GE JE1860 Owner's Manual page 34

Before you call for service...
Things That Are Normal With Your Microwave Oven
34
I Steam or vapor escaping from around the door.
I Light reflection around door or outer case.
I Dimming oven light and change in the blower sound at power
levels other than high.
I Dull thumping sound while oven is operating.
I TV/radio interference might be noticed while using the
microwave. Similar to the interference caused by other small
appliances, it does not indicate a problem with the microwave.
Plug the microwave into a different electrical circuit, move the
radio or TV as far away from the microwave as possible or check
the position and signal of the TV/radio antenna.