Question about Maytag M7DH45B2A Dehumidifier

Will not power on after the electricity came back on in the house!

The power goes out during storms and when it is restored the unit has to be turned on again by pressing the power button. This time it would not turn back on. It may have been zapped with a power surge. The unit has worked well for several years with the power going off and on without a problem. This time when the power button is pressed, the digital display flickers and goes off. No combination of button pressing results in the machine coming on. I have replaced the pc board with the power button and the display but it did not fix the problem. What tests do you suggest? I have a multimeter. I assume that the capacitor is there to start the motor so I did not discharge nor test it. I have not checked the power supply for output. Any suggestions are appreciated.

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105 Answers

That capacitor is a run cap for the compressor. Your problem sounds like a faulty connection in the circuit which supplies power to the solid state electronics. The electronics will have a 115 VAC supply from the rest of the machine's circuitry, most likely running to a small transformer. Check for 115VAC when you attempt to start the machine. Trace the circuit until you find the point where the power disappears when the start is pushed. If this does not reveal the problem, replace the board that has the transformer on it. There is a faulty connection somewhere which is opening when power is drawn. It is also possible that the compressor is locked & drawing enough power to disable the rest of the machine. Try it with the compressor disconnected, before replacing anything.

Posted on Jul 17, 2007

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