Question about Panasonic NN-P294SF Microwave Oven

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Panasonic Inverter Microwave, NN-H665BF, Smoking Issue

Made in June 2006. Seems as if many people have had this same smoking issue. Tonight we microwave some corn for 3 minutes....threw in the green beans and set it for 3 minutes...hit start and after about 4 to 5 seconds smoke started rolling out of the bottom of the microwave. Took the microwave out to the garage for a retest....and sure enough...smoke rolled out of the bottom of the machine in 4 to 5 seconds each time. They say it is the inverter that is weak in these units. I am assuming this 1.5 year old microwave is history? Is it true? I had a Tappan microwave for over 11 years with no problem. What brand microwave is good to buy for durability and power(1300W+)?

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  • crossi Mar 15, 2009

    Hi - I've had the same problem on my NN-H665BF. I've pulled the inverter from mine. If I find a place to buy a replacement inverter, I'll post it here.

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The magnatron is covered by warranty for 5 years and I just spoke with an authorized Panasonic repair center who said the inverter is covered on this unit depending on the manufacture date, like april 04 to october 05 approximately.


Posted on Nov 05, 2009

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It is smoking. Could this be the magnatron or is my microwave toast?


It really depends why it is smoking.
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Call an aproved engineer and get it checked.

Mar 16, 2011 | Panasonic NN-S541 Microwave Oven

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Microwave does not heat.


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Our microwave oven Panasonic NN-S252WF stops after


Our technician suggest that there may be a problem with the Inverter Board in this model, which is something that would need to be looked at by a Service Center.

In rare cases it could be the door switches.

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Turn on, but I don't har fan and it startd smoking.


I would suspect a problem with the high-voltage inverter.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

I would recommend that you contact your nearest Panasonic-authorized servicer.

You can find one here:
http://www2.panasonic.com/webapp/wcs/stores/servlet/vServiceLocator?storeId=15001

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Panasonic NN-T694SF smoke, shuts itself off


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Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

I would recommend that you contact your nearest Panasonic-authorized servicer. You can find one here:

http://www2.panasonic.com/webapp/wcs/stores/servlet/vServiceLocator?storeId=15001

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