Question about Microwave Ovens

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I have a NNH964BF inverter type panasonic microwave. Once we press the start button, smoke starts coming from the bottom vents of microwave body and it stops after 6/7 seconds.

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  • Gus May 11, 2010

    This an electronic fault either with the inverter module itself, or it may be a fault in the RF shielding around the magnetron unit.

    Provided you are savy and sensible you can remove the cover to inspect.

    REMOVE POwer and allow to sit idle for a good 20mins before removing hte top cover.

    IMPORTANT 5000v can be present inside the case even with hte power off.

    All your looking for at this point is evidence of where the smoke came from.. DONT TOUCH ANYTHING with fingers, keep one hand behind back or in pocket if you must reach inside. And under no circumstances apply power with the case removed, a faulty mwave can excite water molecules in the human body and cook an eyeball quite quickly. :o)

    It may also be a seized turntable motor that can smoke and overload. I suspect the smoke is from the main inverter module, (Circuit board item with copper coils bolted to the base of unit.)
    you can replace these yourself, but you will need to hunt down a spare.
    But as mentioned like CRT telvisions LETHAL voltages exist inside these units so do be careful. :o)


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  • 8,820 Answers


If it stops after 7 seconds, it has a problem with the inverter.

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.

But if you or a friend do want to look into it, follow the safety warnings in Smogoose's Clarification Request and these safety tips.

Unless you have a lot of troubleshooting experience, you should replace the whole inverter as a unit.

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

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

Posted on Dec 13, 2008

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If it stops after 7 seconds, it has a problem with the inverter.

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I recommend that you bookmark that link to your favorites.We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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