Question about Magic Chef Microwave Ovens

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I have a Magic Chef MCO153UB. When the unit is used to cook for 5-10 minutes you hear a distink change in the way it runs, the light stays on and the table still turns and the fan runs, but cooking stops for awhile until the machine cools down(?). Have you ever heard of this problem?

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Thanks for the great details about the light & turntable.

With that in mind, this is either a failing upper door switch, a failing relay or connection on the control board, or a failing magnetron.

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.

Another helpful link:
http://www.microwavedisplay.com/doorsw.txt

There should also be a helpful wiring diagram hidden inside the unit behind the control panel.

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

Feel free to contact me directly (and please remind me of your full model number) 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
prototech@usa.net
http://www.microwavedisplay.com

Posted on Dec 02, 2008

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I have a magic chef microwave that heats well but when the door is closed it hums and get really hot on top while not in use. Eventually it will stop working all together until it cools down then I can...


This one actually sounds like the unit is cooking when the door is closed without blowing the fuse as it is supposed to do. Unplug it from the wall and let it cool down, which it probably already is. Put a cup of cold water in it, close the door and plug it in for one minute. Unplug it from the wall and check the water. Did it heat up? I'd bet that it heated the water up. Sometimes the cook relay sticks closed and it stays in cook mode. This condition is supposed to blow the fuse but really rarely it doesn't. I've only seen this happen 3 or 4 times out of about 14,000 units I have looked at in my career.
It would need a new control PCB and new door switches and probably a new magnetron.

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For more help from Magic Chef / Ewave see here or their contact page.

For Magic Chef in Canada call 866.587.2002

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

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Check the packets you are using, you will have to reduce your power output.

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I have seen countless posts on here after cooking popcorn!

More fun on the hob anyway - and cheaper to buy in bulk!

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If you don't have your owner's manual, you can download it here:
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We're happy to help and we appreciate your thoughtful rating of our answer.

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