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Technical Service Manual
Contents
SAFETY NOTICE
This documentation is only intended for qualified technicians
who are aware of the respective safety regulations.
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3-4
3-4
5-23
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6-7
8-10
11-12
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Table of Contents

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   Summary of Contents for Hanseatic WQP12-7311D

  • Page 1: Table Of Contents

    Technical Service Manual Contents Specification Function Description Water circuit Theory of parts 5-23 Location Inlet valve 8-10 Drain pump 11-12 Heater 13-14 Washing pump 15-16 Pressure switch 18-19 Flowmeter 20-21 Safety Hose 22-23 Test program 24-28 Procedure Error code 26-28 Inspection 29-32 Troubleshooting...
  • Page 2: Specification

    Specifications Models: WQP12-7311D WQP8-7312D 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 -...
  • Page 3: Function Description

    -> Function Description Water Circuit - 3 -...
  • Page 4 -> Function Description Water Circuit 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.
  • Page 5: Theory Of Parts

    -> Theory of parts Location air breaker heater main PCB drain pump sump washing pump 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 - 5 -...
  • Page 6: 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. Access PCB Removing the protecting box. The PCB can be removed from the protecting box in the bottom of machine. 1.
  • Page 7 -> Theory of parts Vi ew of P C B Note: This map is applies to 7201 model. Note: This map is applies to 7207A model. - 7 -...
  • Page 8 -> Theory of parts Description Mark Function HEAT Output for Heating Element Input of line Input of neutral EV-L Input of inlet valve Thermister Washing Pump Drain Pump D/ED Dispenser Inlet valve Softener Halfload Valve Salt detect Rinse detect IAQS Overflow detect Flowmeter There is small pole’s location difference between different models.
  • Page 9: Inlet Valve

    Inlet Valve -> Theory of parts Location of inlet valve Appearance terminals connect to Bottom view 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.
  • Page 10 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.
  • Page 11: Drain Pump

    Drain Pump -> Theory of parts Location of Drain Pump The work principle Bottom view 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.
  • Page 12: Drain Pump

    Drain Pump -> Theory of parts Access drain pump 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.
  • Page 13: Heater

    Heater -> Theory of parts The work principle Location of Heater Bottom view fuse pressure switch Technical data Nominal voltage 230VAC Rating power 1800W Resistance 29.4 10%Ω Fuse 167℃ The defeat point 1. The heater coil is broken, so the heater cannot work. It will cause the E3 error. 2.
  • Page 14: Heater

    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.
  • Page 15: Washing Pump

    Washing Pump -> Theory of parts Location of Washing Pump The work principle BLUE BLUE View ottom BLACK 150℃ 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 .
  • Page 16: Washing Pump

    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.
  • Page 17: Pressure Switch

    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.
  • Page 18: Ntc

    -> Theory of parts Location of NTC 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.
  • Page 19 -> 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.
  • Page 20: Flowmeter

    Flowmeter -> Theory of parts Location of Flowmeter 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.
  • Page 21: Flowmeter

    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.
  • Page 22: Safety Hose

    Safety hose -> Theory of parts Location of Safety Hose 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.
  • Page 23 Safety hose -> Theory of parts Access Safety Hose clamp wire co nnecter ( no nee d to di stinguish positive and ne gative elec trode) clamp r ing 1. Remove baseboard, side baseboard, top panel and left side panel. 2.
  • Page 24: Test Program

    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 7311D 7312D How to activate With door opened, Test Program Program + Power Start Test...
  • Page 25: Procedure

    Test Program Procedure -> Procedure of Test Program (for models controlling water filling by flowmeter) Dis play on Process Description t he s c reen Intialization Power on, stand by Open inlet valve and feeds with 3.6L water(45cm model feeds Inlet Valve with 3.0L water).
  • Page 26: Error Code

    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”...
  • Page 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.
  • Page 28: Test Program

    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 .
  • Page 29: Inspection

    Inspection E1 tree -> E1 code Longer inlet time Make a check of inlet No water Failure Is there any hose of AQUASTOP, Replace it to solve water in the Tub? (only for the dishwasher the problem with AQUASTOP device) Little water Not open Open it to solve the Make a check of Tap...
  • Page 30 E3 tree Inspection -> Longer heating time Failure Check water Make a check of over heat Replace Switch to temperature in the tub proof heating Micro-switch. solve the problem High Jammed Check whether the filter is Clear or replace filter jammed severely or not to solve the problem Reconnect the wire of...
  • Page 31 E4 tree Inspection -> Overflow Make a check of Reconnect the wire of No water Failure Is there any water on Flooding Switch Flooding Switch circuit solve the problem the bottom board? circuit(normally closed) and check again Still wrong Some Blocked Check whether Flooding Repair or Replace it...
  • Page 32: Inspection

    E6&E7 tree Inspection -> Open-circuit failure of thermistor Check whether the NTC Reconnect the wire of circuit is correct or not. Flowmeter circuit and solve the problem (mentioned in section 4) check again Still wrong Replace the NTC to solve problem Short-circuit failure of thermistor Check whether the NTC...
  • Page 33: Troubleshooting

    Troubleshooting - 33 -...
  • Page 34 Troubleshooting - 34 -...
  • Page 35 Troubleshooting - 35 -...
  • Page 36 Troubleshooting - 36 -...
  • Page 37: Troubleshooting

    Troubleshooting - 37 -...

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