Question about Panasonic NN-SN657SMicrowave Oven

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Shuts off after 15 seconds

Panasonic Genius 1300W microwave. Runs for about 15 seconds with audible fluctuation of power and a clicking noise, then shuts off. It's only about a year old.

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Sounds as if the magnetron has gone bad.this part of the machine is still under a warranty,and you need to call for a service technician to look at it.

do not use the unit until you get someone to look at it and or replace it.

Posted on Jan 31, 2010

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Posted on Jan 02, 2017

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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.microwavedisplay.com/safety.txt , http://www.microwavedisplay.com/disassembly.txt and http://www.microwavedisplay.com/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.

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1 Answer

[Identical to earlier posting by stefeckstein]


Check for a circuit breaker on the back. If nothing, pull the plug and remove the case. Look for a blown fuse. If so, look for a shorted high voltage diode in the magnetron power supply or a shorted stirrer bearing located above or beside the cavity area where the microwaves enter. The stirrer is a metal fan-like device with a plastic bearing that often arcs internally. That shorts the microwaves out and blows a fuse. Replace the stirrer.

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My Panasonic Microwave Genius 1300W will not heat up the food and the rotate dish spins and the sensor reheat will not heat up the food. Nor cook Pop Corn when pressing the buttons to 2:00 cook time. I...


Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.

The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


Benjamin

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No sorry the issue will be with eiher the inverter, the magnetron or the main timer board. There is a tracer signal that comunicates through these components and if it doesnt get to where it is supposed to go it wil just shut off, the big hint at that is the time interval. It is not something like a sensor heating up and causing a fault. it is not running long enough to get any thing hot it is in the electroincs. Too expoensive to repair, im sorry better to get a new one. Good Luck

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Microwave runs for a few seconds then stops


In most cases, this is 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.

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

We're happy to help and we appreciate your thoughtful rating of our answer.

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