I have a GE Spacemaker Microwave oven - range model.

This microwave suddenly started taking a very long time to heat anything. It barely warms the items up so it isn't normal. It also makes a sluggish type sound, almost as if the incoming voltage is low.

All other functions are working perfectly fine (turn table, lights, display screen, etc) but the heating component. The house circuit is functioning properly, as well as the exhaust fan speed; they seem to be normal.

Any ideas what could be wrong?

Thanks so much,

John