Midea WQP8-9339L-US Operating manual

Contents

Technical Service Manual

Dishwasher

Specification 2

Test program 23-27

Theory of parts 4-22

Function Description 3

Inspection 28-32

Location 4

PCB 5-6

Inlet valve 7-9

Drain pump 10-11

Heater 12-13

Washing pump 14-15

Procedure 24

Error code 25-27

Water circuit 3

Pressure switch 16

NTC 17-18

Flowmeter 19-20

Safety Hose 21-22

Troubleshooting 33-37

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 120-120V, 60Hz

Supply water pressure 0.04MPa-1.0MPa

Supply water temperature below 60℃

- 2 -

Models: WQP8-9339L-US

Water circuit scheme

Water Circuit Function Description->

- 3 -

Location Theory of parts->

Inlet valve

Washing pump

Capacity Overflow switch

Filter system

Heater

Over Heat Proof

Micro-switch

Dispenser

Sump

Water inlet

Pressure switch(83/63)

(only for models whose water filling

be controlled by pressure 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.

- 4 -

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.

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.

- 5-

PCB Theory of parts->

Map of PCB

Description

Mark Function

HEAT Output for Heating 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 only applies to 9338 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

- 6 -

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 110-120VAC

Frequency 60Hz

Resistance Approx:1.0－2.2kΩ

100%ED T25

3min/5min T60

Flux 4L/min ±15％

Power 5W

Work Pressure 0.04－1MPa

Work duty

- 7 -

Inlet Valve Theory of parts->

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, 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 multi-

meter Ω shelf to measure resistance between the blue

wire (EV1) and white wire (IS), the normal resistance is

about 1.0KΩ to 2.4KΩ.

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

Ev1

Check electric part

Attention: Build in models have no Baseboard and

left and right baseboard, but adjustable baseboard.

- 8 -

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.

- 9 -

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, because

Nominal voltage 110-120VAC

Frequency 60Hz

Resistance 78－110Ω

Delivery height 0.8M

Delivery performance ≥13l/min(230VAC)

- 10 -

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