Question about Panasonic NN-T990SA Microwave Oven

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Panasonic microwave, returns to clock setting after 3 seconds

I'm not sure of the model, but its panasonic brand, it shuts off after runnign just 3 seconds. I unplugged and plugged it back in thinking it was some sort of protection setting but it still does the same thing. Started yesterday, not sure of how old the oven is exactly - less than 2 years I think. If I were home I'd call the company! Any suggestions?

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This sounds like one of two things to me it maybe if the unit has inverter on the front of it the magnetron or the inverter itself both repairs can be expensive if its both and that does happen around 80.00for the magnetron and poss not much change out of 120.00-150.00 for the inverter sorry its best with that fault to take it to a shop or call an engineer unless you are confident with this sort of unit its best left to a pro

Posted on Oct 23, 2009

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Mar 18, 2012 | Panasonic Microwave Ovens

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Microwave cuts off after 30 seconds


We would need to know the brand and full model number to be sure, but since you posted in the Panasonic section, I'll assume it's a Panasonic.

Panasonics have preset times in which it will shut off if certain failures occur.

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

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.

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.

Dec 12, 2011 | Panasonic Microwave Ovens

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Panasonic microwave oven cuts on for two seconds 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 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.

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.

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.

Nov 03, 2011 | Panasonic NN-T994SF Microwave Oven

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Oven only runs for 5 seconds no matter the time programmed in. the power level can be set and it does not matter, the oven runs for 5 seconds and shuts off.


I would need your full model number to help you best, but I'm guessing that at least it's a Panasonic?

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.

If yours is not a Panasonic, please create a new post 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.

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Hello Two options to try: a) Press the Clock / Timer button 3 times b) Unplug, wait a few seconds, then re-plug to power up with the factory settings. You will need to reset your clock and any favourite settings.
This should work with all Panasonic Microwave models.
Good luck

Aug 10, 2010 | Panasonic NN-H275 Microwave Oven

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Microwave only runs for about 3 seconds.After


Chances are you have a failing magnetron.

But to allow us to help you effectively (at no charge), please post a
NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, your symptoms, "Microwave only runs for about 3 seconds then stops and the timer goes back to the clock mode.After several attempts then it will work.Problem is intermitten"

Dec 04, 2009 | Panasonic NN-S252WF Microwave Oven

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It keeps shuting off and the screen reads "refer to operation manual" it shut off after a second


The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for maybe an hour.

Since FixYa is not currently notifying us Experts when Clarification Requests are answered, you will need to post a NEW help request.

I
n your new post, please include your brand name and the full model number from the tag in or on the unit, your symptoms, as well as the answers to these questions:

- How long does it run (in seconds) before this happens?

- Is it consistent or random?

- Is there an error code on the display when it fails?

Oct 07, 2009 | Panasonic Microwave Ovens

1 Answer

Turns itself off after only running 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
If so, see http://www.microwavedisplay.com/safety.txt , http://www.microwavedisplay.com/disassembly.txt and http://www.microwavedisplay.com/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.

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