Question about Panasonic NN-S443WF / NN-S443BF 1200 Watts Microwave Oven

1 Answer

Micro Wave shuts down

My Panasonic Micro Wave, model NN S443WF, shuts down after 20-25 seconds no matter what time or cooking style is selected.

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  • 3 more comments 
  • kpp6 Nov 25, 2008

    Thanks for your help and the voltage warning.

  • ridanna Mar 11, 2009

    Model Panasonoc Inverter NN-S543BF runs 20 to 35 seconds then shuts off Do you have a solution

  • Anonymous Mar 17, 2014

    I need manual for Panasonic convection micro wave nn-cd987w. Manual lost. Is this possible

  • Anonymous Mar 24, 2014

    it is in an r/v

  • Anonymous Mar 26, 2014

    Product code.MS3949C.CSLQSAF

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  • 8,820 Answers

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter or a bad magnetron.

Due to the lethal voltages used and produced, 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 Nov 24, 2008

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1 Answer

NN-T563 shuts off after 5 seconds


We recommend you use the below link to locate an authorized service center. Panasonic microwaves have a 5 year warranty on the microwave.

www.panasonic.com/repair

Apr 12, 2014 | Panasonic NN-S563 Microwave Oven

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No mater time salected only cooks for 17 seconds


i think you have a problem with your magnetron or the inverterpcb if your unit has inverter inside writen on the front it could be an expensive repair please contact me to let me know iffell up to tackling this repair as it can be dangerous

Dec 09, 2012 | Panasonic NN-T888S Convection/Microwave...

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Micro wave starts and runs for 2 seconds then shuts down


See if this describes what's happening:
  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see http://207.234.249.73/mwd/safety.txt http://207.234.249.73/mwd/disassembly.txt http://207.234.249.73/mwd/doorsw.txt

Otherwise, 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.

That 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.

In Canada, you can find an authorized Panasonic servicer here.

If yours is not a Panasonic, please reply back with your brand and model number so we can help you.

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

Aug 22, 2010 | Panasonic NN-H275 Microwave Oven

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Model JVM1650WH02 will shut off about 2 seconds or less into cook time. everything else works such as light and clock and sometimes the wave will cook.


magnetron is leaking internally, do not use until magnetron is replaced. the mag creates interference with the control board and resets it

Feb 05, 2010 | GE JVM1650 1000 Watts Microwave Oven

1 Answer

Oven won't heat and shuts down after approx. 20 seconds


If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter or a bad magnetron.

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.

Dec 18, 2008 | Panasonic NN-S763BF Microwave Oven

1 Answer

Buzzing Microwave


the buzzing is the magnatron tube juicing too thousands of volts before emmitting the micro-wave radiation to what your cooking that turns molecules 180 degrees around... guess that friction is what really heats it.
radar ovens is what they use to call em and even people would stand in front of big ones to warm up long ago...lol canibles will love that.

Jan 11, 2008 | Panasonic NN-T990SA Microwave Oven

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Microwave shuts down after 5 seconds


chech the control panel and wiring and thermal sensors..

Sep 23, 2007 | Panasonic NN-H965 Microwave Oven

1 Answer

3 second cooking time


It's possible a sensor or thermistor got unplugged during your work and didn't get plugged back in. Otherwise, I would suspect the microprocessor got "glitched". If so, *maybe* unplugging the oven from the power line for a few minutes will reset it. Or maybe the unit has a reset button or another reset procedure (I doubt that, but check the manual). Sadly, another common cause for this is that the code in the microprocessor gets irretrievably corrupted. In such cases, we can replace micro if it is available. It it's no longer available, that would make the whole microwave a goner. Looks like both the micro (LSI display) and the whole control board for this model are available from Panasonic parts: http://www.pasc.panasonic.com/epartr

Sep 27, 2006 | Panasonic NN-S954WF Microwave Oven

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