Question about Panasonic NN-H275 Microwave Oven

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Heating ceases after 2 to 3 seconds. I tried to take out the main plug thinking it would restart the machine, The machine worked for some time then again started to cease after 2 seconds. This has been happening for the past 5 months but there are times that it really worked inconsistently so we didn't bother to call for help yet. But this time is really worse. Please tell me what to do. Thank you in advance.

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  • Panasonic Master
  • 34,153 Answers

The problem could be intermittent failure of the magnetron ot possibly faulty wiring of the door interlock.

Posted on Jul 27, 2017

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Posted on Jan 02, 2017

  • 518 Answers

SOURCE: microwave heated food an hour

A make and model would have been nice, but try unplugging it from the wall outlet for 15 minutes.

Hope that helps...

Geno

Posted on Mar 26, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: heating ceases after one second

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.

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 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.

Posted on May 31, 2010

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Heating ceases after one second


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.

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 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.

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First, please unplug the oven before you investigate.

The best idea is to clean the probe socket contacts.

You'd need to remove the outer cover, and the probe socket should be located on the right side of the chassis.

If you can cut thin strips of fine sandpaper and work them back and forth between the contacts, that's the best way.

You can plug & unplug the probe while observing the socket to see how the contacts work.

Your socket may be sealed, and that would possibly require you to carefully take it apart. That's a bit of a gamble, as it may crack due to age.

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Then plug & unplug the probe several times, wipe any spills and try the oven again.

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If that doesn't do it, and your line voltage is right, then I would say your magnetron is dying.

Slow is heat is a typical symptom of magnetron failure.

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

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A make and model would have been nice, but try unplugging it from the wall outlet for 15 minutes.

Hope that helps...

Geno

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