Question about GE Microwave Ovens

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Microwave oven went dark. Electrical power supply to outlet OK. Is it possible that the magnetron tube is at fault? Where do I go in the central New Jersey area to get service? The microwave oven is just two years old.

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  • ecywinski2 Aug 19, 2008

    Opened up the unit, and found the fuse, replaced same, now functions normally. Thanks for the e-mail.

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  • GE Master
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It may be possible that the magnetron overheated and its thermal cutout or thermostat tripped.

A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

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

Posted on Aug 18, 2008

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Good Afternoon Friend, that's a great question!

Depending on the model of your Frigidaire microwave, the fuses are typically on located behind the control console, on the magnetron or on the oven capacity. However, if your microwave does not heat, you may possibly have a faulty control panel, magnetron, or experiencing an issue with the power supply. Please confirm that your microwave is plug into its own outlet and that you are not using a GFI outlet. Hope this helps! - Z

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My 2055 went completely powerless


If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if contact is not through the microwave will not work.

Now keeping clear of the microwave, switch on, use a cup of water inside to test.
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I was microwaving something, the microwave began making a very strange humming/buzzing sound. I turned it off, restarted it and it once again made the noise. This time when I shut it off (by opening the...


I suspect there are two things wrong with the oven.

First, the humming noise was probably due to a bad magnetron tube. The magnetron is the microwave source, and when they fail they often cause the oven to make that odd sound. It's because of the load the bad tube puts on the power supply. There are a couple of other parts that can cause similar problems when they fail, but the magnetron is the most common.

The second problem is that now the oven has a blown fuse because you opened the door while the oven was running. There is a switch inside the oven, operated by one of the door latches, which is wired so the fuse will blow if you try to run the oven with the door open. I suspect it did its job in this case.

The fuse can be replaced, as can the magnetron. However, the magnetron is the most expensive part of the oven and it may be more economical to replace the oven than to repair it. Microwave oven repairs, especially a magnetron replacement, should be left to a professional because of safety concerns. Between the part cost and labor, it may only cost a little more to buy a new oven. I don't know how old your oven is, but check your owner's manual for warranty information. Maybe you'll be lucky and find the part cost is covered, even though you'll probably have to pay the labor. If the oven is more than two or three years old, though, it's unlikely there's any warranty left.

If you want to keep this oven, let a qualified servicer check it and give you an estimate for the repair. Or look around for an after-Christmas sale and treat yourself to a new oven.

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Microwave power just stopped


if the lights and turn table still work, then its either your h.v. diode,h.v. capacitor or the magnetron tube at fault, if nothing operates then its the internal ceramic fuse under tho outer unit cover thats bad or your outlet is dead at the wall

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one of 3 things, for sure the internal fuse is gone, then check for a: bad Hi-Voltage;diode, Hi-Voltage capacitor, or the magnetron tube is defective,none are too hard to change out,but the magnetron is fairly expensive to replace:

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Check the power outlet with a lamp. If ok, check inside the case for a blown fuse. If so, there is probably a short in either the magnetron high-voltage supply (a shorted HV diode or possibly a shorted stirrer bearing--a fan-like device with a plastic bearing that is located within the waveguide that delivers energy from the magnetron to the cooking cavity.

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Sounds like the magnetron has failed. This is the component that produces the microwave that heats the food. The cost of the magnetron is about 95% of the cost of a microwave . Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing. There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.

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Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.

The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


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I complement you on an exemplary report!
The drooping line voltage seems a little more than desired and you might want to try it on a different outlet, but doubtful the real problem. Microwave ovens are about the heavyist load that standard house wiring sees.
More likely the magnatron is just going bad especially if the fan hasn't been working and it has been running hot.
By the way, how old is it?
They are not too hard to replace yourself. Look on EBAY for "universal magnatron"
Hope Ya Fix it!

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