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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6 Suggested Answers

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Posted on Jan 02, 2017

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MicrowaveSvc
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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

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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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1 Answer

Panasonic Microwave will not work pass 20 seconds


Your Unit has an inverter, when the unit stops running after 10-20 seconds it is having a problem with either the Magnetron or the inverter. Sometimes both. There is not an easy way to test the inverter, the mag can be tested for shortage to ground with an ohm meter and between the terminals to check the filament for continuity. But if both are bad it is cheaper to buy a new unit.

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The following link will take you to a page with the diagnostic flow chart that you can use to troubleshoot this issue:
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This customers review of that issue may also be of some help:
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my microwave shuts off after a few seconds. is there a fuse that needs replacing?

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1 Answer

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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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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Micro Wave shuts down


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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