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How to replace thermal fuse/flame sensor

I was reheating food in our microwave this afternoon and it caught fire. The microwave shut off and now there is no power to the microwave. I assume after a little research that I need to replace the thermal fuse/flame sensor (is this the same thing?). However, I don't know where that is located. It is a Kenmore 721.80603. I went to the Sears website as directed but they did not have an exploded view diagram of this particular model. Can anyone help? Is this something we could do ourselves? Thank you.

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GE JES 1358 WK 01 microwave:
I recently had the same problem with a "flame sensor, " aka "thermal switch." My microwave is a "throwaway" model, very few repair parts available. I didn't want to replace it, so I did a little bit of research into thermal switches. I actually found one that would replace it for about $5 (plus $5 shipping).
Mine uses a "bimetal" thermal switch. There are three kinds of bimetal thermal switches: automatic reset, manual reset, and "one time use." The really interesting thing is this: the "one time use" resets (!!!) if the ambient temperature is below 0 degrees C, or 32 F (freezing); or, in some cases, -31 C, or about -22 F.
I put my "dead" flame sensor in the -10 F part of the freezer for about 20 minutes...
Checked it with my multimeter, and the once-dead sensor now read continuity (zero ohms)!!!
Reinstalled it in the microwave, and now it works fine.
So if you have a dead sensor- try freezing it...

Posted on Jan 23, 2009

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  • Microwave Ovens Master
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It may be is called a flame sensor, oven temperature fuse, oven thermal cutout, cavity thermal cutout,etc.

You should be able to find exploded views and order parts by entering your full model number here at the Sears parts site.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########.

You're missing the last three digits. Check the model number tag on the oven, not the manual.

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

Posted on Sep 26, 2008

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Posted on Jan 02, 2017

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My microwave is completely dead. I have checked the fuse in the plug and it is fine. Any suggestions?


Hello,

What you are to do to solve the problem is to do a general troubleshooting on your oven below are instruction to follow.

The Microwave is a counter top model with a variety of preset cooking options, including timed cooking at a variety of power levels and sensor-cooking settings for popcorn, rice, beverages and single-serving reheating.

The sensor cooking and reheating features detect increasing humidity levels inside the microwave and automatically adjust cooking time for various types and amounts of food. This microwave also includes a turntable and an electronic control panel.



Instructions below are step by step solution for your oven

  1. Check to see if the microwave will start. If it will not start and the display panel is blank, you may have a power problem. Unplug the microwave and then plug it back in, making sure that all three prongs of the power cord are fully inserted into the wall outlet. If this doesn't work, check your home's fuse box. Reset the circuit breaker to restore if necessary.
  2. Ensure that the microwave door is fully closed. Press the Clear/Off button to cancel any previous cooking instructions. Re-enter your cooking program, including cooking time and food weight if necessary, and press Start.
  3. If "Err" appears on the microwave display, press the Clear/Off button and reenter your cooking program. The "Err" message will appear during the sensor-controlled programs (Popcorn, Rice, Beverage or Reheat) if the door is opened before steam is detected or if no steam was detected within the maximum amount of time allowed by the microwave. Be sure to leave the door closed during these programs, at least until time is shown counting down on the display panel.
  4. If your control panel will not work or if an "L" is displayed on the screen, press and hold the Clear/Off button for a full three seconds to unlock the control panel.
  5. If your sensor reheat program is resulting in under- or overcooked food, first try decreasing the amount of food in the microwave; the sensor programs are designed for single servings of food. The sensor reheat function works by measuring humidity inside the microwave--do not use a tightly-covered dish with this setting because no moisture will be able to escape and the food will overcook. Be sure that cooking containers are dry; moist containers will increase the humidity in the microwave and mislead the sensor, resulting in undercooked food.
  6. If your turntable is not rotating, first check to ensure that your food container is positioned so that it can freely rotate without hitting the microwave's interior walls; using a smaller food container can fix this problem. If the turntable still will not rotate, lift the turntable from its support and replace it carefully, ensuring that it rests evenly on its support.
Good luck.

