Delfa WQP12-9242B Technical Service Manual

Text of Delfa WQP12-9242B User Guide:

• Delfa WQP12-9242B, The defeat point 1. The heater coil is broken, so the heater cannot work. It will cause the E3 error. 2. The thermostat is active, so 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 230VAC Rating power 1800W Resistance 29.265±1.463Ω Thermastat1 98℃ Thermastat2 229 ℃ - 13 -

• Delfa WQP12-9242B, Inspect Flowmeter 1.Open the control panel and take out PCB; 2.Unplug the CON27 wire(shown in below picture), then use the multi-meter Diode shelf to test whether electrical pulse is sent out from two black wires while water is passing through flowmeter, or not. 3. If there is continual electrical pulse, the multi-meter will send out sound “de” continually. 4.if there is no electrical pulse, the multi-meter will not 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 breake

• Delfa WQP12-9242B, Safety hose Theory of parts-> Inspect Safety Hose Access Safety Hose clamp bound belt wire connecter (no need to di stinguish positive and negative electrode) clamp ring 1. Remove baseboard, side baseboard, top panel and left side panel. 2. Remove clamp, cut the bound belt and disconnect the wire connector. Then the Inlet hose cane pulled out. 3. Reverse the above procedure to assemble. Electronic Aquastop Hose Mechanical Aquastop Hose Mechanical Aquastop hose is connected to appliance 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 measur

• Delfa WQP12-9242B, NTC Theory of parts-> NTC Bottom View Location of NTC The work principle The work principle Negative 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 - 18 -

• 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 ma

• Delfa WQP12-9242B, Procedure ->Test Program No. Process 0 Initialization 1 Inlet Valve 2 Washing Pump and Dispenser 3 Heating Element 4Drain Pump 5 Pause 6 Inlet Valve 7 Washing Pump 8 Pause 9 Washing pump 10 Drain Pump and Regeneration Valve 11 finish Power on, stand by Open inlet valve and feeds with 3.6L water(45cm models feeds with 3.0L). F* Buzz one sound, stop, and stand by. Dispenser will act once and washing pump will run for 60s in this step. Run washing pump and heating element until the water temperature reaches 57℃. Th

• Flowmeter Theory of parts-> Location of Flowmeter The work principle Flowmeter 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

• Delfa WQP12-9242B, Washing Pump Theory of parts-> Check the machine part 1. If the electric part is OK, we need to check the machine part. 2. Remove bottom board. 3. Check the pump assembly, if the bracket is loose, it will bring the noise, we need to tighten it. 4. If the wash pump cannot start and the machine hasn’t been used too long, maybe the seal element is bond. 5. If the drain pump is working, but no water out or just a little. We should check the vane wheel. Access Washing Pump 1. Disconnect power. 2. Remove bottom board. 3. Label and disconnect the 2 terminals to the capacitor. 4. Label and disconnec

• Delfa WQP12-9242B, Error Code Test program-> E4 Overflow In test program, once open-circuit failure of thermistor is detected by controller, the E6 would occur. When E6 occurs, the drain pump will run until flowmeter keep motionless for 2 minutes ( 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 6 will be shown. E6 Open-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 dr

• Delfa WQP12-9242B, 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 wat

• Delfa WQP12-9242B, Inspect heater 1. Remove bottom board. 2. Use the multi-meter Ω shelf to measure resistance between the two terminals shown in right picture, the resistance is about 29Ω to 31Ω. 3. If the measured resistance is not correct, it means the heater coil or the thermostat is broken, we should replace the heating element or the thermostat. Heater Theory of 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 He

• E2 tree Inspection-> 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. E2 code Longer drain time Some water Check whether the Drain Pump circuit is correct or not. (mentioned in section 4) solve the problem Not No water Is there any water in the Tub? Reconnect

• Delfa WQP12-9242B, NTC Theory of parts-> 15℃ 17.48KΩ 20℃ 12.12KΩ 25℃ 10KΩ 30℃ 8.299KΩ 40℃ 5.807KΩ 50℃ 4.144KΩ 60℃ 3.011KΩ 70℃ 2.224KΩ 80℃ 1.667KΩ 85℃ 1.451KΩ NTC Inspect NTC 1.Open the control panel and take out PCB; 2.Unplug 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

• 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. Process of cycle washing (indi

• Delfa WQP12-9242B, 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. - 10 -

• Delfa WQP12-9242B, Test Program Take 9241B for example, with the door closed and machine off, hold down the Rightmost Program button and press the POWER button until the machine enter into Test Program. The appliance will pause and stand by(as step 00). Then press Rightmost Program button to start the Test Program. During test program running, you can press Rightmost Program 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 ac

• E1 tree Inspection-> 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. E1 code Longer inlet time Make a check of Tap No water Not open Open it to solve the problem Opened Check whether the Inlet Valve circuit is correct or not. (mentioned in section 4) solve the problem Not Corr

• Delfa WQP12-9242B, E4 tree Inspection-> E4 Overflow Is there any water on the bottom board? Make a check of Flooding Switch circuit(normally closed) solve the problem Reconnect the wire of Flooding Switch circuit and check again OK Still wrong Repair or Replace it to solve problem No water Check whether Flooding Switch is blocked or not Blocked Failure Make a check of Drain Hose Some water Drain Hose is kinked or blocked Solve the problem Failure Failure OK Check whether the Pressure Switch(83/63) circuit is correct or not. Reconnect the wire of Pressure Switch circuit and check again Not solve the problem OK Replace the Pressure Switch to solve problem Still wrong M

• Delfa WQP12-9242B, 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. S 08 1 2 on Off Access PCB 3. Disconnect the connector form PCB. 4. Remove the s

• Delfa WQP12-9242B, Error Code Test program-> 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. At the same time, the buzzer will alarm for 30 seconds and error 1 will be shown. How does the appliance react when error code occurred For the models controlling water filling by flow meter. If

• Delfa WQP12-9242B, 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. 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 o

• Delfa WQP12-9242B, Drain Pump Theory of parts-> Check the machine part 1. If the electric part is OK, we need to check the machine part. 2. Remove bottom board. 3. If the non-return valve is wrongly assembled, the tub will remain much water. We need to re-assemble the non-return valve. 4. If the drain pump is working, but no water drain out or just a little. We should check the drain hose or drain body. 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.

• Delfa WQP12-9242B, E3 tree Inspection-> E3 Longer heating time Check water temperature in the tub Low Check whether the NTC circuit is correct or not.(mentioned in section 4) High Not Make a check of over heat proof heating Micro-switch. Replace Switch to solve the problem Failure OK Make a check of Heater. (mentioned in section 4) Failure solve the problem Reconnect 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) Recon

• Delfa WQP12-9242B, E6&E7 tree Inspection-> E6 Open-circuit failure 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 E7 Short-circuit failure 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

• Delfa WQP12-9242B, washing pump pressure switch drain pumb drain hose over flow switch air breaker inlet valve inlet hose Regeneration water route upper spray arm top spray tube Inlet water route lower spray arm softener Water circuit scheme regeneration valve Cycle water route Drain water route Water Circuit Function Description-> - 3 -

• Delfa WQP12-9242B, 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 applies to 9378A 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 - 7 -

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