Question about Maytag MMV4205 Microwave Oven

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The power went out and resetting per book, only heat doesn't work

The power went out on the microwave and after resetting by unplugging and then power button, the microwave runs but there is no heat.We have lights, and the timer works fine.

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  • Dale Snoblen Jan 02, 2009


    1. model MMV405 BAS 110 watts

  • Dale Snoblen Jan 04, 2009

    The turn table starts and the light comes on. It sound kind of like a crackle hum. But not really sure if it is differant than before sound wise. Everything works except there is no heat.

  • William Miller
    William Miller May 11, 2010

    When you hit Start to
    cook, do the inside light and turntable come on?




    Any unusual noises? Is
    it louder or quieter than usual?




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  • Maytag Master
  • 9,047 Answers

We have a sound clip of what a microwave should sound like when the cooling fan and all are working here.

With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron, or a loose and possibly corroded connection on the magnetron's terminal.

The diode is a fairly cheap fix, and the mag will cost more.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

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

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
(if it's not shorted or burned, it's probably okay)


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

http://www.gallawa.com/microtech/xformer.html

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

Posted on Jan 04, 2009

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