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The microwave keeps shutting off

I have a microwave oven Model # mco 160ub after cooking on high for about 4 min. it shuts off completly, just like i pulled the plug. after about 2 min. it comes back on. can you help me out. its only a year old

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  • Magic Master
  • 9,047 Answers

I would suspect the internal cooling fan is not running, or the vents are blocked.

This would cause the magnetron to overheat, then the magnetron's thermostat on the magnetron opens, interrupting all power until it cools down.

This is to protect the magnetron from being destroyed.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) 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, AS-EET
prototech@usa.net
http://www.microwavedisplay.com
Microwave Oven Control Panel Repair Nationwide

Posted on May 05, 2010

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Ge pvm2070smss shuts down


It may be a noisy magnetron if the failure occurs in a second or two of hitting "Start" to begin cooking.

See this FixYa solution. even though your model number is different.

Otherwise, if the internal cooling fan is not running when you are cooking, it will shut down after 30-60 seconds or so and stay off until it cools back down.

Also see http://www.microwavedisplay.com/jvm2070.htm

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My microwave oven shuts down when set at high a high cooking number. I must wait a while before it can used again. I have a GE spacemaker


It may be that your magnetron is overheating, which will trip the magnetron's thermostat, which will interrupt power until it cools down a few minutes later.

Or it may be a defective magnetron causing electrical interference that disrupts the control circuit.

In order to help you, we need your full model number and some further information.

So please post a NEW question, and please include your brand name and the full model number from the tag in or on the unit, as well as the answers to these questions:

- How long does it cook before it shuts down?

- When it shuts down, does it go completely dead, or does it just stop with the display still lit?

- When you try to cook, do the inside light, turntable, and internal cooling fan all come on?

- Is it making any unusual noise?

- Is it louder or quieter than usual?


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

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Your temperature sensor inside on the microwave need to rreplace. It maybe dirty or faulty. Bring your microwave to electronics technician to check it.

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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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We had the same problem with our brand new Magic Chef. Before going through the trouble of taking it back I called Home Depot. After talking to a Home Depot Rep I am told that the overheat sensor is under the glass plate directly beneath the popcorn bag. Popcorn gets very hot and the heat of the popcorn causes the sensor to shut the machine down. I would imagine this would be the same for a baked potato.
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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