Question about GE JVM1870 Microwave Oven

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Sudden power loss

It will not work for more then 2/3 min. The power will cut off and after while the power will be back by itself

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  • 9,098 Answers

Is the internal cooling fan running? (I don't mean the hood vent exhaust fan)

It sounds like your magnetron is overheating, tripping the magnetron thermostat, which protects your magnetron from overheating to the point of destruction.

It may be because the internal cooling fan is bad or the magnetron is just failing.

(Do you hear the cooling fan running behind the control panel when you microwave?)

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.

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

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.

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

Posted on Sep 16, 2008

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Posted on Jan 02, 2017

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The unit has a fuse in the power board, but when the fuse is gone it does not even start up. If it starts it is not the fuse.

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Will I have ruined the microwave if I forgot to put the food in the oven and made it cut out?


Its possible you could have burnt it out. You also may have blown the fuse which should be inside the cabinet. Before you do anything get a container of water and try to heat it and see if the machine works.
The microwave may have to reset itself. If it appears to work I would use it. If it shuts itself off then you have a problem but its probably cheaper to get a new one than to repair.

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My sharp R409Y*A microwave overheats after 4 min every time and shuts itself off for a few min. It will turn itself back on, but if I use it right away, it will shut itself off again quicker.


I would say your cooling ran is not running, or your vent holes are blocked, or (if equipped) a filter is blocked.

Without the cooling fan, the magnetron overheats and its TCO (thermostat) shuts down all power to the oven until it cools back down to a safe temperature, then power is restored.

Feel free to e-Mail me at pupista@gmail.com if you need more free advice.

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It's possible that the unit is overheating, and shutting itself down to make sure that it doesn't melt or burn. Do you have it against a wall, or in a cabinet where the unit cannot vent? Is there a fan? Is it working? --j.

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