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Question about Panasonic NN-T993SF Microwave Oven

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Microwave shutsdown after 24 seconds, does not heat up

The microwave starts up and the turntables turns for just over twenty seconds, but then just stops. The food does not feel any warmer. The power remains on. There are no unusual sounds or smells. I thought perhaps the exhaust vents were covered and the microwave was shutting itself down to prevent overheating, but I cleared any possible obstructions and the problem still persists. The unit is just over two years old.

Posted by Richard Rohde on

  • 1 more comment 
  • Anonymous Jan 15, 2009

    When I open the door to put food into the microwave it starts. When food was in the microwave and it binged and the timer was done, I opened the microwave door and the light when on and it started up again with the door open. Whats up?

  • moonshaddow Feb 14, 2009

    I have the same model, manufactured Jan 2004, with the exact same problem, except the time is 36 seconds exactly, every time. Everything appears to work until it stops, then the display goes back to the time of day rather than the cooking time it should be showing. In normal operation, when the food is done, the display scrolls "ENJOY YOUR MEAL". Since it stopped heating the food, after the seconds it runs, it simply shuts off and displays the time of day. One authorized Panasonic repair facility told me there was a recall on this model between March 2004 and [sometime in] 2005. But he said my unit would not be covered :-( Thank you for the part number!!!

  • Anonymous Mar 26, 2014

    Brand new but sounds like its too hard to turn table each time (power 6) the magnetron shuts off for a time. Loud like something not right and could break down further. What is the connection between turntable and magnetron being on? That is where the problem sounds to be. Need to return immediately most likely.


1 Answer

William Miller

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Classic symptom of a defective inverter. It it's under warranty, you're probably in luck. If not, expect repair costs of about $120-150. If you can find a servider who will repair the inverter instead of just replacing it, you can save some money. If you or a friend can replace it yourself, you'll really save, assuming you follow safe procedures. You can find my file "safety.txt" via a Yahoo search. It is part # A606Y5X00AP for model NN-T993S and runs $62.83 plus shipping. The inverter can be gotten from Panasonic at

Posted on Nov 01, 2006

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