Question about Whirlpool GH7155XHS Microwave Oven

1 Answer

My whirlpool microwave humms even when i'm not using it

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  • shuewebb Jan 04, 2009

    I have had the microwave unplugged for hours at a time because of the annoying noise and fear of fire or further damage. I had a hint that it might be a bad diode after the capacitor making the transformer humm. The only thing is that they said that the microwave wouldn't heat and mine still does. Any thoughts?

  • shuewebb Jan 05, 2009

    You're right, the microwave heated a cup of water without setting the timer or pressing start. It also had a burning smell when I took the cup out after about 2 min. The model is a Whirlpool gh7155xkt-0 serial#fgl4501727. This is great! What should I do next? If it can help I am an electrician and can test components with your help. Thanks again.

  • William Miller
    William Miller May 11, 2010

    If you haven't done so already, I would suggest putting a cup of water inside to see if it's possibly heating when it's not supposed to.

    If it's running when it shouldn't, that would be caused by a problem on the controller or a door switch or mount, not the high voltage diode.

    Sorry, but I forgot to ask your full model number from the tag / label on the unit..


  • William Miller
    William Miller May 11, 2010

    The
    first thing I would suggest is a hard reset. Unplug the unit for a
    minute or so. Then plug it back in, set the clock and try again.




    If that doesn't work,
    leave it unplugged for maybe an hour. Then let us know if the hard
    reset does not fix it.

    You may have a bad filter capacitor on the control circuit board.

    We
    regularly repair such control units for customers nationwide by mail
    for $39.95 postpaid in about a week with a one-year guarantee.


    Please reply back with
    your full model number from the tag so we can help you
    properly.




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  • Whirlpool Master
  • 8,820 Answers

It's almost certainly a shorted cook relay on the control board.

The relay has two metal tabs on top where the wires are connected.

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.

Be sure the oven is unplugged, then you can measure across the two tabs and I think you'll find the tabs are shorted.

A new board for this model runs over $150, but
we regularly repair such control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

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

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

Posted on Jan 05, 2009

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3. High Voltage Capacitor.This is the Silver Can with the two terminals on top. It can SHORT internaly between the plates (the two terminals) and give the "HUMM".
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