Question about Panasonic NN-T994SF Microwave Oven

3 Answers

Turns of after 3seconds

When the microwave is turned of it turns off after 3 seconds and has a
burning smell.

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  • ljb00 Jan 30, 2009

    Same problem - turns off after 3 seconds with a burning smell. Ours started right after cooking potatoes - I wiped the steam off and attempted to cook a second item and this problem started. The magnetron is still under warranty, but the labor charge would probably be ridiculous. Unfortunately, I had to buy a new microwave.

  • davidscales1 Mar 05, 2009

    i have the same problem , and it is the inverter board or power supply board if yo will ... the original part # is f606y6gooap and has been superseeded by part # f6o6y6goocp witch tells me that this was a common factory problem and to fix it they had a factory updated part to the f6o6y6goocp to fix the poor factory part and the cheapest i've found this updated part is 56.00 if you are a dealerand 72.00 if not but that is shipped to your door price

  • Anonymous Mar 19, 2009

    MY OTR BLOWS THE FUSE AS SOON AS YOU PRESS START, I'VE CHECKED THE DOOR SWITCHS AND MONITOR SWITCH, THEY ARE GOOD,AND AFTER UNPLUGGING THE INVERTER BOARD THE OTR WILL RUN FOR ABOUT 3 SECS AFTER START IS PRESSED, AND DOESN'T BLOW TH FUSE, IS IT THE INVERTER BOARD?

  • Anonymous May 25, 2009

    My microwave quits working after 5 seconds and makes a ticking sound

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Ps this part is super easy to change after you get the cover off it is the part in the yellow plastic box ...unsnap the box unplug the three set of wires unscrew the ground strap bend up the tab at the lower left side the same side and behind the ground strap and slide the box and all to the left about 1/4 of an inch and take the box off ... there are 3 screws that seperate the box from the board and the reverse the process... hope this helps .. and if you not sure that this is your problem leave the cover off plug it in and start it lookin the yellow box before it shuts down you will see sparks from the transformer

Posted on Mar 05, 2009

  • davidscales1 Mar 15, 2009

    i changed the inverter board and works like new aftre tax and shipping cost to fix was 85.00

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Davidscales is right-on about the fix. Ordered the part from PartStore.com for $68 with tax and shipping. Changed it out in less than 15 minutes. Back in business. I only wish I hadn't paid $60 to have the problem diagnosed before checking the web.

Thanks David.

Posted on Mar 05, 2010

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  • Panasonic Master
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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.

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

Posted on Dec 28, 2008

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