Question about Panasonic NN-S954WF Microwave Oven

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Shuts off after approx 5 - 7 sec. some smoke

Shuts off after approx 5 - 7 sec. some smoke coming from vents underneath turntable area. one white conn on door switch has brown scortch mark.

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  • 9,047 Answers

If it stops after 7 seconds, it has a problem with the inverter.

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 you prefer to replace the inverter yourself, you can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on May 16, 2010

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Have the same issue with a panasonic s954wfr after 8 years of use. Last year the door switch microswitch burnt out due to totally inadequate 24 gauge wiring. Early on symptom was that the turntable tray would start rotating back and forth whenever the door was opened. Finally stopped all together. Pulled the lid and the melted wiring leads on the cracked open switch was a definite clue. Replaced it with a generic and it worked great ... for 6 months. Then it started shutting down after around 10 seconds of cooking blowing smoke from the bottom vents. Didn't see the turntable rotating so I assumed the motor had burnt out. Disconnected turntable motoro and the cook cycle ran on for the full cook time. But when I put the new turntable motor in it ran for about 30 seconds and then started spewing smoke and shutting off again. I'm looking for a circuit diagram for this thing. The panasonic web site is un-navigable. Suggestions?

Posted on Jul 07, 2013

  • Stewart Champion Sep 11, 2014

    Bad news. Looks like the motor burnout fried part of the powersupply that's integral with the invert assembly. Too expensive and I don't like debugging running microwaves without shielding. Retired it for parts.

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http://www2.panasonic.com/webapp/wcs/stores/servlet/vServiceLocator?storeId=15001

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