Question about Magic Microwave Ovens

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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
  • 9,098 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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Posted on Jan 02, 2017

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Hey my gas went out so I had to resort to cooking in the micro wave after I cooked the rice the microwave shut off completely I had it on for 20:00 mins whats goin on


It has probably overheated. It may come back when it cools down, or you may need to have the thermal fuse replaced.

Worse case scenario is that you have burned it out.

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Shuts off without cause


The fuse may have been busted. Try opening the microwave and replace the fuse which you can do it yourself - trust me. The old fuse would probably have darker/burned portion.

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Why does my over the range microwave keeps shuttingoff our electricity in the kitchen


This may have a short in the high voltage side, rectifier or shorted high voltage capacitor. You may find it cheaper to replace the microwave, however you do need to call a repairman.

Aug 13, 2012 | Kenmore 1.7 cu. ft. Over the Range...

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During cooking, the microwave will work for about 3 minutes then completely shut down.There appears to be a complete power failure.After the units sits for about 5 minutes,it resets itself and you can cook...


sounds like the cooling fan has came adrift or stopped working , this will cause the magnatron ( the microwave generator ) to overheat tripping the over temperature stat ,so fix the cooling , but be sooooooooooooo carefull in there , microwaves + really high voltages , not really a job for a non electrician/microwave tech

Oct 20, 2009 | Samsung SMH7178STD Microwave Oven

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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.

Oct 11, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

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Will not cook or will not warm


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

Jul 24, 2009 | Panasonic NN-H504WF Microwave Oven

1 Answer

Magic chef over the oven microwave shuts off.


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.

Mar 03, 2008 | Microwave Ovens

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Magic chef microwave shuts down


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!

Sep 02, 2007 | Microwave Ovens

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