Question about Panasonic NN-S254BF Microwave Oven

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Panasonic NN S254BF

Microwave runs for 5 seconds then shuts down. can you tell me what the problem is

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  • Anonymous Jan 18, 2008

    when the microwave starts, there's also a noise, like sparking. I'm gonna open it up and see what I can find

  • Anonymous Mar 07, 2008

    Loud buzzing noise, shut down in 5 seconds or so. Haven't tried it again. ;)

  • Anonymous Mar 18, 2014

    Runs for 3 shuts down



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It sounds like one of the wires or serkits are loos so the electrisity is not getting to it all the way I would return it or take it apart and try to fix it your self.

Posted on Dec 30, 2007


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Jun 06, 2010 | Panasonic NN-S254BF Microwave Oven

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Panasonic NN-S254BF microwave oven runs for 2-3 seconds and then shuts off'

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
If so, see , and

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.

That 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.

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

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No sorry the issue will be with eiher the inverter, the magnetron or the main timer board. There is a tracer signal that comunicates through these components and if it doesnt get to where it is supposed to go it wil just shut off, the big hint at that is the time interval. It is not something like a sensor heating up and causing a fault. it is not running long enough to get any thing hot it is in the electroincs. Too expoensive to repair, im sorry better to get a new one. Good Luck

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This is a problem in one of the damper-related components, most likely the switch, but it may also be the motor or the damper door.

The damper is a door inside that opens or closes depending on cooking mode. If the controller senses that the door is not in the right position, it will shut down the cook cycle.

Sharp models stop after 59 seconds.

See the attached sample photo.

We have the service manual and have uploaded it to our site:

You can order Sharp parts from Tritronics at


Jun 07, 2008 | Panasonic NN-S254BF Microwave Oven

1 Answer

Panasonic Microwave

Since it's under warranty, I would contact Panasonic customer service for a free repair.

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

Apr 02, 2008 | Panasonic NN-S254BF Microwave Oven

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