All These Things Are Normal With Your Microwave Oven
•Steam or vapor escaping from around the door.
•Light reflection around door or outer case.
•Dimming oven light and change in blower sound may occur while operating at power levels other than high.
•Dull thumping sound while oven is operating.
•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 microwave. If you notice this interference, check that the microwave oven is on a different electrical circuit, relocate the radio or TV as far away from the microwave as possible, or check the position and signal of the receiving antenna.