Question about Panasonic NN-T990SA Microwave Oven

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Panasonic inverter microwave NNT583SF

The problem with my microwave is that it turns off at 37 seconds every time. WHY?

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  • IAmMisterWan Oct 16, 2008

    I have the same problem.

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Posted on Nov 10, 2008

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The settings on my microwave appear fine. Then I set the time for let's say 50 seconds and it turns off in 5 - 9 seconds. Then what you see is the correct time --- no other message.


If this is an inverter oven, it could mean that there is a problem on the inverter board. Testing these boards is fairly simple. You just need to find a service manual for that model.

Jul 18, 2016 | Panasonic Genius Prestige Inverter...

1 Answer

Mi panasonic prestige inverter microwave will not


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 http://031d26d.namesecurehost.com/mwd/safety.txt http://031d26d.namesecurehost.com/mwd/disassembly.txt http://031d26d.namesecurehost.com/mwd/doorsw.txt

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.

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.

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

Jul 18, 2010 | Panasonic NN-P295SF Microwave Oven

1 Answer

Microwave runs for 3 seconds and stops


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 http://207.234.249.73/mwd/safety.txt , http://207.234.249.73/mwd/disassembly.txt and http://207.234.249.73/mwd/doorsw.txt

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.

May 31, 2010 | Panasonic Microwave Ovens

1 Answer

Microwave shutts off after 2 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
If so, see
http://207.234.249.73/mwd/safety.txt
http://207.234.249.73/mwd/disassembly.txt
http://207.234.249.73/mwd/doorsw.txt


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.

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 yours is not a Panasonic, please reply back with your brand and model number so we can help you.

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

May 22, 2010 | Panasonic NN-S592 Microwave Oven

1 Answer

Microwave cut off


the main control board is "seeingf" a high amprage draw from the inverter board . you have a problem with the inverter or the magntron . parts are more than a new unit . try to stay away from the inverter type , there just not ready for prime time . google "panasonic inverter reviews " and you will see just common your problem is good luck

Jan 16, 2009 | Panasonic NN-S753 Microwave Oven

2 Answers

Stopped heating, shuts off before time expires


My panasonic microwave model # NN-S540BFW stops after 4 seconds after you hit the start button and cuts off on its own. What is wrong with my microwave?

Jan 12, 2009 | Panasonic NN-S763BF Microwave Oven

1 Answer

Panasonic Microwave only works for 37 secs no matter what time setting


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 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.

Jan 04, 2009 | Microwave Ovens

1 Answer

Panasonic microwave shuts off


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.

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.

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

Dec 25, 2008 | Microwave Ovens

1 Answer

My microwave is a 32ltr 1200w NNT583SF Inverter. it is 4 yrs old. No matter how long i set the timer for it will only work for 23 seconds, then it just switches off??


The 22 seconds is the giveaway.

In most cases, this is 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.

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

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

Aug 05, 2008 | Panasonic Microwave Ovens

1 Answer

Another Microwave that shuts down after 3 seconds of microwave operation


This model uses an inverter to produce high voltage. That symptom is an usually indication of a problem with the inverter. Due to the lethal voltages involved, I do not recommend that a person without training and experience ever work on these models. And of course at less than 1 year, this would still be under warranty if you have your sales receipt. You should be able to locate a Panasonic-authorized servicer here: http://www.pasc.panasonic.com/WhereTo/FindServicer.asp?Pass=1 I would mention the exact symptom when you call so the technician can bring a new inverter with him when he comes out to repair it. Might save you having it pulled into the shop. Good luck!

Jan 24, 2007 | Panasonic NN-P294SF Microwave Oven

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