manufacturer

:

Elbi

1- COM

2 - NC

3 - NO

Pressure Switch Theory of parts->

The work principle

- 17 -

NTC Theory of parts->

NTC

Bottom View

Location of NTC

The work principle

The work principle

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

Access Washing Pump

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.

screws

- 18 -

NTC Theory of parts->

15℃ 17.48KΩ
20℃ 12.12KΩ
25℃ 10KΩ
30℃ 8.299KΩ
40℃ 5.807KΩ
50℃ 4.144KΩ
60℃ 3.011KΩ
70℃ 2.224KΩ
80℃ 1.667KΩ
85℃ 1.451KΩ

NTC

Inspect NTC

1.Open the control panel and take out PCB;

2.Unplug the RE connector(shown in below picture), then use the multi-meter Ω shelf to test
resistance between two blue wire , 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.

unplug

NTC resistance table

- 19 -

Flowmeter Theory of parts->

Location of Flowmeter

The work principle

Flowmeter

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.

Top Panel

Side panel

Left Baseboard

Baseboard

Attention: Build in models have no Baseboard and left and
right baseboard, but adjustable baseboard.

- 20 -

Inspect Flowmeter

1.Open the control panel and take out PCB;

2.Unplug the CON27 wire(shown in below picture), then use the multi-meter Diode shelf to
test whether electrical pulse is sent out from two black wires 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..

Access Flowmeter

1. Remove the baseboard, life baseboard, top panel and life 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.

Flowmeter Theory of parts->

- 21 -

FM

Safety hose Theory of parts->

Location of Safety 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.

Electronic Aquastop Hose

Note: The assembly mode of

mechanical Aquastop hose is the same
as that of universal.

- 22 -

Safety hose Theory of parts->

Inspect Safety Hose

Access Safety Hose

clamp

bound belt

wire connecter
(no nee d to distin guish
positive and negative electrode)

clamp ring

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.

Electronic Aquastop Hose

Mechanical Aquastop Hose

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

1.Open the control panel and take out the PCB;

2.Unplug the CON3 and P4 wires , then use the multi-meter Ω shelf to measure resistance
between the blue wire (EV1) and white wire (IS). 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 -

Test Program

Take 9241B for example, with the door closed and machine off, hold down the
Rightmost 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 press Rightmost Program button to start the Test Program.

During test program running, you can press Rightmost Program button to
jump into next step(except inlet valve step).

Note:

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

How to activate Test Program

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

Test Program

9242B 9241B
How to start
Test
Program

With door closed,
Rightmost Program +

Power
Jump into
next step

Rightmost Program

E1 E1
E2 /
E3 E3
E4 E4
E6 E6

E7 E7

Test Program Operation

- 24 -

Procedure ->Test Program

No. Process

0 Initialization

1 Inlet Valve

2

Washing Pump

and Dispenser

3 Heating Element

4Drain Pump

5 Pause

6 Inlet Valve

7 Washing Pump

8 Pause

9 Washing pump

10

Drain Pump and

Regeneration

Valve

11 finish

Power on, stand by

Open inlet valve and feeds with 3.6L water(45cm models feeds with

3.0L).

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

Dispenser will act once and washing pump will run for 60s in this step.

Run washing pump and heating element until the water temperature
reaches 57℃. Then the machine will pause.

Press Rightmost Program button to jump into the next step.

Open regenaeration valve and drain for 30s.

04

03

02

01

8:88

Run washing pump for 2 mins.

Pause for 5s.

Run washing pump for 1 min.

Procedure of Test Program (for models controlling water filling by flowmeter)

Display on

the screen

0A

09

08/
temperat­ure value

07

06

05

Drain for 30s.

Pause for 10s.

Open inlet valve and feeds with 3.6L water(45cm models feeds with

3.0L). The fan would work in this step.

Description

- 25 -

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 9348 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 9239D for example, if the error 7 has happened, the buzzer would alarm for 30
seconds and the

Main, Rinse and Drying indicators would flash simultaneously. Other

error alarms can be deduced from this.

The corresponding relation between indicator and error
code shown in above figure.
Notice: the majority of models are follow this regulation, but some
special models is different.

combination

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, E2,E3, E4, E6,E7 are valid.

Note: E2 is valid for models whose water filling be controlled by pressure switch(83/63).

Attention

Error Code Test program->

- 26 -

Error Code Test program->

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.

How does the appliance react when error code occurred

For the models controlling water filling by flow meter.

If the inlet valve has been opened for 4 minutes but the pressure switch hasn’t act, E1
would occur.
When E1 occurs, the appliance will active drain pump and stop all the other components
immediately. At the same time, the buzzer will alarm for 30 seconds and error 1 will be
shown. Then, drain pump will run till the pressure switch reset and continue draining for
60 seconds.

For the models controlling water filling by pressure switch.

If the drain pump has been running for 4 minutes but the water level pressure switch
hasn’t reset, E2 would occur.
When E2 occurs, drain pump will keep working for 2 minutes and appliance will stop all
the other components immediately. At the same time, the buzzer will alarm for 30
seconds and error 2 will be shown.

E2 Draining exceed pre-set time

Note: This error code is only for models controlling water filling by pressure switch(83/63).

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 (

if

the model with the pressure switch (83/63),drain pump would run till th e pressure sw itch reset an d continue
draining for 60 seconds.

) 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.

- 27 -

Error Code Test program->

E4 Overflow

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 (

if the model with the pressure switch (83/63),drain pump would run till t he pressure s witch reset

and continue draining for 60 seconds.

