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Panasonic inverter microwave nn-sn778s turns on for 3 seonds and shuts off ,,no codes in display window

Turntable doesn't turn,fan doesn't come on..just counts down 3 seconds and goes back to time....demo mode is off,,child lock is off

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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: NN-T990SA Panasonic Microwave Stopped Heating

This model uses an inverter to produce high voltage instead of a convential transformer system. 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. Some manufacturers do not encourage or assist technicians to repair microwave inverters. Most offer the inverter as a whole assembly. But sometimes that is actually 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 repair shops and ask then specifically about inverter repair and inverter replacement costs for your model number.

Posted on Dec 23, 2006

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SOURCE: Panasonic NN-S533WF Microwave

because of high voltage circuit thats happend ,please check highvoltage circuit may be short circuit or any companent burntout. check magnetron and high voltage diodes etc.

Posted on Sep 29, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: PANASONIC MICROWAVE NN-K657

To UNLOCK it, press Stop/Clear 3 times.
To LOCK it, press Start 3 times.

You can download your owner's manual here:
http://techdocs.panasonic.co.uk/GetDoc.aspx?did=125787&fmt=pdf&lang=en&src=3

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

Posted on Feb 27, 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

  • 1 Answer

SOURCE: Panasonic NN-H264 1200...stops after 3 seconds

I found sufficient information elsewhere.

Posted on Feb 13, 2009

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1 Answer

Panasonic nn-sn778s microwave shuts off and no heat- H97 is error code


H95, H97, H98 or H99 mean that there's a problem with your inverter, magnetron, or digital programming circuit.

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.

Aug 21, 2012 | Panasonic Genius Prestige Nnsd997s -...

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Panasonic NN-T994SF Microwave Oven quits after 15 seconds


my microwave shuts off after a few seconds. is there a fuse that needs replacing?

Feb 01, 2010 | Panasonic NN-T994SF Microwave Oven

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Panasonic - NN-T993SF 1350 watts microwave


Sorry this is something you wont fix at home I couldent even do this one.This is a nice unit depending on the cost this one I think is worth the repair bill , Good luck DFD please rate me TK U

Apr 12, 2009 | Panasonic NN-T993SF Microwave Oven

1 Answer

NN-A574SBBPQ - Microwave fans & turntable not working


2 fuses in a panasonic does not sound enough.
have you checked the main incoming power protection fuse normally 10amp or higher.
most panasonics have approx 4 fuses so keep on looking

Feb 10, 2009 | Panasonic NN-S961 Microwave Oven

1 Answer

Nothing works except the display


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.

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

Dec 25, 2008 | Panasonic NN-S961 Microwave Oven

1 Answer

My panansonic microwave NN-T573SBBPQ works for 2-3 seconds then turns itself off! the lights all work, turntable goes around, fan works, time is on.


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.

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.

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

Jul 28, 2008 | Panasonic Microwave Ovens

2 Answers

No power


what was the problem in the beginning before replacing the power inverter ?? most of the main problem is the DISPLAY PANEL that needs to be replaced ( membrane circuit ) and to be honest with you , is not worth it to replace it cause the price you going to pay , you better off purchasing a new one . now days we call it THE DISPOSABLES MICROWAVES . hope this helps

Apr 18, 2008 | Panasonic NN-C994S Convection/Microwave...

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