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Microwave not heating unless exhaust fan is on high

I have a Maytag combination range hood/microwave. It's 5 years old. Recently it started not heating from time to time. Even more recently it wouldn't heat every time. Yesterday I figured out that it works perfectly if I turn the exhaust fan on high. Low does not work. In fact if I turn the microwave on without the fan on high I can hear it not working but as soon as I turn the fan on high I hear the humm start up.

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Re: Microwave not heating unless exhaust fan is on high

Check the control unit and high voltage circuit, and megnetron, high voltage diodes, wiring and high voltage fuse etc.,

Posted on Sep 27, 2007

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