Hanseatic WQP12-7311D Operating manual

Contents

Technical Service Manual

Dishwasher

Specification 2

Test program 24-28

Theory of parts 5-23

Function Description 3-4

Inspection 29-32

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 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 220-240V, 50Hz

Supply water pressure 0.04MPa-1.0MPa

Supply water temperature below 60℃

-2 -

Models: WQP12-7311D WQP8-7312D

Inlet water routeInlet water route

Water circuit scheme

Cycle water route

Drain water route

Water Circuit Function Description->

-3 -

Process of water inlet (indicated by magenta route)

Process of cycle washing (indicated by blue 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.

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.

Water Circuit Function Description->

-4 -

main PCB

air breaker

washing pump

sump

heater

pressure switch

softener

Please Note: Explode view and part list of each model

have some different visions. So please refer to the newest

vision Midea sent you

drain pump

-5 -

Location Theory of parts->

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 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.

Access PCB

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.

PCB

-6 -

Bottom view

protecting

box

screw

-6 -

PCB Theory of parts->

View of PCB

Note: This map is applies to 7201 model.

-7 -

Note: This map is applies to 7207A model.

PCB Theory of parts->

Description

Mark Function

HEAT Output for Heating Element

ACL Input of line

ACN Input of neutral

EV-L 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

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 -

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.

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:3.4－4.4kΩ

100%ED T25

3min/5min T60

Flux 2.5L/min 15％

Power 5W

Work Pressure 0.04－1MPa

Work duty

-9 -

Bottom view

to air breaker

electric coil inside

connect to

inlet water hose

terminals

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.

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 shelf to measure resistance

between the blue wire (EV1) and the blue wire(ACN), the

normal resistance is about 3.4K to 4.4K .

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.

ΩΩ

Inspect inlet valve

Check electric part

-10 -

ACN

EV1

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.

This manual suits for next models

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