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Posted on Jun 07, 2008
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Microwave re-started I have a 1991 Panasonic NN-5560A microwave oven that re-started on it's own. I was heating a frozen dinner on medium power for 8 minutes. I left the room while it cooked and heard the five beeps indicating it stopped cooking. After a couple minutes I entered the kitchen to find it had re-started and the clock said 6 minutes left to cook, still on 50% power. My dinner was overcooked with the extra couple minutes, so I know it had completed the previous cycle. Have you heard of this happening and is it time to get a new microwave? We've never had problems with it. How would it re-set itself that way and turn on again?

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William Miller

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  • Microwave Ovens Master 9,179 Answers
  • Posted on Jun 08, 2008
William Miller
Microwave Ovens Master
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The Start pad on the keypad may be starting to short. If so, a new keypad (membrane switch) would fix it.

If you might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved. It's at
http://www.microwavedisplay.com/keypad_replacement.pdf

We have critical safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

The part # needed is A64795790AP "membrane switch" for $46.88 available here.

We're happy to help and we appreciate your thoughtful rating of our answer.

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Chances are your Start key on your keypad has failed.

If you might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved. It's at
http://www.microwavedisplay.com/keypad_replacement.pdf

We have critical safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

It is part # A64795790AP "MEMBRANE SWITCH", it runs $46.88 and you can find it here:

If you would like to have us do this for you, we do that for $39.95 plus part costs.

We're happy to help and we appreciate your thoughtful rating of our answer.
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Try using a standard nonmetallic cup (beaker) and fill it with water. Heat for 2 minutes. The water should be boiling hot. If not, your oven is not doing it right.
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