Question about Maytag MMV4205 Microwave Oven

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No power at display!

Thought I was using the kitchen time and set it for 30 minutes. came back later and seemed like heat coming from unit. could not stop timer. Eventually shut off by itself. Now have no power to the display. Circuit breaker did not trip.Maytag MMV4250AAS

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  • 9,179 Answers

You've probably destroyed your magnetron, and the magnetron thermostat.

This kind of abuse will not be covered under warranty.

It will likely run about $75 for a technician to visit the home, $75 to do the work, $75-90 for the magnetron, and about $15 for the thermostat.

You can locate a Maytag-authorized servicer at http://www.maytag.com

Posted on Apr 26, 2010

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Is unit totally dead, check overload that is near lamp at top of cabinet, the terminal at the overload was melted.

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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See if this describes what's happening:
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If so, see http://207.234.249.73/mwd/safety.txt http://207.234.249.73/mwd/disassembly.txt http://207.234.249.73/mwd/doorsw.txt

Otherwise, if the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle.

It may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed.


Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on these.

You can find an authorized Panasonic servicer here.

In Canada, you can find an authorized Panasonic servicer here.

If yours is not a Panasonic, please reply back with your brand and model number so we can help you.

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

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The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

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Let us know what you find out.

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

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

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This addressed in your owner's manual. but if for some reason you don't have your owner's manual, you can download Maytag owner's manuals and installation instructions here.

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