Question about Maytag Microwave Ovens

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I have a Maytag microwave MMV5156AAW. Just recently it doesn't heat and there is a loud humming noise. I figured it either the transformer, the magnetron or the HV capacitor. How can I isolate the problem to the specific unit??

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  • Anonymous Mar 13, 2014

    runs but won't heat

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  • Maytag Master
  • 8,820 Answers

It's probably the magnetron or high voltage rectifier diode.

(When a capacitor fails, it will short, causing the fuse to blow. They rarely "open up")

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

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

Posted on Jul 28, 2008

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