Question about Whirlpool MH7155XM Microwave Oven

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Fuse location on wall mounted Whirlpool MH7140XFQ

Need SPECIFIC instructions on how to locate and check the fuse on the above listed model. I cannot get to the back of the unit without removing it from the wall.

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  • Rafael Rivera May 11, 2009

    my microwave is not heating wath will be the problem its the magnatone or something else model mh7140xfq-0

  • Anonymous Mar 19, 2014

    remove from the wall mounting bracket

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  • Whirlpool Master
  • 8,820 Answers

The fuse is in a holder located behind the control panel assembly.

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

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 yours, you can download it here.

If the oven is dead, it may also be a bad magnetron thermostat or oven cavity thermostat.

The first one can probably be accessed through the opening behind the control panel, but the oven cavity thermostat cam only be accessed by removing the oven from the wall, then removing the outer cover.

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

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

Posted on Nov 23, 2008

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1 Answer

WHERE IS THE FUSE ON THOSE MODELS NN-SD277 MICROWAVE


If mounted on the wall above the range, this may be a 2-man job to remove, and the electrical repair may not be for DIYer. 1st ask "Why is fuse bad?" Usually the fuse is located with other electrical/electronic components behind the control panel. To access: unplug, remove MW from wall, remove bonnet (3-sided metal shroud), expose the electrical compartment on the right side, search for the fuse (usually 1 1/4 x 1/4D cylinder). Replacing the fuse may not be the final answer.

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You will need to remove the oven from the wall.

The installation instructions will show you how, and it's best to have two people since the microwave can be heavy and awkward.

If for some reason you don't still have yours, you can download Whirlpool owner's manuals and installation instructions here.

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

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.

mini_manual_behind_grille_small.jpgdee77f7.jpgAt our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

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

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It may be the fuse or the thermal cutout / thermostat associated with the magnetron.

You say you have the service manual? If you mean the folded-up "mini-manual" that should show the relative locations of the parts in a perspective view.

Also, you can find exploded views at the Sears parts site.

Looking at the "interior parts ii" exploded view here, it shows the fuse (drawing reference # 5001) on the small RF noise filter board located on top of the air duct assembly.

You'll need to remove the oven from the wall to get to it for testing & replacement.

The installation instructions are handy to pull the oven from the wall.

If you've misplaced yours, the Sears site may have them free.

You can just enter your full model number at the Sears parts site.

On the resulting page, look to the right for the blue "View manuals" button. Click there.

caab351.jpg

That Sears-related site has many free manuals. While the manuals they list there are all free, they may ask you to register.

Many times, the owner's manual will have the installation instructions inside.

If yours is not listed there for free, you would have to order it through the
Sears parts site.

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


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Before you go that far check above the hood and see if you can locate the plug end of the microwave. Most installations have a dedicated receptacle above the exhaust vent and microwave. It is usually a space too small for good storage so most housewives store small items and cookbooks in this space. It is usually the culprit for a microwave suddenly going out without someone placing metal inside the oven and heating it.
Heating a metal object or operating a microwave for an extended time will usually blow the fuse.

r_craig@basicisp.net

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1 Answer

No display, no light, no fan, microwave dead!


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.

It may be the fuse, which is located in the upper area behind the control panel.


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.

(Don't be confused by the base or hood thermostat, which is on the floor of the chassis. It will read normally open).

The fuse and magnetron thermostat can be checked with out taking the oven down from the wall, but if you need to check the oven thermostat, you will need to pull it from the wall.

To help with that, you can download Whirlpool owner's manuals and installation instructions here.

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

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

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

Nov 25, 2008 | Whirlpool MH1140XMS Microwave Oven

1 Answer

Owner


Check the internal fuse. Unplug it, unscrew and take off the cover, the fuse should be easily found in the back by the power cord. It looks like a regular fuse but is white instead of clear glass because microwave fuses are special. You'll have to measure it with a meter as a result and be sure to replace it with the same kind. (try finding them at radio shack) Hopefully there isn't something more serious also.
Hope ya fix it!

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Small fire in above range microwave, now completely dead.


It probably put too much heat in the "innards" of the microwave and probably opened the thermostat or thermal fuse located inside -either on the chassis of the microwave or or the magnetron. If you or a friend is handy and wants to check and replace it, it's not a hard job as long as you play it safe. It will look something like the attached photo. In my profile you can find a link to my site where you can find critical safety & disassembly tips. There will be numbers on the side indicating the temperature and you can take the old one to a local appliance parts store to get a new one. NOTE: The one for the hood fan will read open at room temperature, so don't confuse it with the other two thermostats, which will read closed at room temperature. Post back if you need more help.

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