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Hello, I have Model No. NN 8950 BA Panasonic Microwave Inverter. The problem is when I insert the time, it will start working for few second and will shut off immediately, will not hold the full time. can you suggest the problem as well as a repair centre close to me. I am in NY 10573

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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.

If it stops after 16 seconds,it may have a defective humidity sensor.

If it stops after 22 seconds, it probably has a bad magnetron or inverter.

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

I would recommend that you contact your nearest Panasonic-authorized servicer.

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

Posted on Jul 18, 2008

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My panasonic microwave NN-S954WF will run a few seconds and then stop. What should I check?


If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter, controller, magnetron, or a bad connection from one or the other.

If it stops at 16 seconds and is a sensor model, it probably has a defective humidity sensor.

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

If it stops at 2-3 seconds, see if this describes what's happening:
  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
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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.


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You can find an authorized Panasonic servicer here.

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

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

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You can find an authorized Panasonic servicer here.

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

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