Question about Magic Chef Microwave Ovens

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Why does my range hood microwave oven shut off after 2.00 min and takes 20.00min to turn back on?And why is this our second one that has done the same thing?

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I would suspect that the magnetron is overheating and that the magnetron's thermostat is cutting power until it cools down.

It may be overheating because the internal cooling fan is not running when you're cooking.

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 soon be destroyed.

It may also be that your filter is clogged, or your exhaust ductwork is clogged.

FixYa's Web site is currently not notifying us when replies to our Clarification Requests are posted, so please reply directly to me with your full number from the tag on the unit so I can help you with free do-it-yourself tips or an estimate.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Posted on Oct 06, 2009

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Brand new microwave never used turns on for 2 seconds then shuts off. Model hmt5750. Callers customer support, they have no idea. Before I call a repairman does anyone have an idea I may try.


Take it back to the place of purchase and demand a replacement, you are covered under warranty. The problem could be caused by a faulty magnetron.

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The over the range microwave hood has a heat sensor in it. If it senses hot temperatures from cooking below it will turn the fan on. The fan will turn off once it cools down, this is to protect the microwave controls from damage.

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It doesn't have to vent outside. These are designed to recirculate the filtered air back into the room. If you cook without a range hood now it will work fine for you.
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Does your microwave have a "popcorn" setting and are you using it? Is there a rotating table in your machine? Is your popcorn bag elevated on top of a bowl or similar? Are you using some other "sensor" setting? Can you use straight time setting and get it to go past the 1 min 45 second mark?

On my microwave, it takes just about that much time and the popcorn is done ... BUT only if I elevate the bag to about the middle of the oven.

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If the oven is completely dead it might be due to a fuse. Most ovens use a 15-amp ceramic fuse found under the cover. Two problems, though. First, the fuse seldom just goes on its own; usually something else is bad first, which means other troubleshooting and parts replacement. Second, many microwave oven covers are held on with security screws and you'll need to hunt up the appropriate driver.

If the oven has power but doesn't heat, the cause is usually failure of one of three main parts that make the microwaves (magnetron, capacitor or diode).

A microwave oven is not complicated to work on, but because of the voltages present and possibility of microwave leakage if a repair isn't done correctly, there is an element of risk involved. Unless the oven is a very high-end model or a built-in or over-the-range model, you might want to replace it instead of repairing. Like other appliances, they are inexpensive and repair often comes close to or even exceeds the cost of new.

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It could have been steam or humidity.

If this is an over the range model, be sure you always use the hood vent exhaust fan when you're cooking on the stove top.

Whether it's a counter top or over the range top, always be aware that the cooling fan is running when it's cooking.

When in doubt feel for air flow through the vents.

Good luck.

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1 Answer

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My microwave is under warranty. I have this problem before and it was "fixed" one month ago by replacing a thermostat. This repaire is under warranty for 90 days.
I will have a service man to look into this problem.
Thanks MK

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