Question about Amana Microwave Ovens

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Our microwave completly shuts down when on for more than 4 minutes. I was baking potatos and it seems to do this when it overheats

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If it is going dead as if someone unplugged it, it sounds like the magnetron is overheating and opening the thermostat.

This can be caused when the internal cooling fan is not running or by a magnetron that is failing.

When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

It is vital that the cooling fan runs, or the magnetron will be destroyed.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

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.

It's a pretty common failure.

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

Posted on Dec 02, 2008

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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.
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Not much info to go on here. Are you putting in the number of potatoes vs.the cook time? Most microwave potato functions would not read "5 minutes." It would be read as a request to cook 500 hundred potatoes.

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I was cooking 4 potatoes for 14 minutes then put in frozen corn, started the microwave oven again and everything shut down.is there an internal fuse or breaker? or is it time for a new one.


Many of these ovens have either a humidity sensor or oven cavity sensor that will shut the oven down if the internal oven cavity humidity or temperature exceed a certain level. Baked potatoes are often a culprit as they retain a good amount of heat and generate humidity when they cook. In most cases, allowing the oven to cool down with the door open for about half an hour will restore operation.

However, there is also a thermal cut-out (TCO) on some models that will trip if the internal temperature of the oven cavity gets too hot. If the TCO trips, it must be replaced.

Since you posted no Brand Name of Model Number, I do not know how your oven is configured. If you post back with this information, I can verify and may be able to diagnose a cause of your problem.

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Is not normal for a microwave to shutdown after 4 minutes of operation.
From the info you are providing, It looks like the magnetron might be overheating causing the thermal fuse to shut it down until it cools down. There may also be a loose connection in one of the switches or a cold solder joint in the low voltage power supply.
I would suggest to check and make sure that the fans are functional, If always did; it could be that there isn't much air circulation where the appliance was installed.

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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.

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Very poor design.
I was told to put a microwave safe plate down and put the popcorn bag on it. This should help to reduce the heat and not trip the sensor.
A safety sensor is great, but not if it keeps tripping the machine and shutting down!

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