Question about Panasonic NN-T990SA Microwave Oven

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Panasonic Inverter Microwave 1250 watt Oven model NN-S935BF

I set the time it runs for a couple of seconds and shuts off. A strange "burnt plastic" odor can be detected. especially from the rear vent.

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  • NASCARLANCE Apr 05, 2009

    Same here runs for 4 seconds and quits. From what I have found it is most likely the inverter and it seems to be a common problem with these Panasonic microwaves.

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5 Suggested Answers

MicrowaveSvc
  • 8820 Answers

SOURCE: scrape or fix? Panasonic inverter genius sensor 1250 watt

In most cases, this is a problem with the inverter but it may be a bad magnetron.

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. You can find one here:

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

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

Posted on Dec 07, 2007

  • 579 Answers

SOURCE: PANASONIC NN-S933BF 1300 WATT INVERTER

yes, get that fixed. it is a danger.

Posted on Jan 01, 2008

EwingElect
  • 276 Answers

SOURCE: Shuts off after 23 seconds....

In most cases when the microwave stops @ 23 seconds it's the Magnetron which has failed, and is shorting to earth.

Either that or the magnetron isn't getting the right signal from the inverter board. It gives it 20 seconds to get the right signal or it shuts itself off.

Posted on Apr 04, 2009

  • 4090 Answers

SOURCE: Panasonic Microwave NN-S935BF turntable and light

Your description seems to be confusing turntable and light do not work
Bulb and motor OK
No power to light or turntable

Which is it?

They could be separate incidents. The drive motor could be fused and the globe just blew its life away..

Posted on Aug 16, 2009

  • 1 Answer

SOURCE: Panasonic NN-T994SF Microwave Oven quits after 15 seconds

my microwave shuts off after a few seconds. is there a fuse that needs replacing?

Posted on Nov 24, 2010

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Shuts off after 23 seconds....


In most cases when the microwave stops @ 23 seconds it's the Magnetron which has failed, and is shorting to earth.

Either that or the magnetron isn't getting the right signal from the inverter board. It gives it 20 seconds to get the right signal or it shuts itself off.

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

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

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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It could be shutting off because of the heat sensor on the magnatron is over heating because of a bad capacitor or diode or the power transformer its self. This is a call for the service man BUT you know these days a microwave like this cost a couple of hundred bucks maybe a little more too. But it will possibly cost 150 or so if not more to fix the average microwave. If you really like it, then see if you can have it estimated BUT its not for the handy man to try to trouble shoot as theres extremly high voltage in these puppys even when they are not plugged in!! Good luck

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