The GE JVM1440 microwave went from working fine to suddenly running very, very slowly and hardly making any noise. Thought it wasn't heating, but heats to extreme temperature in seconds. Purchased (new) 6 mo. ago.
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Its your Magnatron tube, thats what makes the microwaves and heats the food. The part will cost you more than a new micro. The new model that replaced yours is a JVM1540 and you can get them for 179.00
IT COULD BE A NUMBER OF THINGS RANGING FROM DIODES TO CAPACITORS TO YOUR MAGNATRON OR THERMOSTAST OR TRANSFORMERS. IT'S DIFFICULT TO DIAGNOSE WITHOUT SEEING THIS MICROWAVE. YOU MAY BE BETTER OFF GETTING YOURSELF A DIFFERENT ONE.
The second problem is probably defective door switches, or it may be a problem with the control panel, which we repair nationwide for only $32.50.
On my Web site, I have info on safety, disassembly, and diagnosing and replacing door switches: http://tinyurl.com/yzjozk
Running it empty has damaged the magnetron. It will work for a while, but it will eventually have to be replaced. A good parts source is here: http://tinyurl.com/gv383
Word has it that many of these models have a defect which causes the microwave energy to be reflected back to the magnetron, causing damage to the magnetron, and eventually damaging the high-voltage diode too.
Also, the fuse or the magnetron theral cutout / thermostat can eventually blow, too.
There is a replacement magnetron and stirrer kit available.
I would definitely call the GE Answer Center at 800-626-2005 about this. It's not considered a recall, but a "campaign".
They may pick up part of the cost. It's not cheap.