Question about Whirlpool MH7140XF Microwave Oven

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My microwave is making a humming noise when plugged in and the fan continues to run when not in use what is wrong?

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Is the turntable rotating?

I suspect a jammed motor drive and a short circuit in this situation. I would be seeking a quote for repair and not trying to use it incase it over heats and catches fire. The continuos running of the fan is a definite worry Unplug it before touching it in case some parts of the case are live.
Please rate my help++++Thanks for using FIXYA

Posted on May 07, 2010


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if it is a humming sound and not a motor or fan u probably have a bad magnatron or power supply component causing a heavy load.

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When the microwave is plugged in but not running there is a buzzing/humming noise.The unit works fine and the buzzing/humming continues when in operation as well.

That noise you hear is loose laminations in the standby/controll transformer. It is no more than a nuisance.
The transformer can be replaced by contacting the manufacturer and browsing for a dealer near you.
Hope that helps.

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Is this a new or used unit, and is the humming sound new? Can you watch the fan blade go around or is it going too fast to watch a blade?

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