Question about Panasonic NN-SD297SR Microwave Oven

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Panasonic genious model NN-SD297... heard a loud snap, power is still to the unit, it will start but not run for more than a few seconds. no error messages.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave shuts off after 3 seconds

Although your model number doesn't seem to show up, the NNS950-series units are powered by an high-voltage inverter. And yours has failed. While an inverter (switched-mode power supply) is more efficient from a power consumption standpoint, it is more complex, thus more statistically prone to fail. These should only be examined and worked on by someone who has the necessary technical qualifications. Seriously. Often the machine-soldered connections in a microwave inverter are too weak, so they eventually fail, especially if heat is high in the area. They sometimes fail catastrophically. When not catastrophically damaged, you may hear clicking or squealing and may smell an electrical odor, which is sometimes obscured by the cooling fan. Sometimes a whole new inverter is cheaper than the time and labor required to fix the old one. If a technician is willing and able to troubleshoot and repair the inverter to component level, it will may be expensive, but may be worth it, especially if he or she will resolder and reinforce connections as needed as part of a thorough repair. That could easily make your inverter beter than a new one! You might be able to get some verbal estimates if you call Panasonic-authorized appliance / microwave repair shops and ask then specifically about inverter component-level repair and simple inverter replacement costs for your exact model number.

Posted on Dec 28, 2006

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MicrowaveSvc
  • 9047 Answers

SOURCE: panasonic microwave oven model nn-p994sf

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.

Posted on May 22, 2008

  • 1 Answer

SOURCE: Panasonic Model No. NN-S933BF Microwave Oven

could it be that i didn't follow the manuel because i got it second hand or is it because something is wrong with it,and i have to get it fixed.

Posted on Oct 21, 2008

vortash
  • 431 Answers

SOURCE: Comes on for 5 Secs

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

MicrowaveSvc
  • 9047 Answers

SOURCE: my panasonic NN-T945SF starts, runs for a few

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.

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

Posted on Sep 12, 2009

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The service manual is here.

You can order parts from Encompass here.

It may be a bad monitor interlock / short switch, or possibly a shorted capacitor or other problem in the inverter.

But I'm surprised the 20A fuse is not blowing before the breaker is!

I hope it's on at least a 30A breaker...

Let me know if I can help further.

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See this link.

(I understand this is an old post, but answering it now may help someone later.)

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Comes on for 5 Secs


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

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