Question about Panasonic NN-S954WF Microwave Oven

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3 second cooking time

After changing the turntable motor, the microwave would only run for 3 seconds no matter how long the time was set.

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  • Panasonic Master
  • 9,098 Answers

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

Posted on Sep 27, 2006

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If microwave runs only without turn table, I am suggest to check if turntable electric motor has got short circuit. If yes, I have some left.

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Your description indicates one or too bad door switches, since there are a few of them a digital meter is required to test them along with the dis-assembly of the microwave oven, due to the high voltage danger I recommend a technician for the job.

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The grinding noise could be from the turntable motor, or the fan. Remove plate from oven and put a cup of cold water in, set for 30 seconds and run the microwave, if no grinding is detected it means the turntable motor is near end of life. If there is no change unplug microwave and remove top check the fan mounts tighten if loose, if straps are tight suspect the fan motor.

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Panasonic Model NN-H2645F Comes on runes 5 or so seconds and shuts off now and then the turntable will try to run


Diagnosing Panasonic microwave oven stoppages:

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter, controller, magnetron, or a bad connection from one or the other.
If it stops at 16 seconds and is a sensor model, it probably has a defective humidity sensor.

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

Or 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://www.microwavecontrol.com/safety.htm
http://www.microwavecontrol.com/disassembly.htm
http://www.microwavecontrol.com/doorsw.htm

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 complexity and 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 you have other questions, please feel free to contact me directly (see below). .- William E. Miller, AS-EET
pupista@gmail.com
http://www.MicrowaveControl.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

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Microwave lights, clock, and everything works except when you press start, it just counts down like its cooking, but the microwave is actually not on. No hum as usual or plate rotating. It just counts...


Hi, one of the most common reasons why the turntable won't rotate is that the microwave isn't clean. The turntable guide and carousel can get sticky, preventing the turntable from properly moving. If you have built-on food particles or liquids, fill a bowl with 2 or 3 cups of water and 1 tsp. of liquid detergent and lemon. Run the microwave for about 3 minutes. Clean the microwave with a cloth, including the base of the turntable, guide, carousel grooves and microwave base. Your microwave turntable won't rotate if the grooves on the base of the turntable do not sit right on the carousel. Also, check the position of the turntable guide. Place the guide directly under the turntable. Remove the turntable, and then reposition it into the carousel grooves.
Motor The carousel motor is located beneath the base plate of the microwave. If the carousel isn't turning at all, check the motor. Disconnect the microwave from the power source, and remove the turntable, guide and base plate. Try turning the motor to see if it's just stuck. If it doesn't turn freely after a few seconds, examine the motor to see if it's burned out or corroded. Use an ohmmeter to see if the motor has continuity. If not, you must replace the motor.
Bushings The drive bushings are plastic components that sit underneath the cooking plate. Remove the plate, and examine the bushings. Use a magnifying glass if necessary to see if any debris is caught in the plastic. Clean the bushings, and reinsert the plate. Turn the microwave on to see if it rotates. If the bushings are extremely worn or if some of the plastic is broken off, you need to replace it, which is a complicated repair for consumers. Contact a service technician for assistance.

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1 Answer

I have a Panasonic microwave convection that runs for 2 or 3 seconds, then cuts off. It doesn't matter what setting or length of time you program into it, it will run a couple of seconds and shut down. Is...


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 and 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.

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

Sep 08, 2010 | Panasonic NN-C994S Convection/Microwave...

2 Answers

Shuts off after approx 5 - 7 sec. some smoke


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

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.

In Canada, you can find an authorized Panasonic servicer here.
If you prefer to replace the inverter yourself, you can find links to helpful exploded view diagrams and part ordering help here.

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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1 Answer

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The motor run's the same speed regardless of power setting.

If 1000 wats is too much for your poor old electric service, then you better not use your A/C.

As for checking voltage, you need to measure the voltage at the plug with the microwave operating.

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