Question about Microwave Ovens

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I have a spacemaker and everything went out on it....no light no time no anything.....is there a fuse to check or anything?

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  • Microwave Ovens Master
  • 9,047 Answers

It's likely a blown fuse or TCO (aka thermal cutout / thermostat).
Yours should have a "mini-manual" (technical sheet) hidden either behind the grille or control panel. It's very helpful in locating and testing components.
There is a video here showing how to remove a typical over the range control panel assembly in under 5 minutes.
Accessing some components (especially the oven cavity thermostat) for testing and possible replacement will require you to remove the oven from the wall and take off the outer cover.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download GE owner's manuals and installation instructions here.
You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

Posted on May 04, 2013

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Posted on Jan 02, 2017

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I have GE Spacemaker microwave JVM1740DM 1CC. It suddenly stopped heating up. Everything else works fine and there is no loud noise or anything.


hello, the problem is that a fuse has blow up, the is a large fuse inside a white box, or sometimes without the box, see it carefully and you see that it says something like 5000 volts or 8000 volts or 5 kva, you will see that is burned, by a new one and put it. I have done it several times. good work, dont need to go to the repairman.

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Did you check the internal fuse? Often when everything is dark the fuse that protects the microwave is blown. Take the old fuse to your local hardware store and they will have a replacement for you. Should cost less than $5.

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HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

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Check the voltage at the primary winding of the highvoltage transformer. If it is 120 volt.then controll board part is. Now check the magnetron and related components. If the fuse and the diode are ok replace the magnetron

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Have you checked the fuse in the plug? Also there is an internal fuse that you have to remove the outer casing to get at. Please make sure the power is off and the plug is removed from wall socket before you start and do not power up until the casing is back on. Hope this helps.

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Hi, there are three issues that will cause a no heat situation in a microwave. these issue are a failed Magnetron, busted cut-off fuse and, failed diode.

I recommend checking all these area that are located inside the microwave for faults.

The most common issue will be a failed Magnetron.

The diode and, fuse will be located on the noise filter assembly.

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