20 Most Recent Panasonic NN-SN657SMicrowave Oven Questions & Answers

Sure sounds like it is losing power. First check the fuse and fuse holder. These companies are using really cheap fuse holders and they do not grab the fuse tightly, thye get hot and start to melt the fuse. Remove the fuse and look for signs of heat or flux running from the silver ends of the fuse. if you see signs of it being hot I would replace the fuse and fuse holder. Make sure ALL connections are tight and give it a try. I search long and hard to find fuse holders I like and can trust to do a long term repair. if you cant count on a part, the repair wont hold up and then Its MY reputation that suffers, Damn companies always choosing the cheap way out on making parts. When I started repairing Microwaves, a Home Microwave cost about 800.00 I see them sell at certain stores for 18.88!!!! how can you have good parts in there for 18.88?? Nobody makes things to last anymore. SAD!!! Fill The landfills and buy a new one. except the new one is Cheap Garbage!! Since it goes blank it sound like it is losing power. Always could be outlet you have it plugged into. Try different location first, on different breaker

Panasonic... | Answered on Aug 18, 2017

I don't believe it is possible to change the display angle/tilt on this microwave. The unit ships with a protective film over the display that should be removed to make the display easier to read. However, this model is known to be difficult to read unless looking at straight-on. That and needing a flashlight to look at your food with the door open since the internal light does not stay on when door is opened. Good luck!.

Panasonic... | Answered on Jun 14, 2014

The microwave is defective. If you owned it less than 90 days, take it back to the store but get a different brand of microwave. A few people purchased the same one that you bought and in lasted less than 1 year. The problem. It does not work at all.

Panasonic... | Answered on Jun 05, 2014


Panasonic... | Answered on Jun 04, 2014

We have a Panasonic Inverter microwave. Door became difficult to close and had to slam it hard while holding themicrowave to keep it from moving. When opening the door did not pop open but did unlatch. I ordered a new door lever from Panasonic. When got part I removed case from microwave and lever was okay. I then removed the perimeter strip on the inside of the door. With a screwdriver I stretched the spring at the bottom that keeps the door latches pulled downward. Spring still worked just not as stiff. Put perimeter piece back on the door and replaced housing (which I didn't need to remove in the first place), and then put a small drop of vegetable oil on the cams where the door latches hit when closing door. Viola, door opens and closed as new. Problem solved. Diagnosis: over time the latch tension spring hardens and gets too stiff. P.S.: I had several similar springs as backup in case I screwed up the original one.

Panasonic... | Answered on Jan 11, 2014

What brand is it? Check with the manufacturer. There were recalls announced because of fire hazards from microwaves starting on their own later. Unplug the unit now.

Panasonic... | Answered on Feb 15, 2013

You may have a shorted door switch or a shorted relay on the control board.

You can see a help file on door switches here.

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

Panasonic... | Answered on Dec 01, 2012

If your owner's manual doesn't refer to changing a bulb, then you will have to disassemble the oven to do so.

See these links before proceeding:

Panasonic... | Answered on Oct 26, 2012

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 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.

Panasonic... | Answered on Aug 26, 2012

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