Question about Whirlpool MH1140XM Microwave Oven

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Microwave stopped working for no reason

I have a whirlpool microwave oven that just simply stopped working a week ago. The model number is below
MH1140XM 900 Watts Microwave Oven

Please advice

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  • Whirlpool Master
  • 8,820 Answers

A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.

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.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

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 (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

At our site, we have a video available 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.

There should also 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.

If you don't find your tech sheet, you can download it here.

If the cavity thermostat needs to be checked or replaced you'll need to pull the oven from the wall.

You can download Whirlpool owner's manuals and installation instructions here.

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

Posted on Nov 23, 2008

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In some Whirlpool models, there are more than one fuse, and two or more thermal devices which can interrupt power to the oven.

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.


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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.

If you don't find yours, or if you want to look at it without disassembling the oven, you can download it here.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

Please write back with more details if you need further help.

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

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Buttons #3 & 8 on control panel not working


Sounds like your keypad has failed and you need the fan circuit repaired on the control panel.

We regularly repair these control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

Add to that about $75 for the keypad.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

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