After power on buzzer is on and drain pump runs no lights on panel except buzzer and when buzzer switch pressed buzzer silenced but no lights and pump still runs. have checked inlet filters and sump switch seems to work properly.
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It is difficult to answer the question with so few symptoms. The question would be whether the pump stops when you open the door? If not, then should checked for correct door switch, otherwise I think you need to replace the main board. If you see diagram bellow you can see that the motor is driven by the triac which is probable remain in the open position and constantly power supply motor. Some model has relay which switch between wash motor and drain motor and there is possible that relay stuck and motor also running constantly.
You should be able to access the clock from the back panel. Make sure the power is off and you can disconnect the power to the clock motor. Tape off the wire to prevent it shorting out against the case. generally the white wire is the neutral and can be safely disconnected without affecting the clock operation of the oven. Some clocks also control the oven operation. Make sure that you are not disconnecting this feature.
Remove power to the microwave for few minutes, press down all the front panel buttons to drain off residual voltage so as to reset the processor or memory.. If the fault repeats, try to shut off power overnight , if not there is error on the processor to output the buzzer.
A beep tone will activate when selecting the HWS buzzer alarm. The alarm beep will become shoter and shoter every 15 seconds for one minute followed by one minute silence before repeating the cycle. The HWS alarm will sound for one hour until turning off by pressing the Power button. Press the Power button whilst the alarm is activated will cancel the alarm for 24 hours. 1. The HWS buzzer alarm can be set either radio is on or off. 2. Press and release the HWS buzzer alarm button , the symbol will flash. 3. During the symbol flashes, long pressing the button for more than 2 seconds followed by a beep and display Hour digit will flash. 4. Rotate Tuning Control to select required alarm hour, then press time set button again. The minute digit will then flash. 5. Rotate Tuning Control to select required alarm minute, the press time set button again to complete HWS buzzer alarm setting. 6. Press and hold down buzzer alarm button for more than 2 seconds followed by a beep to switch on or off the HWS buzzer alarm. Display will appear when buzzer alarm has been set.