Question about Panasonic NN-S254BF Microwave Oven

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I opened it from the right side where electric circuit is just behind the front panel, and found a blown 18A fuse, replaced it with same exact fuse and still keep blowing fuses.

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The problem is most likely in one of the door switches, food particles build up causing it to stick or the switch contacts gives out.

Posted on Mar 22, 2011

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It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.


This is a job for a professional but if you are safety clued up, here's instruction.

If it is the type with an "Invertor", they are not user serviceable and must be repaired by an authorised Panasonic agent for continued safety, otherwise if conventional;
Make sure the !!!!any capacitors are discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Posted on Mar 22, 2011


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How to open front ge over the range microwave fuse\

Hello guest.
Before you attempt to repair a microwave oven yourself, you have to have and know how to use a multimeter, whether it is analog or digital. You need to be able to determine what components to check and what to look for. If the main fuse is blown (open) you need to check all of the components in the high voltage circuit before you replace the main fuse. You MUST know how to discharge the high voltage capacitor before you put your hands or test leads in the general area of the high voltage section. It can easily kill you if you are not careful to respect it properly. I take it that the unit is "dead". No display, and it acts like it is unplugged from the wall. If the main fuse is good, there are typically two or three temperature or thermal 'fuses' besides the main 'line' or 'monitor' fuse. Some of these are self resetting and some are a 'one time' type. Before you even open up the microwave, you need to verify that the power to it is valid. I don't mean to sound condescending but I don't know your level of familiarity or experience. To gain access to the area behind the control panel, you typically need to remove the louvre or the top panel above the door and control panel area. With that out of place, you should see one to three screws holding the control panel escutcheon in place either on the top or the side of the panel. Some panels are mounted differently, hinge outward, hinge down, etc. You may or may not find the fuse holder once inside that access area. Again, BE CAREFUL and make sure that there is no electrical power in the area that you are working. Good luck.....

May 27, 2014 | GE Spacemaker JVM1640SJ Microwave Oven

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How do I open it up to look for a blown fuse to circuit breaker?

When you remove the front control panel you will see the two fuses in the next internal section. Below are instructions for removing control panel:

You can do this without removing unit from wall. First unplug unit. Next remove the two screws on the top of the unit closest to the front. These screws simply keep the up facing vent in place. Next slide the vent to the left (plastic latches on bottom hold in place) to allow vent to be removed. You should now see a single screw above the control panel. Remove it then open the microwave door. Gently slide the control panel up which will disengage the plastic latches on the panel sides. Suggest if you are going to remove the controller and replace take a picture before removing it so you know exactly how to reconnect all the wires.

Dec 16, 2012 | Samsung SMH8165W Microwave Oven

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Where is the fuse located on the samsung smh9187 otr microwave

There are 2 screws on top that release the top vent. Under this is a single screw that releases the front control panel. Behind the control panel are 2 fuses. Mine are 20 amp. I'm heading to radioshack now to replace the one that is blown. Lowes has them but I have found Radioshack to be a little cheaper. Lowes use to, but they found they can charge 5 times what they are worth.

Jul 10, 2011 | Samsung SMH9187ST Microwave Oven

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There is no electricity getting to it. Just dead. Is there a fuse or something I could look for? Help

You can download the online parts List and service diagrams for your model at the following link:

To view the service diagrams just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated. Then just enter the model number of your microwave oven.

You may need ADOBE READER installed on your computer to read PDF documents like the diagrams.
You can download this free at WWW.ADOBE.COM if necessary.
Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, then follow the onscreen instructions to install the software on your computer.

I will assume you have checked the house's main circuit panel for any tripped breakers and tested the electrical wall outlet for a good power supply. Reset the house circuit breaker at the panel if necessary.

Otherwise, hopefully the problem is just a blown main fuse inside the microwave. In order to access and check this you will have to disconnect the power cord and then remove the oven from the wall if it is an overhead model. Then remove the case in order to access the electrical parts inside.

Components inside the microwave like the main capacitor can remain EXTREMELY dangerous even after the power cord is disconnected. So if you are not familiar with basic electrical safety precautions when working with this type of equipment, then you should leave this kind of task for a trained appliance technician.

Here is a picture of a generic main fuse for a microwave:

Just replace the fuse with an exact match and reassemble. If you tested the old fuse and it was still good, then you may be dealing with a more complicated and expensive fix possibly involving the control panel circuit board. At that point you may want to consider seeking additional assistance or just getting a new oven.

Thank you very much and good luck.


May 19, 2011 | Microwave Ovens

1 Answer

Panasonic NN-C980B stopped working. Blown fuse.

Sometimes when the mag shorts it takes out the inverter. I would measure the mag leads to ground and they should be open or 20M or so. If you have both a mag and inverter bad it's probably time for a new oven.

Apr 19, 2010 | Panasonic NN-C980 Convection/Microwave...

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My spacemaker stopped working and no panel lights. It's not the circuit breaker. Any ideas? model JVM140001

Could be the fuse inside the microwave is blown. You will need to unplug the microwave and remove the front control panel. Inisde the microwave housing you will need to trace the electrical wire coming into the unit. Usually you will find the in-line fuse located on the black power wire. You can pull the connectors off the fuse and test it with a continuity tester. If the fuse is blown replace it but make sure you use the same amp rated fuse as you removed. If the fuse blows again then there is an electrical short somewhere in the microwave.

Dec 24, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer


most likely the internal fuse
be soooooooooo carefull in replacing this , the capacitor inside the machine can store a huge charge

  1. Turn off all electricity to the microwave and unplug from the wall socket. Move the unit to a well-lit location to better see the appliance.
  2. Step 2 Usea schematic for the particular model of microwave being worked on tolocate the area containing the fuse to be replaced. Fuses can belocated behind the microwave door or behind a panel either on theinterior wall or an exterior panel. Often the fuse will be behind apanel located under the louver vents on top of the microwave.
  3. Step 3 Removethe panel according to the manufacturer's instructions. Use a screwdriver to remove screws and set aside for replacement.
  4. Step 4 Locatethe blown fuse and check with a voltmeter. This step ensures that theproblem with the microwave is indeed a blown fuse and not anotherissue. Check for current between fuse connectors.
  5. Step 5 Take the blown fuse to a local hardware or store such as Lowe's or Home Depot. Staff can assist in finding the exact replacement fuse for the model being repaired.
  6. Step 6 Placethe new fuse into the panel in exactly the same fashion as the blownfuse came out. Replace any panel using the removed screws and returnthe unit back to its proper location.
  7. Step 7 Plugthe microwave into the wall socket and turn on all electricity. Testthe unit by ensuring the clock and all other features function.

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Fuse location ge spacemaker under the counter

it is behind the control access that remove the top grill by removing two screws on the top or in the fron of grill.then u should see see a screw on the top of control panel holding it.remove that screw and u should be able to remove the control panel.fuse will be behind the is not mounted on the panel but in the cavity behind it.

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Kenmore Elite Microwave Oven (mod 565.61589011). No power or display suddenly. Circuit OK and no traumatic episode to suggest cause.

usually it is the fuse that blows out.if u remove control panel u cna see 20 amf fuse behind if.chk for continuity.if open replace it. it also could be the cavity thermal cut off must have blown out if cooking is done 4 long is mounted on top of cavity. similar way as fuse chk 4 continuity.if open replace it

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I cannot get my unit to turn on

Service manual can be got here...

There is a small ceramic 18A fuse located on the circuit board behind touch pad. You have to remove the top and wrap around panel to get at it. Had same problem, my fuse was ok though. My problem seems maybe in dor switches.

Hope yours is just a fuse. Good luck!

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