) 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.

E6 Open-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 (

if the model with the pressure switch (83/63),drain pump would run till t he pressure s witch reset a nd

continue draining for 60 seconds.

) 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.

E7 Short-circuit failure of thermistor

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 (

if the model with the pressure switch (83/63),drain pump would run till t he pressure s witch reset

and continue draining for 60 seconds.

) 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.

- 28 -

E1 tree Inspection->

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.

E1 code

Longer inlet time

Make a check of Tap

No water

Not open

Open it to solve the

problem

Opened

Check whether the Inlet

Valve circuit is correct or

not. (mentioned in section

4)

solve the problem

Not

Correct

Make a check of the

Hydraulic pressure.
(0.04-1.0MPa is ok)

Little water

Give advice to

consumer

Lower

Make a check of

Drain Hose

OK

Is there any

water in the Tub?

Reconnect the wire of

Inlet Valve circuit and

check again

OK

Still wrong

Replace the Inlet

Valve to solve

problem

Check whether the

Pressure Switch(83/63)

circuit is correct or not.

Make a check of Inlet

Hose

solve the problem

Inlet Hose is blocked or

kinked

OK

Failure Failure

Reconnect the wire of

Pressure Switch circuit

and check again

Not

solve the problem

OK

Replace the

Pressure switch to

solve problem

Still wrong

Make a check of inlet
hose of AQUASTOP,
(only for the dishwasher
with AQUASTOP device)

Replace it to solve

the problem

Failure

Hang correctly to

solve the problem

Wrong

Check whether the

Flowmeter circuit is correct

or not. (mentioned in

section 4)

Reconnect the wire of

Flowmeter circuit and

check again

Not

solve the problem

OK

Replace the

Flowmeter to solve

problem

Still wrong

Model with Pressure

Switch(83/63)

Model with Flowmwter

- 29 -

E2 tree Inspection->

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.

E2 code

Longer drain time

Some water

Check whether the Drain
Pump circuit is correct or

not. (mentioned in section

4)

solve the problem

Not

No water

Is there any

water in the Tub?

Reconnect the wire of

Drain Pump circuit and

check again

OK

Still wrong

Replace the Drain

pump to solve

problem

Make a check of Drain

Hose

solve the problem

Drain Hose is blocked

or kinked

OK

Failure Failure

When there is no water in the

tub, check whether Pressure

Switch(83/63) circuit is open or

not, which control water inlet.

Reconnect the wire of

Pressure Switch circuit

and check again

OK

Still wrong

Replace the

Pressure Switch to

solve problem

Open

solve the problem

Note: This error 2 is on ly for models w hose water filling be controlled by pressure switch(83/63).

- 30 -

E3 tree Inspection->

E3

Longer heating time

Check water

temperature in the tub

Low

Check whether the

NTC circuit is correct

or not.(mentioned in

section 4)

High

Not

Make a check of over heat

proof heating Micro-switch.

Replace Switch to
solve the problem

Failure

OK

Make a check of Heater.

(mentioned in section 4)

Failure

solve the problem

Reconnect the wire of

Heater circuit and check

again

OK

Still wrong

Replace the Inlet

Valve to solve

problem

Check whether the

Washing Pump circuit is

correct or not. (mentioned

in section 4)

Reconnect the wire of
Washing Pump circuit

and check again

Not

solve the problem

OK

Replace the

Washing Pump to

solve problem

Still wrong

OK

Reconnect the wire of
NTC circuit and check

again

solve the problem

OK

Replace the NTC to

solve problem

Still wrong

Check whether the filter is

jammed severely or not

Clear or replace filter

to solve the problem

Jammed

OK

- 31 -

E4 tree Inspection->

E4

Overflow

Is there any water on

the bottom board?

Make a check of

Flooding Switch

circuit(normally closed)

solve the problem

Reconnect the wire of

Flooding Switch circuit

and check again

OK

Still wrong

Repair or Replace it

to solve problem

No water

Check whether Flooding

Switch is blocked or not

Blocked

Failure

Make a check of

Drain Hose

Some

water

Drain Hose is kinked

or blocked

Solve the problem

Failure Failure

OK

Check whether the

Pressure Switch(83/63)

circuit is correct or not.

Reconnect the wire of

Pressure Switch circuit

and check again

Not

solve the problem

OK

Replace the

Pressure Switch to

solve problem

Still wrong

Make sure consumer use

the proper detergent and

rinse

Give advice

OK

Maybe there is a real

leakage

Improper

Correct

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 af ter 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.

Check whether the

Flowmeter circuit is correct

or not. (mentioned in

section 4)

Reconnect the wire of
Flowmeter circuit and

check again

Not

solve the problem

OK

Replace the

Flowmeter to solve

problem

Still wrong

Correct

Model with
Flowmeter

Model with Pressure

Switch(83/63)

- 32 -

E6&E7 tree Inspection->

E6

Open-circuit failure of

thermistor

Check whether the NTC

circuit is correct or not.

(mentioned in section 4)

Reconnect the wire of

Flowmeter circuit and

check again

Not

solve the problem

OK

Replace the NTC to

solve problem

Still wrong

E7

Short-circuit failure of

thermistor

Check whether the NTC

circuit is correct or not.

(mentioned in section 4)

Reconnect the wire of

Flowmeter circuit and

check again

Not

solve the problem

OK

Replace the NTC to

solve problem

Still wrong

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 -