GE PT970SMSS Owner's Manual page 8

IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING.
ALL THESE THINGS ARE NORMAL WITH YOUR MICROWAVE
s
Steam or vapor escaping from around
the door.
s
Light reflection around the door or the
outer case.
s
Dimming of the oven light and change
in the blower sound may occur while
operating at power levels other than high.
s
The microwave fan may operate with both
ovens off. It is cooling the control and will
turn itself off.
8
s
Some TV-radio interference might be
noticed while using your microwave oven.
It's similar to the interference caused by
other small appliances and does not
indicate a problem with your oven.
s
A dull thumping sound while the oven
is operating.