Midea WQP8-9339L-US Technical & Service Manual Download

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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 -

Summary of Contents for WQP8-9339L-US

Page 1: ...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 ...

Page 2: ...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 ...

Page 3: ...Water circuit scheme Water Circuit Function Description 3 ...

Page 4: ...er 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 ...

Page 5: ...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 m...

Page 6: ...lve 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 ...

Page 7: ...ater 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 po...

Page 8: ...verse 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 con...

Page 9: ...eboard 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 ...

Page 10: ...or 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 caus...

Page 11: ...el 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 multi meter Ω shelf to measure the red wire PS and white wire IS the normal r...

Page 12: ...o 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 120VAC Rating power 1000W Resistance 14 20Ω Thermastat1 98 Thermastat2 229 12 ...

Page 13: ...f 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 cla...

Page 14: ...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 wa...

Page 15: ... 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 procedur...

Page 16: ...ntrol 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 princi...

Page 17: ...ve 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 17 ...

Page 18: ...lug 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 18 ...

Page 19: ...ered 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 19 ...

Page 20: ...t 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 break...

Page 21: ...ir 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 mac...

Page 22: ...ce 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 th...

Page 23: ... can press Start Pause 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 9339L US How to start Test Program With door closed Start Pause Prog...

Page 24: ...un washing Pump for 300s Drain for 60s Pause for 20s Run washing pump and heating element until the water temperature reach 49 Press Start Pause button to jump into next step Drain for 60s Run heating element for 20s Procedure of Test Program Run inlet valve for 30s Run washing pump heating element and dispensor for 60s Run washing pump and heating element until the water temperature reach 57 Pres...

Page 25: ...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 and E8 are valid Note E2 is valid for models whose water filling be controlled by pressure switch 83 63 E8 is valid for ...

Page 26: ...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 ...

Page 27: ... if the model with the pressure switch 83 63 drain pump would run till the pressure switch 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 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 o...

Page 28: ...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 on...

Page 29: ...e 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 P...

Page 30: ...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 t...

Page 31: ...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 after 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 pu...

Page 32: ...ailure 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 unpr...

Page 33: ...Troubleshooting 33 ...

Page 34: ...Troubleshooting 34 ...

Page 35: ...Troubleshooting 35 ...

Page 36: ...Troubleshooting 36 ...

Page 37: ...Troubleshooting 37 ...

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