Question about GE Spacemaker JVM1640SJ Microwave Oven

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FUSE on Microwave still blows

Below is the history of my recent posts. I haven't heard back from my 16 Dec post yet. Can you help? Also, can you recommend a good place online to puchase parts? In researching your website showing other microwave models with similar problems, I see that my problem might be a HV transformer or capacitor. If so, is there a way to test those items on the microwave to see if they are faulty? posted by DITY Pete on Dec 11, 2007 Report abuse

About 2 months ago, you suggested I replace the monitor switch on my microwave because the unit came on when I opened the door. This fixed the problem and it has been running great since then. Just yesterday, everything stopped working, as if I unplugged the unit. I checked the house CB and the outlet for power...both OK. Is there an internal fuse that might be giving me a problem?
Comment by DITY Pete, posted on Dec 16, 2007 I replaced the ceramic fuse with an exact type (20A 250V). When I truned the microwave on, on my bench, the fuse blew again as soon as the microwave kicked in and began to draw heavy power. I tried a second fuse thinking it might have been a bad fuse, but I had the same results. Any ideas?

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Re: FUSE on Microwave still blows

Sounds like a power supply problem. There is a capacitor in the unit which often gives problems. This may be beyond non-professional help and may have been started when you had the other failure.

Posted on Dec 20, 2007

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Does this unit itself have fuses inside it? If so, how do I access them.

Shelia, A lot of microwaves do have internal fuses, Links below will show how to change them.
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What are its demensions

Thank you for your post, kevin l beeney!

I understand you need dimensions for your Frigidaire microwave, FMV156DC. I have located information on your microwave showing the width is 29 15/16 inches, depth is 15 9/16 inches, and height is 16 ¼ inches. I hope this information is helpful. -Matt

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Why does fuse keeps blowing within mircrowave

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Based off the information you have provided I understand that your fuse blows every time your Electrolux microwave starts up. It sounds like it could be an issue within the control panel, capacitor, or circuit breaker. Because it could be a number of any one of several underlying causes, I would personally contact a professional to accurately diagnose your microwave to determine the root cause to reduce the risk of unnecessary parts-Matt

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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.

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Yesterday, my sharp carousel r-1460 went dead. I took apart the front keypad and replaced the 20amp fuse behind it. the microwave light and fan work.But, when I start microwave to cook something, pop! fuse...

If the 20A fuse is blowing, it is often the high voltage transformer or magnetron. If this is the case, and the microwave is not under warranty, replace it. Residential microwaves are generally considered disposable. Parts and labor are just too expensive. A magntron or transformer can cost more that half the cost of a new microwave.

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Whirpool convection microwave not heating properly MH6150XMS

Be sure when testing these switches that they are not 'in circuit' to get a valid reading. If the monitor switch does not open when the door is closed, it should blow the fuse when the cook circuit is energized. If the secondary interlock switch does not close to zero ohms, it won't complete the circuit correctly.

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1 Answer

Microwave oven problem

A fuse blows most often because of an excess of current due to a failed (or failing) component (high voltage cap, transformer, or door interlock switch) or a surge; or due to overheating of the fuse caused by a fuse holder that is too loose.

If replacing the fuse fixes it, then it may have been a fluke surge.

But don't be surprised if it blows again. If so, I would refer you back to my previous solution post here:

Or feel free to post back with details. Good luck!
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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2 Answers

Fuse keep blowing up

You have a short in the system. removeing the fuse was not a good thing to do. The fuse in a microwave helps keep the system from an overload which can and I have seen this blow-up. The micro pump inside might have a dead short it,

Aug 30, 2006 | Whirlpool MH7130XE Microwave Oven

1 Answer


Agrivated, looks like the fuse 18amp is in the back on top. You will have to remove the shell off the microwave to get at it. This one operates with a have some high voltage there. Make sure it's unplugged. While you have it apart, check the primary switch, top one on door latch. If the monitor switch finds this closed when the door is opened it will blow that fuse. You also have a cavity thermal cut out that will shut the oven down. back.

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