Question about Whirlpool MH1150XMQ Microwave Oven

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Micowave sparks a fire

The back rack supports started sparking a month ago whenever I had the metal rack in it (the one that came with it). Now this week, it sparks regardless and actually starts a fire. I have flame marks up the side of the microwave. I've tried wiping it down and washing it and nothing works. The tried taking the rack support out and couldn't do that either. Do I just need a new microwave?

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  • Persephone78 Jan 25, 2009

    Same exact issue with sparking and flames except mine is happening on the front right rack clip. The clip itself is charred from the small flame and I don't dare use my microwave for fear of my kitchen catching on fire and burning my house down. My microwave was made in April of 2004, so it's not under warranty or anything. It's funny how much we can take something for granted until we just don't have it anymore. Please help.

  • charliered23 Mar 18, 2009

    I had the SAME exact issue on my model number MH1150XMB. The plastic tab on the metal rack caught fire and burned the side panel of my microwave. After searching the web I found that several other consumers had the same issue (extremely dangerous issue might I add). However Whirlpool refused to issue a recall. I think we need to come together on a class action. The sight of the fire alone has me afraid to use my microwave.

  • Heidi Shepard
    Heidi Shepard Apr 05, 2014

    I have the same problem and mine was made in 2012. I had heard the noise for awhile and though the food was splattering until I put my self at an angle where I could see the right front corner.

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I had the same exact problem. My clips arced when I ran the unit and I also observed flames which was quite unsetteling. A work around for me, since I don't use the rack was I took it out then removed the clips. All that was required to remove the clips was a pair of plyers grabing each cliip at their base. I pulled firmly and there is alittle resistance but with a firm pull straight out they'll pop out.

But I have to say if you use rack your probably looking for a new mircowave.

Posted on May 03, 2009

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  1. Waveguide coverSparking and arcing in a microwave can be caused by a damaged waveguide cover. Try removing the waveguide cover to see if the problem persists. Once removed, the waveguide cover can be inspected for burns, which will indicate if this is the issue. If the waveguide cover is burnt or will not stay in the proper spot it will need to be replaced.
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  1. Waveguide coverSparking and arcing in a microwave can be caused by a damaged waveguide cover. Try removing the waveguide cover to see if the problem persists. Once removed, the waveguide cover can be inspected for burns, which will indicate if this is the issue. If the waveguide cover is burnt or will not stay in the proper spot it will need to be replaced.
  2. Cavity/Rack supportIf sparking or arcing in your microwave is near a rack support, any exposed metallic area can be covered with a microwave cavity support. It is also recommended to replace the rack supports in this situation to ensure the issue is resolved.
  3. Cavity paintIf sparking or arcing in the microwave is visible on the side walls, the paint covering the metallic areas could have worn off or chipped. This can possibly cause pitting in the side walls or ceiling. If this is the case, it can be repaired with microwave cavity paint.

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Waveguide Cover

If the microwave is sparking or arcing the waveguide cover might be damaged and shorting out. Try removing the waveguide cover and see if the problem goes away. If there are any damaged spots in the microwave ceiling or sidewalls, repair them and paint them with microwave oven paint. Replace the waveguide cover if it is burnt or if it will not stay in place.


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If the microwave is sparking or arcing on the side walls the paint might have chipped causing pitting in the metal oven wall. Use microwave safe paint to touch up any bare metal spots.





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If the microwave is sparking or arcing near one of the rack supports, remove the support, repaint any bare metal, install a new support.

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  1. Waveguide coverSparking and arcing in a microwave can be caused by a damaged waveguide cover. Try removing the waveguide cover to see if the problem persists. Once removed, the waveguide cover can be inspected for burns, which will indicate if this is the issue. If the waveguide cover is burnt or will not stay in the proper spot it will need to be replaced.
  2. Cavity/Rack supportIf sparking or arcing in your microwave is near a rack support, any exposed metallic area can be covered with a microwave cavity support. It is also recommended to replace the rack supports in this situation to ensure the issue is resolved.
  3. Cavity paintIf sparking or arcing in the microwave is visible on the side walls, the paint covering the metallic areas could have worn off or chipped. This can possibly cause pitting in the side walls or ceiling. If this is the case, it can be repaired with microwave cavity paint.

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  1. Waveguide coverSparking and arcing in a microwave can be caused by a damaged waveguide cover. Try removing the waveguide cover to see if the problem persists. Once removed, the waveguide cover can be inspected for burns, which will indicate if this is the issue. If the waveguide cover is burnt or will not stay in the proper spot it will need to be replaced.
  2. Cavity/Rack supportIf sparking or arcing in your microwave is near a rack support, any exposed metallic area can be covered with a microwave cavity support. It is also recommended to replace the rack supports in this situation to ensure the issue is resolved.
  3. Cavity paintIf sparking or arcing in the microwave is visible on the side walls, the paint covering the metallic areas could have worn off or chipped. This can possibly cause pitting in the side walls or ceiling. If this is the case, it can be repaired with microwave cavity paint.

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Waveguide Cover




If the microwave is sparking or arcing the waveguide cover might be damaged and shorting out. Try removing the waveguide cover and see if the problem goes away. If there are any damaged spots in the microwave ceiling or sidewalls, repair them and paint them with microwave oven paint. Replace the waveguide cover if it is burnt or if it will not stay in place.

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If the microwave is sparking or arcing on the side walls the paint might have chipped causing pitting in the metal oven wall. Use microwave safe paint to touch up any bare metal spots.

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If the microwave is sparking or arcing near one of the rack supports, remove the support, repaint any bare metal, install a new support.

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