Question about Panasonic NN-S431WL 1000 Watts Microwave Oven

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Panasonic NN-S567BAS Receiving power, No Waves

Everything comes on. It just won't cook nor will the table turn. looked at doorr switches. top door switch seems a little heated(burned) looking on one connector. it reads com on the schamatic.

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I would still suspect the top door switch. You would need to operate the switch to see if it clicks both ways and ultimately a test with a meter is required. If you don't have a meter, you can connect wires to a battery and a flashlight bulb, etc., and use that as a continuity tester. On the door switch, COM is common, NO is normally open, and NC (if present) is normally closed. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find thew whole service manual (in sections) and order parts by entering your model number (without the dash) here: http://www3.sears.com If it's not the door switch, I would suspect the control circuit board (the one behind tghe keypad) and we repair these nationwide for only $39.95.

Posted on Jun 04, 2007

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Posted on Jan 02, 2017

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This is either the door sensing switch (most likely) or a bad membrane switch [start switch] (that's what Panasonic calls it) on the touch pad. The contacts on the door sensing switch can be slightly contaminated and not read "zero ohms" to the control PCB. The control board thinks that the door is open and it will not allow the cook cycle to start.

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Chances are that is just a defective top or bottom door switch or its mount.
See our help file on door switches here.
Also, that model number does not show up as a valid US Kenmore model.
Please check the tag in the cooking cavity or elsewhere n the oven and let us know if you need further help.

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My microwave won't heat


The real clue here is strangely enough the table not turning.

All units have a switch in the side (usually the right side) of the cabinet--when door is opened it allows the unit to work but will not heat or the table (usually both) will not work.

It has to be got at from the inside of the unit--little plastic holder with the switch which looks like a leaf switch.

What I have seen several times (including a unit I own) is that from countless opening and closing the door the holder may break or even melt and the contacts on the switch no longer are in position to work when door is open.

The purpose of such a switch is simple---it prevents the unit from being used if the door is OPEN.

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You may have a shorted door switch or a shorted relay on the control board.

You can see a help file on door switches here.

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

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No! this is not normal, the light should only come on when it is cooking, the cause may be a defective door switch, the oven would need to be dis-assembled to test all the switches to find the faulty one.

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Hello :

This happens because of a bad door switch . The plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door .

best regards .

please don't forget to rate !

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1 Answer

Everything works on my microwave oven but it doesn't heat the food


Check the door safety interlock switches ...

Remove the cover and find the switches opposite the hinges. Check with a contunity meter.

If you open the door while the oven is cooking these switches arc. Enough arcing and they burn. When they are burned, they cannot tell the oven that the door is closed. When the oven thinks the door is open, it will not turn on the heat.

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