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Inverter Microwave Panasonic NNSD277B. The fuse is blowing as soon as I touch start. It's not the turntable ( i turned it off) and it's not the fan on the side (i unplugged it)...Any Idea.....? Thanks a lot

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Posted on Jan 02, 2017

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  1. Same exact problem
  2. I've noted 3 different ones with the same problem
  3. Panasonic has produced a lemon, north fixing

Posted on Apr 11, 2008

  • 1 Answer

SOURCE: frigidaire microwave gallery series turntable is not turning

This co. has one for $19.99

I am also looking elsewhere

Posted on Apr 27, 2009

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SOURCE: Panasonic Microwave NN-A770S getting hot on right side externally

Is it normal for a Panasonic nn-c994s to cycle the fan/inverter
when using combination cook?
16 sec off 6 sec on.
Everything else seems to be working
light, timer counting down, heating food, turntable turning

Posted on Jul 17, 2009

  • 2992 Answers

SOURCE: My Panasonic Inverter Genius Sensor 1250W Lights

This is most likely because of a faulty interlock monitor switch, operated by the door latch. If it thinks you're running the oven with the door open it will cause the fuse to blow (or trip a circuit breaker in your case). The switch may be bad (not opening as it should when the door is closed) or out of adjustment.

The switch is replaceable and it's not a costly part. You should have microwave service done by a professional, especially if it involves the door. There are potentially lethal voltages present with the cover off, and the possibility of microwave leakage is the repairs aren't dome properly.

Hope this gets you cooking again. Thanks for using Fixya!

Posted on Feb 17, 2010

  • 9085 Answers

SOURCE: microwave runs for 3 seconds and stops

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 , and

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.

Posted on May 31, 2010

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1 Answer

I have a Panasonic inverter microwave. Was working perfectly an hour ago. Now totally dead. There is no light or anything. Have checked plug and fuses. No smell or anything. Can you please help.

Could be a shorted inverter blew fuse and unit dead. Or bad fuse holder got fuse hot and melted fuse so now unit dead. Must check fuse first and if bad replace and try, if it blows as soon as it tries to heat probably bad inverter. If it works for a long while then quits maybe bad fuse holder not grabbing fuse tightly making it over heat. So then bad by temperature not amperage.

Jun 20, 2017 | Panasonic Microwave Ovens

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Why won't my panasonic inverter microwave will not turn on?

check when the fuse is blown,means inverter unit is faulty

Aug 05, 2014 | Panasonic NN-S251 Microwave Oven

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Why does my microwave turntable turn when I open the door?

We recommend you have the microwave evaluated by an authorized service center.

Authorized service centers can be located in the below link.

May 01, 2014 | Panasonic NN-H965WF - Microwave Oven...

1 Answer

Microwave starts then quits, turntable doen't turn

At this time we recommend you locate an authorized service center using the below link. Welcome to Panasonic Online Repair

Apr 03, 2014 | Panasonic Microwave Ovens

1 Answer

I have a Panasonic microwave md # 6523A that just stopped! Is there a fuse that could be replaced? Rob

yes there is an internal monitor fuse you have to take the cover off of the unit but be careful microwave ovens have a high voltage capacitor in them that will store power even when unpluged,if you turn your oven round then you will see the screws that hold the cover on remove them and lift the cover off as you lift the bottom of the cover you will need to slide it backwards towards you where your mains cable goes into the back of the unit you will find a pcb on that pcb there will be twq fuses one class and one ceramic it will be the ceramic fuse that blows normaly but allbeit slamming the door can blow the fuse it can be another fault that blows it ie if your unit is an inverter microwave it mite be the magnetron or the inverter pcb or the turntable motor if it does not work when you fit the new fuse then a repair shop is best good luck and do unplug the unit before taken the cover off

Oct 09, 2009 | Panasonic Microwave Ovens

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

2 Answers

Panasonic Microwave NN-A770S getting hot on right side externally

If you described this to Panasonic very carefully, and they said it's normal, then I would say keep using it until such time that you get other symptoms. The inverter has some parts mounted on a large chunk of aluminum called a heat sink. It draws the heat out of the parts and the heat radiates and/or convects away. This keeps the circuit parts from overheating. As long as you have good air flow through the vents, it sounds okay.

Sep 13, 2007 | Microwave Ovens

2 Answers

Panasonic 1100W high power

It may have a blown fuse or - assuming yours is a model NN-H965 - a defective inverter. The fuse is generally located on the bottom of the chassis of the microwave. You have to remove the outer cover on a counter top model - or the front panel assembly on an over-the-range model. There are several reasons why it may blow. If the fuse is loose in the holder, the fuse and the holder should both be replaced. If - with the microwave disconnected from the wall - you can easily turn the fuse with your fingers while it's in the holder, then it's too loose. What happens is the loose connection generates too much heat, causing it to melt internally. If so, you'll usually see a ball of solder at a point where the cap meets the body of the fuse. If the fuse blows as soon as you plug the oven in the wall, or when you open the door, the problem is likely with the door switches. You can find my files "doorsw.txt" and "safety'txt" via Google. They give you the safety warnings and cover the diagnosis and replacement of the door switches. If the fuse blows as soon as you hit START, then it's likely that you have a shorted high-voltage capacitor. If the fuse blows a few seconds after you hit START, then it's likely that you have an overheating / shorting high-voltage transformer. 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 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. They 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. Be safe!

Oct 13, 2006 | Panasonic NN-H965 Microwave Oven

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