Question about Microwave Ovens

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As i turn on microwave it blows the fuse. what could be the reason.

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When microwaves are old they have that always it blows the fuse,dont run to many things at once,check if your switch is working right and ground connected,and lost will be put a bigger breaker at the fuse box to handle more power,if mic is old change to new style will change the problem right away.if my info was of any help to you please leave a comment,vote,note.thankyou

Posted on Sep 10, 2009

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Try using it at a different location in the house(different circuit) if it also blows that fuse, there must be a short in the unit. do not use. if it works means line in the kitchen is overload, and you need a higher fuse rating or breaker.

Posted on Sep 10, 2009

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tiway1
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SOURCE: Makes a loud humming sound and blows fuse behind controll panel

Most likely a shorted capacitor is causing the fuse to blow. Easy and cheap to fix.
Check with www.martinmicrowave.com or call toll free 1-877-894-0035 for parts info

Posted on Sep 06, 2008

MicrowaveSvc
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SOURCE: Turn on microwave and it blows the fuse.

This is almost certainly a shorted high voltage capacitor, part # RC-QZB018MRE0 (zeroes, not "ohs").

We have the service / repair manual for this model and have uploaded it to our site here to help you.

It will give you safety info, step by step help in disassembly, troubleshooting tips, and part numbers.

Most computers will open this document automatically, but you may need the free Adobe Reader.

You can order parts from Encompass here or you can call them toll-free at 866-779-5835.

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

Posted on Jun 30, 2009

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Related Questions:

1 Answer

What is the reason for high voltage fuse to blow outon microwave.


The only reason for any fuse to "blow" open is a direct short. The most common reason, in a microwave oven, is the Magnetron. This is the device that generates the microwaves. If this is the case, repair is not very economical.
If you have a volt meter or a device that can check for resistance, check for anything that is shorted or "0" Ohms to ground.
I hope that his helps answer your question.
If you have any further questions please feel free to ask.

Mar 01, 2015 | Microwave Ovens

1 Answer

The microwave unit in my Thermodore CMT231 has abruptly stopped working. I suspect a fuse may have blown. Is this self-serviceable? I am pretty much a novice.


When you say it stopped working , you mean no lights or display etc. Then that can be a fuse but fuses blow for a reason. Find the reason if the fuse blew.

Oct 14, 2013 | LG LMV1650ST Microwave Oven

1 Answer

Whirlpool microwave fuse has blown multiple times


It depends on which fuse and when it blows. Wish you had mentioned that.

But usually it's a defective door switch or door switch mount.

If the fuse blows at random times while it's cooking, it may just be a loose fuse holder. Those have to be replaced due to metal fatigue, not just squeezed tight with pliers.

If it blows as soon as you hit "Start" to begin cooking, you have a shorting high voltage capacitor.

If it blows when you open or close the door, you have a loose or defective door switch or latch.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

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

Nov 21, 2012 | Microwave Ovens

1 Answer

When I turn on microwave oven fuse is burn out right a way. Thank you


Fuses burn for a reason: because the circuit is being overloaded. There could be several causes, first determine what else goes off when the fuse blows. All of the things that go off when the fuse is removed/blown/burnt are on the same circuit. A microwave is a heavy load, somewhere between 750 watts and 2000 watts, depending on the microwave. Remove other heavy loads (items which use lots of power) from the circuit. A 15 amp 120 volt circuit in a residence is good for 1800 watts (or 1440 watts continuously). If you had a 1500 watt microwave and four 100 watt light bulbs on the same circuit, you would be overloading the circuit. With a microwave, it is best to have it on its own circuit with nothing else (if possible). The fuse may also blow or burn in this situation if there is a problem with the microwave.

Oct 05, 2011 | Microwave Ovens

1 Answer

Fuse size for sharp mircowave r 520ks


The fuse will be a 20amp ceramic. The fuse should be available at hardware stores, Radio Shack.
If the fuse is blown, there is a very good chance you have another problem, possibly a bad or misaligned door switch, shorted capacitor. Replace the fuse, if it blows again you will have to figure out why. Door switches are the most common reason for the fuse to blow.

Feb 02, 2011 | Sharp R-520KS Microwave Oven

2 Answers

I have a panasonic nw -h665 Microwave. 3 months old. It just does nothing. Fuse Maybe Blown? and where is it ?


3 Months old? Under warranty surely. Just call Panasonic Repair Service for a free repair.

There are fuses in there but they don't fail for no reason.

Jan 14, 2011 | Microwave Ovens

1 Answer

Microwave turns on everything works but is not heating up food what can I do, I am a license electrician is there a fuse in side?


Yes if you remove panel you will find a capsule with a ceramic fuse inside so you can check it out.
Many times the fuse blown out from long time use, however if it will blow out you need to check what was the reason for bowing the fuse.

Sep 28, 2010 | GE XL1800 1100 Watts Microwave Oven

1 Answer

Unit dead Unit is dead - suspect blown fuse


Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it.

The reason for this is that if you do not have any experience and training with microwaves, you can get a SEVERE shock, even if the oven is unplugged. THAT being said, if you still want to know where the fuse is get back to me. good luck.

ALSO, as you may know, a small microwave these days is under fifty bucks at walmart.

May 20, 2009 | Sharp R-1880LS 850 Watts Microwave Oven

1 Answer

Ge XL spacesaver Microwave blowing fuses


I had the same problem.
Took it in to the local repair guy and he found the transformer was blown.
Cost $120 including tax

Jan 15, 2009 | GE JVM1630 Microwave Oven

1 Answer

Makes a loud humming sound and blows fuse behind controll panel


Most likely a shorted capacitor is causing the fuse to blow. Easy and cheap to fix.
Check with www.martinmicrowave.com or call toll free 1-877-894-0035 for parts info

Sep 02, 2008 | Sharp R-1460 Microwave Oven

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