Question about Whirlpool MH7140XF Microwave Oven

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Whirlpool model number MH7140XFB no longer heats

Whirlpool microwave over model number MH7140XFB no longer heats up food when operating. It was purchased in 1999. The light turns on, the turn table rotates, and it sounds like it is operating properly but the food does not heat up. What is the replacement part needed to fix the unit and how much will it cost? I'd like to compare the cost of repairing the microwave verses purchasing a new one.

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You either need a new h.v. capacitor or h.v. diode in the magnetron circuitry if you cant hear it cycle when it runs as in a low pitched hummmm when its drawing current to operate the magnetron tube, each part runs about $30 to $45 each,normally its the h.v. capacitor though

Posted on Jul 28, 2010

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Posted on Jan 02, 2017

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1 Answer

Where is the fuse for whirlpool microwave MH7140xfb-1 -


The support page for model MH7140XFB1 is here. Your exploded view with parts list is here.
There is a bulletin about door switch (interlock) support holders here.
It may or may not apply.

If a fuse is blown, it can blow for many reasons, and not every problem blows a fuse.

For disassembly info, you can watch the video at this site, or see these text files: http://www.microwavecontrol.com/safety.txt
http://www.microwavecontrol.com/disassembly.txt

Unfortunately, the door handle is not available separately. You would have to order the entire door assembly.

It is part number DE94-01381J and it runs $106.99 from Sears here. (prices subject to change)

William E. Miller
http://www.MicrowaveControl.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

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My Whirlpool microwave model MH6130XEB-1 made a pop noise and now will no longer heat food. Everything else works fine, clock, timer, fan, turn table, etc. Is this a fuse problem?


It can be the fuse supplying the magnetron, or the magnetron itself which has failed. Another suspect is the high voltage capacitor in this circuit.


Don't try to fix this yourself as the internals of a microwave are dangerous, with high voltages even when unplugged.

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all microwaves have a magenetron which produces the heat. if this is gone and it is not under warranty, it is not cost effective to repair. check you manual, most mag's have a 3 - 5 year warranty.

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There is an internal fuse. The cause for it blowing will have to be determined.
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Microwave seems to be working ok,but not heating food My micro wave is operating with the exception of the following: it is loud. it is not heating/cooking the food there is a metallic order when...


Chances are you have a shorted high voltage rectifier diode or a bad magnetron, but it may be a bad high voltage transformer.

There should be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which isvery helpful when troubleshooting & testing.

At our site, we have a video showing how to remove a typical over the range control panel assembly in under 5 minutes.

You can usually 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 (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

If you'd rather have a pro take a look, I would recommend that you contact Whirlpool customer service to find your nearest Whirlpool-authorized service center.

Whirlpool customer service is here and you can also enter your model number on that page to download your owner's manual, installation instructions, etc..

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

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