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Microwave oven heats sporatically.

I have a over the stove Frigidaire microwave (model FMV156DCA) that will heat normally for several cycles, then then next time i go to use it, it will not heat.  For a few weeks i was able to unplug the unit for 30 seconds, and it would then work again.  But now that is not even working.  I checked continuity on the door switches and they seem to be normal.  Anything else to check?

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  • 2 more comments 
  • drsutter Dec 02, 2008

    The Turntable and fan always come on and stay on.  It's not a situation where it starts to heat and them stops in the middle of a cycle, it either works the whole cycle or not.  Lately, it doesn't heat at all, but still the fan, turntable and light all work. 


    Thanks
    Dan

  • drsutter Dec 06, 2008

    Nothing unusual with the noise, normal sounding.

  • William Miller
    William Miller May 11, 2010

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


  • William Miller
    William Miller May 11, 2010

    When you hit Start to
    cook, do the turntable and cooling fan always come on?

    When you encounter the "no heat" situation, do
    the turntable and cooling fan run, or do they stop?

    How about the inside light?

    I think I may know
    what's wrong, but I want to be sure.


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  • Microwave Ovens Master
  • 8,820 Answers

Since you say it sounds normal, the first thing I would suspect is a loose / corroded connection of the "FA" (right hand) terminal of the magnetron.

The photo I've attached is a worst case scenario, but even if the terminal is a little loose, it can cause a "no heat" condition.

If it's not too charred or corroded, it can be squeezed with pliers to tighten it. If it is too far gone, the solution is to either install a new connector or solder the wire directly to the terminal. But in either case, the metal must be clean and shiny.

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.

We have the service manual for this model and have uploaded it to our site here to help you.

You will need the
free Acrobat Reader to view or print it in case you don't have it already.

There should also 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.

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

If it's not the magnetron, then the next suspect would be a bad connection elsewhere in the high voltage.

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

Microwave oven heats sporatically. - f8e3043.jpg

Posted on Dec 06, 2008

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