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Sparking fire inside the microwave - Knemore Model No. 721.80522500

I wrapped a potato in an alminum foil inside micorawave, a sparking fire burned the left rear plastic hock which holds the metal shelf. I cleaned inside the microwave but the sparking continue. After we removed the burned hock the sparking stopped. What should I do ????

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Re: sparking fire inside the microwave - Knemore Model...

If the sparking has stopped, that should be fine.

If you have a burned spot you may need to sand it and repaint it with appliance paint from Wal-Mart, etc.

You can probably replace the shelf bracket / hook if it's still available.

If you'll post your brand and model, we'll see if we can steer you toward a source for a new shelf bracket.

If it's a Kenmore, you can probably find an exploded view by entering your FULL model number here: (the 3 is correct)

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

Posted on Dec 07, 2007

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No! But it will need to be repaired. Did you wrap the potatoes in tin foil? The reason for the smoke needs to be found and repaired. Smoking means a short or a part shorted, failed, or wires touching another wire that did not blow any fuss.That is not good.
Trained technicians can help the mfg improve their products if they find the problem and report it to the Mfg.

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I put a metal pan with food inside my microwave oven. I heard a popping sound and there are now two tiny black marks pitted into the glass on the door. I can feel the two pitted marks from both inside...

Yes it is safe to continue using the Microwave as long as the integrity of the glass is not compromised and the pitted marks do not exceed 1/4 inch. The RFwave generated by the magnetron is a pretty wide RF wave beam.

If your really concerned you can take the unit to any appliance service center and ask that they perform an RF leakage test. There is really no other way to know if your leakage is within acceptable limits. I can tell you from personal experience that the ony microwave I ever saw demonstrated excessive leakage had either been dropped and had hinge or latch damage.

If your really worried about it and can not get to a service center you can do this test:
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- Run the microwave with a GLASS filled with water of equal size for 1 minute.
- Stand back 3 to 4 feet and watch for any signs of a spark on the aluminum foil.
- As soon as the microwave shuts off check the dry foil wrapped glass for any signs of heat.

(No heat.... no problem. Sparks or Heat = repair time.)

Thanks for choosing FixYa.


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Baked potatoes went up in flames now microwave has no power no lights. power outlet has 110v ac

Were the potatoes wrapped in foil? If so, the megatron tube was burned out. Replace unit.

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Will tin foil in the microwave ruin it completely? The microwave turned off after my son mircowaved a potato wrapped in tin foil.

You should always put a spoon in a cup of liquid that you heat in a microwave oven.
The microwave with a potato wrapped in tin foil is like operating the oven with nothing in it! If the microwave was spotlessly clean then your in trouble.
1 put a cup of cold water in the microwave and set for 5 minutes. if the water boils then your lucky if it cold then go and buy a new microwave and stop your childs allowance for a fortnight.
One might ask the question how old is your child and should they be using such a machine unsupervised!

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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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