Question about Maytag MMV4205 Microwave Oven

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My Maytag MMV4205 Microwave Oven runs but does not heat

Everything on the microwave works, except it does not heat.

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  • jon4611 Dec 13, 2008

    I have the same microwave doing the same thing. It is a Maytag MMV4205BAW. To all appearances it is working normally, the light comes on inside, the control panel "buttons" all work, the turntable rotates, and the cooling fan comes on, but it does not heat anything. Could this be a defective design or manufactured with defective parts?

  • james_dickso Dec 15, 2008

    The inside light and turntable come on and it sounds like it always has. The model number is MMV4205AAW and the serial number is 10127252GA. It was manufactured in January 2005.

  • jneubert Jan 31, 2009

    Everything works on the microwave except it will not heat.

  • dana123 Feb 09, 2009

    WE HAVE THE SAME PROBLEM.. runs fine but will not heat everything.. maytag MMV4205BA

  • Anonymous Feb 23, 2009

    microwave works normally as far as turntable, timer, lights, fan, etc. except it doesn't cook the food at all. Started all at once. Working fine just a couple of hours earlier & then just stopped cooking.

  • jamesdcorder Mar 02, 2009

    The microwave turns on and appears to operate normally, but the food does not "cook" as it did before. Sometimes it does not warm the food at all.

  • RJCTECH Mar 07, 2009

    I have the same problem... Model MMV420AA



    and i took it in to get repairsNovember of 07 and had a blown mag .. at that time was covered under warranty... however the problem at that point was more severe was totally dead. No sure what to do with this... Seems like this is going to be expensive to repair... Might be time to get a new Microwave and DUMP the maytag Brand!

  • 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?




    Do you have the model number?

    These answers will help
    me judge whether it's in the high voltage
    section (magnetron, transformer, or diode) or the control section
    (door switch or control board relay or connection).




  • Anonymous Mar 30, 2014

    Everything seems to work except it doesn't heat the food. The touch pad functions and so does the clock and fan, but the oven does not produce heat

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  • Maytag Master
  • 8,871 Answers

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.

If you don't find yours, or if you want to look at it without disassembling the oven, you can download it 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, it's probably okay)
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

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

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

Posted on Dec 15, 2008

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