Question about Panasonic NN-S254WF Microwave Oven

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I have a Panasonic NN-s254wf over the range Microwave. This morning it wouldnt turn on. The main cct breaker is on, so I'm thinking a internal fuse has blown. Do I need to take it down from its mounted position to get at the fuse, and where would it be? Thanks very much for your help

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  • Murray Boston Nov 10, 2010

    This solution was helpful. It was the internal fuse. It was rated 18a/250v. I used a 15a fuse. I my case however the high voltage cap was not easily accessable, so I could not short it out. I was very careful and bench tested the microwave before re-assembling . Everything works fine. Gave me a good opportunity to clean the inside of the unit out.
    Thanks for your help.



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Yes you will need to take it off the wall to access the internal ceramic chemical fuse,it takes 2 people to safely accomplish this task,when off and on a solid working surface remove the outer cover,thgere may be security screws,torx screws which require a special screwdriver,then with the outer cover off the fuse will be in a special clip holder and has a white colored body with 2 silver ends,this is what is called the ceramic fuse either 15 or 20 amp at 125 or 250volts its stamped on the end,before you replace the ceramic fuse,you need to first take 2 insulated screw drivers and short the terminals together on the high voltage capacitor to make sure its discharged(they can store 2100volts A.C.) when the unit is first turned off,some do employ a resistor internally across to do this automatically,but DON'T take a chance,then check to make sure either the high-voltage cap or high voltage diode isn't shorted out with an ohm-meter,because if so the new fuse will again blow,the cap will say something i.e. 1,05 UF at 2100 volts A.C. on it,and the diode can be square or round usually black in color and have an arrow pointed and touching a straight line on the body with 2n lines on each side representing leads,it may have a spade lug on one end and a ring terminal on the other end check these both....good luck....please rate this info on fixya if it assisted you in the repair.thank you..daniel

Posted on Nov 07, 2010


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There is no power coming into my microwave which is a panasonic nn-L531WF model. I think it's the fuse. How can i change the fuse?

Dead appliance, power on wall outlet.


Attempt this only if you are competent.

If your appliance has absolutely no functions at all, remove it from the mains supply, remove the case and see where the mains lead goes in to the appliance and follow the cable until you find the main fuse.
The usual cause of this fuse failure is the door switches are contaminated or sticking. Check the door switches before putting power back on to the appliance.
Hope this helps.

Jan 18, 2011 | Panasonic NN-L531WF Microwave Oven

1 Answer

Discussion on the appearance, aesthetics, form and colur

Hello dutch.

This is an excellent microwave, over the range, white only. Here is a link to all of the features, and even the owner manual
Microwave Type: Over-the-Range Cooking Power: 1200 Watts Capacity: 2 cu. ft. Convection Cook: Without Convection Cook Dimensions Exterior Depth: 15 in. Exterior Height: 9.5 in. Exterior Width: 23.25 in. Miscellaneous Product ID: 22541798 More Information Details: Over the Range Microwave with Panasonic Inverter Technology provides true multiple power levels. When the user asks for 60% power, the oven delivers a true 60% power, not a pulsed delivery of 100% power 60% of the time. This method is called linear power delivery

Dec 08, 2010 | Panasonic NN-S254WF Microwave Oven

1 Answer

I have a panasonic inverter microwave model 1250w and does not heat up, everything else works fine

its likley to be the magntron burnt out,,(thats the bit that heats the food up) its a pricy part to buy and have fitted,,it may be a lot cheeper to buy a new unit

Jun 20, 2010 | Panasonic NN-S254WF Microwave Oven

1 Answer

The light under the oven that lights up the stove top cannot be shut off...the button on the keypad works(sounds off) and the lights dim slightly but the control will not shut them off...Had to remove...

We see (and repair) this a lot. The problem is on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid in about a week.

At our Web site, you can get details of our service, plus we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

Sometimes this will also affect the exhaust fan operation, too. The lights and fan can be inoperable or stuck on too.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

If you wait too long for the repair, other parts can short, destroying the microprocessor (as shown in the second photo) and rendering the oven dead.

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

William E. Miller



Feb 28, 2009 | Panasonic NN-S254WF Microwave Oven

1 Answer

No power to Panasonic NN-S252 microwave oven

follow the incoming mains lead into the microwave their is a small pcb with a fuse their check this first

Nov 14, 2008 | Panasonic NN-S254BF Microwave Oven

1 Answer


The owner's manual should tell you.

If you don't still have it, you can download it here.

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

Sep 09, 2008 | Panasonic NN-S254WF Microwave Oven

1 Answer

I have a Panasonic microwave model nn-sa616wx sn 58100747 it keeps triping the breaker after it operates for awhile we have taken a amp reading and it draws 17.2 amp.This is a new microwave.

Safety first, unplug your microwave from socket outlet.Needs to troubleshoots series of components using eliminating method to know which component(s) that causes breaker to trip off. It is obvious that a componet(s) "shorted out".Remove your fuse and replace it with resetable breaker tested.
Remove leads of the transformer output(secondary side). plug power cord run the microwave.If does not trip off the cct breaker change your transformer. do the same to capacitor lead, one after the other until you discover which component that shorted and cause your cct breaker to trip off.

Jul 24, 2008 | Panasonic Microwave Ovens

1 Answer

Panasonic NN-S254B How fried is it?

There is an internal fuse, so check that first. If the fuse checks ok, definitely buy a new microwave - losing a neutral usually damages the main circuit board. Given the cost of the board and the distance involved, it just wouldn't pay to chase the parts down

Jun 18, 2008 | Panasonic NN-S254BF Microwave Oven

2 Answers

Unit does not turn off

open the control push boton and clean it one of the boton stoct.

Sep 19, 2007 | Panasonic NN-S254WF Microwave Oven

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