Thank you and thanks for using fixya.

Nov 23, 2010 | Neff H5470N0GB Microwave Oven

2 Answers

Paper caught fire in microwave. microwave power


check breaker in your home electrical panel...make sure all are on

Nov 08, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

I tried poping some popcorn in a brown paper bag and it caught on fire. I tried to the microwave again after i put the fire out and cleaned the mess up but nothing is working at all. No breakers were...


all microwaves have flame sensors that will cut the power in case of fire, this sensor will most likely have to be replaced. this will require you to drop the m/w and remove the case.

Jun 16, 2009 | Maytag MMV4205 Microwave Oven

1 Answer

My Frigidaire Microwave caught on fire


The owner's manual warns of the dangers of overcooking potatoes and similar foods and not to ever leave the oven unattended while it's running.

If for some reason you don't have your owner's manual, you can download Frigidaire owner's manuals and installation instructions here.

Are you looking for help to get your microwave working again?

Chances are it's just an opened flame sensor (cavity thermostat / thermal cutout / T.C.O.). Its job is to cut power if there's a fire.

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

Accessing some components for testing and possible replacement (like the oven cavity thermostat) will require you to remove the oven from the wall.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

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

Jun 07, 2009 | Frigidaire FMT116E1B Microwave Oven

1 Answer

Potato caught fire during cooking. Microwave has


Hello, inside most microwaves, there is a thermal fuse, that if something in the cooking cavity is on fire, it will melt the thermal fuse, if it gets hot enough, thus breaking the power to the unit shutting it off. This sounds like what has happened to yours, simply replacing it will correct the problem. It is usually located near a cavity exhaust point. If you aren't comfortable doing this, as it requires removing the outer cover, while unplugged, and locating/replacing it, take it to a appliance service co. This will of course cost more, if you do it yourself, make sure you provide all of your make/model/serial/anything else, that will identify your unit, and call/go online to a parts retailer, and you should be able to get it done fairly cheap.

Hope this helps, and thank you.

Mar 01, 2009 | Microwave Ovens

1 Answer

Model Jvm1440wh01


There should be a flame sensor (aka oven thermal cutout or TCO) located on the top left side or corner of the chassis.

You will have to remove the outer cover to find it.

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" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

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

Jul 27, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave caught fire


It sounds like a failed high-voltage transformer.

That oven retails for about $80 right now, so I don't think a non-warranty repair is economical.

But since a FLAME(!) came out of it, I would think you have a VERY strong case to "convince" Sharp to give you a replacement pronto...

You can contact Sharp at 1-800-BE-SHARP (1-800-237-4277).

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

Feb 17, 2008 | Sharp R-306LK Microwave Oven

1 Answer

FIRE


Manufacturers will note that they warn in their owner manuals to never leave a microwave running unattended, so they won't help you any further, I'm sure.

Mmost modern microwaves have a flame sensor inside that will shut the microwave down completely in case flames get too high.

Then the cooling fan and power will shut off, and the fire will almost certainly be smothered pretty quickly due to a lack of air inside the oven.

Also, the inside is metal, thus the only fuel for the fire would have been the potato, which would not have lasted long.

So as scary and disturbing as this event was, I would say the real danger of a fire outside of the oven was miniscule.

The fire probably occured due to a dry or irregular spot in the skin of the potato. Once it's dry, it will of course burn much easier.

So now to the smell...

You should do a Google search on "odor microwave" or "microwave smell" where you can find tips on boiling water & baking soda, then vinegar and water in the microwave to neutralize the smell.

If your microwave does not work, then it may have blown the flame sensor (thermal fuse) and that would have to be replaced.

Please let us know if we can help further.

Nov 15, 2007 | Kenmore 62702 Microwave Oven

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