Question about Panasonic NN-T990SA Microwave Oven

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Runs for 30 sec shuts off does not heat

My microwave runs for approx. 30 sec before stopping and telling me to enjoy my meal that mind you was not heated no matter how many times i start it.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Shutting Off Prematurely

may be highvoltage circuit or high voltage diodes, or mains power problem, check the control unit.may be magnetron..

Posted on Sep 25, 2007

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  • 178 Answers

SOURCE: Micrwave does not heat, and turns off by itself before time

Unplug the Microwave and remove the outer cabinet. Inside the cabinet will be a thermal insulated fuse, looks like the old buss fuses for early model cars but white. Replace that with the correct fuse which can be found at Lowes or Home depot and see if that solves the problem. Be careful not to touch any capacitors if they are in there.

Posted on Mar 14, 2008

bestdarngood
  • 3037 Answers

SOURCE: Panasonic NN-S563 no heat

the magnetron has gone bad, not worth it to repair, go out and buy a new microwave. A $40-50 dollar one will last quite a while.

Let me know if you have any questions, just don't buy GE.

Posted on Oct 20, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave shuts off before time elapes

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

The best place to order Panasonic parts is Tritronics. You can also call them at 866-779-5835.

If you prefer, 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.

Posted on Dec 07, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: oven won't heat and shuts down after approx. 20 seconds

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.


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

Posted on Dec 18, 2008

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Micro wave stops working after 30 secs


Replace the door interlockswitches - or try re-positioning the existing set. They wear after time

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I have the same model and my problem is that after I cook something and clsoe the door, the microwave stays on, carosel not turning fan is blowing and light is on. Repairman told me that I am not closing the door correctly and that is the problem. He tshowed me how the door is not solid and you can close the bototm part of the door (latching it) but not the top and that is why it is staying on. I say it is a manufacturer's design defect. He charged me the $99.95 service charge. What a rip off.

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When pushed, the 30 sec button says 3 minutes. none of the display buttons work.


Have you inadvertently programmed your microwave for "autostart"?
Your model microwave has the ability to be programmed to go on at any given time of the day/night, even when you're not home so that you can have a defrosted and cooked meal waiting for you when you get in.
I know that if you hit the 30 sec button or the minute button when your micro is programmed to autostart it will tell you the time that it's programmed to autostart or the amount of time that's left for it continue cooking.

Have you tried unplugging it for a few minutes?
This should clear it's memory and then all you'll have to do is set the time on the regular clock if you want.

Here's where you can download and read your owners manual for further instructions on how to use the autostart feature and everything else:

http://www.fixya.com/support/p113437-emerson_mw8107wa_1000_watts_microwave/manual-11318

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Microwave does not heat.


HI, this is an inverter board issue. the magnetron would not shut down the unit. if the magnetron was the issue, it would continue to run but, it would not heat.

replace the inverter asap.

Jun 17, 2009 | Panasonic Microwave Ovens

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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.

Apr 04, 2009 | Panasonic Microwave Ovens

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

SHarp R-9H84B Microwave with Convection


I suspect a door switch firstly followed by the diode pack, magnetron and capacitor. One or a number of these things has taken the internal fuse situated on the mains input panel near where the power cable enters.
BE VERY CAREFUL lethal voltages exist inside and not just mains voltage, many times greater!

Mar 13, 2017 | Microwave Ovens

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PANASONIC MICROWAVE MODEL NN524M


I have had many of these ovens and found it to be the Magnetron never try to fix a microwave yourself.

Jul 15, 2008 | Panasonic Microwave Ovens

1 Answer

Neff Microwave H5470SOGB


if appliance runs for approx twenty seconds this is nearly always a magnetron fault usually a cracked magnet or burnt out anode the electronics are detecting an unusual power fluctuation and shutting appliance down for safety you will need service tech to sort.

Jan 05, 2008 | Neff H5470 Microwave Oven

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