Question about Whirlpool MH1150XM Convection/Microwave Oven

1 Answer

Our 3 yr old microwave operates totally normal, with the exception of it quit warming today.

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  • jaredwoodruf Jan 04, 2009

    The model is MH1150XMS-2. Everything sounds normal. The light and the turntable work as usuall as well. You can even hear what appears to be cooking off and on during lower settings, which was normal, but there's absolutly no heat at all even on high settings. All sounds are totally normal. The door stops the operation and the display seems to work normal too. As far as I can tell, the only thing affected is the lack of heat. Could it be a simple fuse inside?

  • jaredwoodruf Jan 08, 2009

    I found the links and etc. great. Fortunately the problem wasn't any of the components. I tested each one and they all were ok. But when I went to remove the magnetron, I noticed the wire connector was extremely loose and a little corroded. I cleaned and tightened the connector. Put it back together and voila!!! It works. Thanks for all the help. I'm sure it would have been a pain without it. : )

  • Anonymous Jan 10, 2009

    whirlpoolMH6150XLT No heat, but everything else works.

  • chrisregula Feb 04, 2009

    whirlpool mh1150xms-4 no heating

  • matthubbell Mar 06, 2009

    Our Microwave is about 4 yrs old and doesn't heat. Last night during normal operation, we heard a loud noise and stopped the unit. When we turned it back on, it wouldn't heat. Everything else appears to work fine. It even sounds like it's going when we start it.

    Also, I noticed someone else posted an issue with the fan coming on whenever the unit is on. We've had the same problem for a year and just ignore it. Would be nice to have that resolved as well.

  • William Miller
    William Miller May 11, 2010

    When you hit Start to
    cook, do the inside light and turntable come on?

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

    What is the model number?

    These answers will help
    me judge whether it's in the high voltage
    section (magnetron, transformer, or diode) or the control section
    (door switch or control board relay or connection).

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



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  • Whirlpool Master
  • 9,086 Answers

It won't be a fuse.

With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron, or a loose and possibly corroded connection on the magnetron's terminal.

The diode is a fairly cheap fix, and the mag will cost more.

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.

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.

If you don't find yours, or if you want to look at it without disassembling the oven, you can download it here. Enter your model as "MH1150XMS2" with no dashes.

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

Here are some links you or someone you know can use for test help, but read their safety warnings first:
(if it's not shorted or burned, it's probably okay)

To test or replace the parts, you will probably need to remove the oven from the wall.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download Whirlpool owner's manuals and installation instructions here.

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

Posted on Jan 04, 2009

  • William Miller
    William Miller Jan 04, 2009


    I also meant to say that since it's less than 5-9 years old, the magnetron would still be covered under warranty.

    it's within the magnetron portion of the warranty (usually 5-9 years)
    but out of the original full warranty (usually 1 year), then your
    manufacturer will cover the part cost, but not the cost to visit you or
    the labor charge to do the work.

    Whirlpool customer
    service is
    here and they may send you a magnetron (if needed) to install yourself or for a service tech to install.

    nothing else, you can save about $75 by taking it to the shop yourself.

    Again, you can
    download Whirlpool owner's manuals and installation

  • William Miller
    William Miller Jan 08, 2009

    As i said, "or a loose and possibly corroded connection on the magnetron's terminal."

    But I would not count on that fix to last if it's not very clean and tight.

    If it was too badly corroded we will cut the connector off the wire, strip the wire, run it through the hole in the terminal, twist it and solder it.

    Would this rate a FixYa rating from you?

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



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