Spacesaver 1800XL Screeching or Grinding Noise

dont use the microwave until you retrieve what dropped inside when you removed the port. The grinding is most likely a foreign object that is hitting the moving parts of the microwave and causing sparking. It can catch fire

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101
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hello Frank. Sorry to tell you that the magnetron is going bad and making that terrible noise. Since the inside of a microwave, even unplugged has up to 2000 residual and deadly volts of electricity I recommend either calling a pro or replacing the unit.

More than likely the rollers under the glass tray have build up on them. simply remove tray and rollers and clean rollers with soap and water.Before installing clean track area that rollers set in and should run smooth after that. If this doesn't do it then reply with more info about it < does tray move in a jerking motion?, does unit have circular cover in the top? in right upper corner there is perferated metal,is it discolored?> should be able to figure it out if it isn't rollers.

Hi jnflanders,
You've probably solved this by now, but I'll answer just in case. That part is called the stirrer motor. You can replace it yourself, as long as you have an offset phillip's head screwdriver handy.
Before you order the replacement part, figure out if your stirrer is driven by a d-shaped or a square shaft. You can tell by taking off the round plate on the inside top wall of the microwave. GE makes stirrer motors for both d-shaped and square shafts, so you'll have to get the right one. Here's the d-shaped motor that fixed this problem with my microwave: http://www.appliancepartspros.com/part_details.aspx?part_id=2024961.
Good luck!

Many thanks to e3enigma above! I removed the synch motor under the turntable; all other microwave functions work fine and the grinding noise is gone, hooray! A trip to the appliance parts store tomorrow for a replacement synchronous motor and all should be well. Thanks again!

sounds to me like the magnatron stopped working.

The motor that is running the turntable may be going bad.

This sounds like the stirrer. If it sticks or stops, the microwaves can damage or destroy it. You may have a bad stirrer or magnetron. There is an important bulletin that covers these problems. To see if yours is covered, see: http://207.234.249.73/mwd/ge_mw_mag_kit_bulletin.pdf If you need more help, please follow-up.