Just moved into a 3 year old house with an already installed microwave. About 2-3 seconds after wall mounted microwave begins heating, the power seems to decrease, overhead lights on the same circuit breaker dim and the there's sparking and popping noises in the microwave. Even the digital display is affected by the sparking with stray digits lighting up in concert with the sparking. The sparking is not as much as there would be with a piece of metal in the microwave, but it nonetheless troubling. Any thoughts?
GE had a rash of "underperforming" magnetrons on these units. They replace the magnetron, stirrer and high-voltage diode at no charge for parts as long as a GE-authorized service center does the work. Sometimes the unit gets run too long in a failing state and the waveguide and chassis of the oven get damaged. To see if yours is covered, see this bulletin: http://www.microwavedisplay.com/ge_mw_mag_kit_bulletin.pdf Otherwise, you need to contact GE Customer Relations at 1-800-386-1215 as soon as possible and tell them your problem and they will put you in touhc with a local authorized servicer.
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I have the same problem...but my GE Spacemaker model is a JVM 1440 mfg'd in March 2002. No problems with the digital display...just popping and flashing like it's about to explode.
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