Question about Kenmore 62643 Microwave Oven

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Kenmore 721.80523 Hello, I choose the Kenmore 62643 because is the one that is similar to my microwave oven. The problem I'm having is that the microwave is not heating the food and it makes a weird sound. Actually it's kinda scar sound.. I don't have my camera now but Probably i will post a video (if I can)....Any suggestions? The Microwave came with the house when I got It....but it seems that the warranty expired...:(

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  • Eduardo Perez
    Eduardo Perez Jun 30, 2008


    This is a small video on how the microwave behaves.....

    It's possible that I can change those things myself? I have some experience with computers :)

  • Eduardo Perez
    Eduardo Perez Jun 30, 2008

    sorry I forgot to add:

    -I did not noticed any 'burning smell'; the hood works fine...

  • Anonymous Jan 31, 2009

    exact same problem! had a master electrician take the whole thing apart. there is some piece that you can't get to that is causing this and i need to get a parts list to see what it is and if it can be replace. i've not used my microwave for over 2 years because of this. there is a plastic piece that says 'remove only for service' - this is where the noise & burning is coming from. we could see it lighting up (not normal). will report back!



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Is there any burning smell after you try to heat with the microwave?

In most cases of no heat with a loud noise, it's a bad high voltage diode or magnetron.

Posting that video may help if you get the sound clearly.

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

Posted on Jun 29, 2008

  • William Miller
    William Miller Jun 30, 2008

    Okay, that sound is arcing. Good job on the video!

    Have you removed the waveguide cover at the top of the cooking area yet?

    You can get it off probably by pulling the rivet, then turning the cover and pulling it down. Your manual will cover that.

    You should then run it without the cover to see if the stirrer is turning. If not, it will not heat right and it will arc.

    That would probably mean you need a stirrer motor.

    Another thing that will make it arc is food or grease on or behind the stirrer cover.

    If the stirrer is running and there's no grease buildup arcing, then my last suspect would be the magnetron, which should have a 5-9 year warranty.

    If it's out of the 1-year full warranty, you would have to pay Sears for labor. You can save money by taking it to the servicer yourself.

    Please let me know what you find out.



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