Hi again Jake,

I have an issue with a Panasonic NN-t99sfr. One would enter the heating time and press start. The microwave would run for 2 seconds and then just stop. If we select the "sensor preheat" button and press start, the microwave would run a bit longer and stop. If I repeat the last step a few times, at the point where the microwave would normally just shut off, you can see a draw in power, the microwave will change speeds and at that point would start heating. Once this occurs we can heat something for a few minutes here or there and then the microwave would start acting up all over again. I unplugged it and left it unplugged for 30 seconds. That did not work, I currently have it unplugged and plan on leaving it unplugged all night.

Hi,

Model# won't come up for me, found a couple close...

NN-T993SF NN-T994SF

Quote:

One would enter the heating time and press start. The microwave would run for 2 seconds and then just stop

More often than not a bad magnetron and inverter board.

jeff.

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Yes sir, it is the NN-T994SFR. Thank you for pointing it out. Bad magnetron or inverter board? Is there a schematic or diagram to this unit available? Do you guys have it/them available?

Not in the unit any more....will have to ask Panasonic.

jeff.

__________________
http://www.applianceaid.com/
Appliance Repair Aid
http://www.jrappliance.ca
JRAppliance

Jeff and Candela,

I also have a Panasonic Microwave NN-T994SFR, and it seems to be malfunctioning the same way. When I press start, it makes a soft, intermittent buzzing sound 4 or 5 times and then turns off, total on time about 20-25 seconds. Were you able to fix your unit? If so, was repair was required?

Thanks, MissoulaJim