Question about Whirlpool MH7140XF Microwave Oven

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Gh5184xp no power

While boiling water, on the stove top, with the exhaust fan on the unit went dead. Power to the unit is good. Also can not find service manual on-line. Please help.

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There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very 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.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

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

The fuse and magnetron thermostat can be checked without pulling the oven form the wall.

But if you need to check the cavity thermostat, the oven will need to be removed from the wall, and it helps if you still have the installation instructions.

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.

Posted on Oct 24, 2008

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If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

An overheating magnetron can be :
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  • wrong magnetron installed in oven
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I suspect a failure or the fan, clogged filter or bad magnetron.

I appreciate your thoughtful rating of my answer.

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