Question about Whirlpool MH7155XM Microwave Oven

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Microwave not working

Our Whirlpool Microwave (model MH7140XFQ) does not heat and makes a load humming when turned on

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  • steelers7 Jan 03, 2009

    My Microwave does the same thing. I figure it is a motor, just not sure how to fix it.

  • Anonymous Apr 19, 2009

    microwave will come on but willnot heat

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1 Answer

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  • Whirlpool Master
  • 19,396 Answers

Est the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

Thediode and capacitors can br tested. The capacitor must bealloweddischarge before testing, or you risk to get electrocuted, evenifpower is off. Capacitors can get discharged by shorting theirtwocontacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.



All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

Posted on Apr 27, 2009

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