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.
Ω
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.