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Microwave has loud buzz and does not work

Kenmore model # 665-69619990

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  • Anonymous Feb 03, 2009

    Sometimes it makes a terrible buzzing sound and sometimes not. When the repairman came, it worked well with no noise.

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  • Microwave Ovens Master
  • 9,098 Answers

It's probably a shorted high-voltage diode or magnetron, but there's some chance it's a bad high-voltage transformer.

If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

You can probably find an exploded view and order parts by entering your model number here: http://www3.sears.com

Posted on Nov 18, 2007

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There's no heat, but it buzzes loudly When the microwave won't heat, but you hear a loud buzz, you usually have a defective power diode, high-voltage capacitor, or magnetron. I recommend that you consult with a qualified appliance repair technician for help in determining the problem and deciding what to do about it.
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Kenmore microwave making loud buzzing sound.



We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.


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Have seen this many times.

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Since yours is making the loud 60hz buzz you need to replace the capacator that will likely fix the problem. A $10 fix

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It's likely a bad magnetron or maybe the high-voltage transformer. If it's within the warranty period of the magnetron (5 years or less), I would call Sears. In my professional opinion, no one should work on a microwave unless they are fully informed and aware of the deadly hazards and necessary precautions. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your full model number (without the suffix) here: http://tinyurl.com/gv383

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