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Panasonic NE1856 microwave. Located in small food shop. F3 fuse blows after 1/2 day of use. Fuse does not blow straight away. Have checked all the door switches.

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It may be a failing high voltage transformer, or some models have a voltage selector on the back, and if it's not set to match the measured line voltage level at the outlet, that can cause fuse blows.

The service manual for this UK model is available for purchase / download online. You can check these Google search results.

(NOTE: Those links are not mine and I do not have this manual for sale. If I had it, I would offer it to you at no charge)

If you decide to buy the service manual and will send me at least the schematic page, I can probably tell you what's wrong or what I most strongly suspect after seeing the overall circuit.

Feel free to contact me directly for more information & help.

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

William E. Miller

Posted on Sep 25, 2008


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Panasonic microwave keeps blowing fuses jus put in a new fuse but after a few days blowes another fuse

This is a common problem with microwave ovens and is easy to diagnose. Whenever I replace the fuse, I always perform this test. I don't want the unit coming back in a couple of days with the same problem.
Install a known good fuse. It should be a 20 Amp, Slo-Blo, with a ceramic body. Leave the cover off. Place a container with at least 2 cups of water inside the unit. Cook on high for at least 5 minutes. As soon as it finishes, UNPLUG the unit and feel the fuse. If it is extremely hot, the fuse is going to fail in a short period of time. The fusible material inside the fuse is melting from this excessive heat. It only takes a small amount of resistance at the fuse holder contacts to create this amount of heat. Replace the fuse holder rated at least 20 Amps. The higher the better.

Nov 30, 2017 | Panasonic Microwave Ovens

1 Answer

I have a panasonic model nn-sd277 microwave. I changed the fuse and now it has power again. The fan and light all work. It trips my breaker and sometimes blows the fuse when you try to heat anything.

time to take it to an appliance repair shop for a quote
it is blowing fuses and tripping breakers because it has a serious short in the electrics

Jan 03, 2016 | Panasonic Microwave Ovens

1 Answer

Why does the 1.3A fuse keep blowing on the power board of a Panasonic NE1856 microwave oven.

most likely a defective component (capacitor, or resistor, relay, etc.) is drawing more than 1.3A (ampere).

Oct 07, 2015 | Panasonic Microwave Ovens

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Why is my GE Advantium SCA2001 blowing the main fuse?

Yeah pal, you've not gone deep enough yet. You'll find a power wire bare inside the unit, pull it apart and tape that wire up to stop it from grounding out and blowing the fuse.

Aug 31, 2014 | GE Microwave Ovens

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I have an over the range DAEWOO MT1510W Microwave i think the fuse blowed my manual doesn't show where it located at

The fuse probably is internal. It may be necessary to remove your OTR microwave to get access inside.

Jan 13, 2012 | Daewoo Microwave Ovens

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Won't heat food on any setting. Could it be a fuse? Where would it be located? Don't have a manual.

Fuse will be inside the oven.And with replacing fuse ,you need to check the cause of blowing the fuse.Check the capacitor and transformer (physically).If they look deformed .Then change it followed by the fuse.
Please rate my work

Sep 17, 2011 | Daewoo KOR-630A Microwave Oven

1 Answer

Panasonic NN-S540BF where is the fuse?

There will of course be a fuse in the plug, but also there will be a fast-blow specialist glass fuse inside the machine, mounted on or around the transformer. You will have to take the cover off the microwave and expose its innards to find this.

Food for thought:

This is supposed to be a professional operation not to be taken on by unqualified people

If you ARE going to do it, unplug from the mains before you start!

Take the fuse to your local electrical shop, you wont get one of these fuses from a supermarket

Ask yourself why it blew? There is a tiny chance it was a coinidental mains power surge. Far more likely that it blew because it needed to, because the tarnsformer has become faulty.

If you replace the fuse, be prepared for a 50/50 chance that it will just blow the new fuse straight away because it has an electrical fault (That you will not be able to repair, believe me!)

Finally, if you take a microwave apart, you should have it safety checked for leaking microwave energy after.

This is one of those "you shouldn't really do this yourself, but lots of people do" warnings. Proceed at your own risk.

Jun 23, 2011 | Microwave Ovens

2 Answers

The food in the microwave is not heating up I have tested the fuse (F8AH250V) and found that it has blown. Is it safe to replace this fuse (F8AH250V) on my microwave.

Fuses seldom just go bad on their own, but it's safe to replace. Before you replace the fuse, squeeze the tabs of the fuse holder clips together a bit. Sometimes they don't grip the fuse tightly enough, and this can cause heating which damages the fuse. If the fuse blows again there is a bad part in the oven that will need to be located and replaced. For a small countertop oven, it's probably more economical just to replace the oven than to repair it.

Jan 02, 2011 | Sharp Microwave Oven Microwave Oven

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Panasonic Microwave has no power

There is a 125V, 20 AMP line fuse inside the microwave. Its usually mounted on a small input line filter board at the point where the power cord enters the back of the unit. You will need to UNPLUG the microwave oven and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. has some excellent exploded view parts illstrations you can use to assist you in component location and assembly.

If the model number is correct, the fuse is listed as item 55 in this parts illustration:

There are also a couple of thermal cut-outs listed as items 51 and 52. These can affect the operation of the oven as well, but usually are related to overheating something in the oven cavity. If you haven't overheated the oven cavity recently, its probably the line fuse. (Popcorn and Potatoes are notorious for causing overheat problems).

You can purchase repacement fuses for appliances at any hardware store. Just make sure the rating is the same as manufacturer installed fuse. You need to purchase a 125V, 20AMP, slow blow for best results.

To answer your question about the fuse blowing when the unit is not in use...Yes, this does occur. You may have experienced a minor power fluctuation such as a brown out over the night that could have caused the fuse to blow. Some components are more sensistive to variations in current than others.

Another possibility that I have to mention is roaches. This does not in any way insinuate you live in filthy conditons, or have an infestation. I just need to mention that insects (such as roaches) are attracted to electronics. Especially, where there may be food. Since their body composition is mostly made up of water, if they crawl across an electrical component, they could cause a short circuit and blow a fuse.

If you have any questions, or need assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit.

Apr 18, 2010 | Panasonic NN-P295SF Microwave Oven

1 Answer

NE1856 Microwave

error 81 message is usually a fault in a relay....found on the LV transformer located beneath the noise filter....(noise filter is a ciarcuit board mounted to one side, should see 2x 10a fuses on it and a small 1.25A)...underneath, a circuit board...thats the lv transformer assy.
Check the 10A fuses first....if they are ok, change the entire transfromer assy.....easy enough to do, the part number is A692M3310GP

Hope this helps

Oct 05, 2008 | Panasonic NN-2505A Microwave Oven

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