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Brand:
Model Number:FGMC2766UFC
Main Symptom: microwave quit working, replaced fuse and works, however, when pluged into over it doesn’t work but if plugged into wall it works. what’s wrong?
What happens & when:
Error Code (if any):
Parts or tests already tried:
Photos / video link:
That test actually narrows this down quite a bit. On the FGMC2766UFC, the microwave has its own three-prong power cord that plugs into a receptacle built into the wall-oven section.
Since the microwave works normally when plugged directly into a known-good wall outlet, I would not suspect the microwave itself right now. The problem is much more likely that the oven’s microwave receptacle is not supplying the proper 120 VAC.
With the microwave unplugged from the oven receptacle, carefully meter that receptacle:
If you have 0 VAC or an incorrect reading, trace the power supply to that receptacle. Look for a loose/burned connector, damaged wiring, or a failed connection/component feeding the microwave receptacle.
I’d also inspect the receptacle itself closely. A burned or loose terminal can sometimes show voltage with no load but lose power as soon as the microwave is plugged in.
One additional check: measure Hot → Neutral while the microwave is plugged in and attempting to operate. If you have approximately 120 VAC unloaded but the voltage drops significantly under load, you almost certainly have a high-resistance/loose connection in the oven’s microwave power-supply circuit.
Since the replacement microwave fuse holds and the microwave operates from a wall outlet, I would diagnose the oven-side 120-V supply before replacing any more microwave parts. Frigidaire also recommends verifying incoming power first on a no-power microwave complaint.
Live Power Warning: These voltage tests require working around energized wiring. If you’re not comfortable testing live voltage, have a qualified technician perform this portion.