Question about Whirlpool MH7140XF Microwave Oven

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WON'T LIGHT UP

Upon opening the door to my microwave, I heard a click and the instrument panel went completely out. I checked to see if the fuse had kicked off but it hadn't so I don't know what the problem is. However, nothing works on it....fan, lights, keypad

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  • kdurham04 Jan 14, 2009

    i checked to see if the fuse had kicked off but it hadn't......

  • Anonymous Mar 03, 2009

    I opened the door to my microwave and everything went blank. We tried resetting the breakers, but they weren't off. A time or two, it came back on and then went out again when we opened the door. Seems like it may be a short, but we aren't experienced in this type problem.

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Did you check the fuse box?

Posted on Jan 13, 2009

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Parts are available on the Net, and you can get the P/N's off the old components to identify suppliers of the new ones.

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If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

But you might replace the fuse and do another quick heating test to see if it blows again. If so, you'll need to do some checks.

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/xformer.html
We're happy to help and we appreciate your thoughtful rating of our answer.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

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Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

If you someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

There should also be a very helpful "mini-manual" hidden inside the unit behind the control panel. It's very helpful when troubleshooting.

You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

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

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This is usually caused by either a bad door switch or a loose door switch mount.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

There should also be a very helpful "mini-manual" hidden inside the unit behind the control panel. It's very helpful when troubleshooting.

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

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