Question about Whirlpool MH1150XMQ Microwave Oven

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Whirlpool microwave oven

I have a customer that has a otr microwave oven model number mh1170xsb-0.
her fan stays on when the microwave is done cooking, and will stay on .

she will have to unplug the oven to stop the fan until she wants to cook again.

i believe she said that there is an error code saying that there is a short.

i tried to call her back to varify that , but she was not available.

im tring to get as much info as possible before i go out to repair.

thanks.......Robert

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I have a nice PDF version of the technical sheet from a model MH1150, which should be similar. It's here:
http://www.microwavedisplay.com/whirlpool_mh1150xmq-0_wiring.pdf

Looking at that, I would say the fan relay "on/off" is stuck.

If your shop doesn't do board-level repair, we do it for $39.95 nationwide. You'll find a link to our site in our listing here on FixYa: http://tinyurl.com/yzjozk

If you'd like to discuss this further, please e-mail or call me via that link.

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

Posted on Feb 19, 2008

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1 Answer

Whirlpool mh1170XSB-0


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The "negative temperature coeffecient" (NTC) thermistor was left unplugged after reassembly or it is defective.

It is the hood thermistor, and should be plugged into connector P4 on the circuit board.

I think it should be at the bottom of the board, on a little tongue-like protrusion, as shown in the attached photo.

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.

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

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Whirlpool Microwave Oven Serial Number MH660XW-0


Hi Adam,
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Amana / Whirlpool customer service is here.

Please contact them to find your nearest authorized service center.

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

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I would suspect you have a bad door switch or door switch mount.

This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.

Even though a door switch clicks, it may still be bad inside.

This can be caused by slamming the door or by habitually 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

If you think the problem is on the control panel, which we repair these nationwide for $39.95 postpaid.

Please write back with your model number if you need further help.

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

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The most common causes for a lack of heating are a bad door switch, a loose connection on the magnetron, a bad magnetron, bad connection on the control circuit board, a bad relay on the board, bad high voltage diode, or bad high voltage transformer. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383

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