GE RVM120H Use And Care Manual page 21

All these things are normal
with your microwave oven:
Steam or vapor escaping from
Light reflection around door or
. Dull, thumping sound while oven
is operating.
. Dimming oven light and change
in blower sound may occur while
operating at power levels other
than high.
. 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.
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