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Whirlpool Over the Range Microwave won't heat

This is the second time the heat stopped working on our microwave. It was built in 2004 and have had it fixed once before, but is no longer under warranty. Could I fix this myself? The model # TRR4273020.

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  • 4 more comments 
  • ked0603 Jul 29, 2008

    The model number is MH11500XMB-1

  • ked0603 Aug 04, 2008

    The turntable and light do work when I try to cook.....One important thing I forgot to mention is it stopped heating when I adjusted the power level on the microwave.



    I don't know what was replaced before when it was fixed, but it was only 3 months old when it went out.



    Katie

  • ked0603 Aug 06, 2008

    Can anyone help me?

  • onegr8scorpi Sep 02, 2008

    replaced light underneath microwave without unplugging the unit. the light bulb exploded in my hand. replace bulb, now unit will not heat, the display still works. removed circuit board from behind display and found a burnt trace to a black relay. solder on wire were burned trace was and still having the same problem. it might be the circuit board, but i'm not sure, any suggestions.



    bryan

  • William Miller
    William Miller May 11, 2010

    Okay, that's better. MH1150XMB-1 I would say.

    Are the turntable and inside light coming on when you try to cook?

    What was replaced before to fix it?

    Feel free to contact me directly.

    William E. Miller
    prototech@usa.net
    http://www.microwavedisplay.com



  • William Miller
    William Miller May 11, 2010

    That model number isn't showing up. Is it a US model?

    Can you double check that?

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  • Microwave Ovens Master
  • 8,871 Answers

Yes, I'm trying to help you. Sorry about all the questions, but it's part of diagnosis.

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose or corroded connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron
- shorted high voltage diode

At this point, it seems pretty clear that the problem is in the high voltage section, most likely the magnetron, but possibly the high voltage diode or transformer..

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

http://www.gallawa.com/microtech/diode.html
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 Aug 06, 2008

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