Question about Panasonic NN-S262SF Microwave Oven

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Comes on for 5 Secs

My Microwave starts up for five seconds then stops,A louder than usual sound is heard as if a relay is clicking on count of every second before it comes to a stop. Panasonic NN S262SF over the oven mount type

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Hi I am Vortash sounds to me as if the Magnetron is burning out and the heat sensor switch is turning the unit off as the mag gets hot ? .. you can get a cheap replacement of ebay but to be honnest microwaves are so cheap now you will probably get an oven for what you would pay for a new magnetron .. Regards Vortash

Posted on May 21, 2009

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Microwave starts as normanl but cuts out after 5 seconds on all settings?


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Panasonic microwave does not work for more than 3 secs.


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 them.

You can find many Panasonic owner's manuals for free download here.

You can find an authorized Panasonic servicer here.

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

If you're not in the US, see Panasonic.net.

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

Dec 04, 2009 | Panasonic Microwave Ovens

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I have a panasonic slimline combi NN A554W which was not cheap. worked well until this week. put timer on to microwave and it goes down 5 secs then turns of. A clicking noise can be heard. Clock working....


, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Then you unplug the keypad (as per the photo below) and move the circuit board into your frame.

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

34374fd.jpg

Some connectors on the relays may have a lock:

positivelock.jpg
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 many Panasonic owner's manuals for free download here.

You can find an authorized Panasonic servicer here.

In Canada, you can find an authorized Panasonic servicer here. If you're not in the US, see Panasonic.net.

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

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When you hit Start to cook, do the inside light, cooling fan, and turntable come on?

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These answers will help me judge whether it's in the high voltage section (magnetron, transformer, or diode) or the control section (door switch or control board relay or connection).

Nov 27, 2008 | Microwave Ovens

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Microwave quit


I would suspect either door switches or an intermittent control circuit board, either of which can be repaired. Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure over time. I have a text file on my site called "doorsw.txt" which helps in diagnosing and repairing door switch problems. You can find the file via a Google search. It will help you check and replace the door switches if you or an able friend is so inclined. In some cases, the problem is a bad connection or a bad relay on the control board. That's something we see fairly often, and we repair them for only $32.50 nationwide.

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