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Microwave buzzing and hot when not in use

My microwave just started making a buzzing noise. It is not in use. Just buzzes until you open the door. Then buzzing stops. The panel on the right (where the food codes are) is really hot as is the glass on the door. It had not been used within an hour so it shouldn't be warm at all. I have turned off the breaker until it can be looked at. What is a possible cause?

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  • jarnoldholl Dec 05, 2007

    Whirlpool Gold, Model #GMC275PDB07 - Sept. 2003

  • Anonymous Jan 27, 2009

    microwave will randomly make high ptched noise like smoke alarm when not in use sometimes it goes on for hours

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  • Microwave Ovens Master
  • 9,098 Answers

The brand and model number can help us pinpoint it, but it sounds as though it is cooking.

It also sounds like the cooling fan is not running durng this error condition, which could overheat and destroy the magnetron.

I would suspect a bad door switch or door switch mount, or possibly a stuck relay on the control circuit board.

Please reply back with your brand and model so we can help further. Thanks.

Posted on Dec 05, 2007

  • William Miller
    William Miller Dec 05, 2007

    .

    .

    That works, thanks. I notice you rated the solution before I gave one. *grin*



    Checking the door switches would be the first step, then if you still have a problem, it's probably a short on the circuit board.



    If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and

    disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk



    There should be a very helpful "mini-manual" hidden inside the unit behind the control panel. It helps with troubleshooting too.



    You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383



    We're happy to help and we appreciate your thoughtful rating of our answer.

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