GE PVM9215SKSS Owner's Manual page 18

About the sensor microwave features.
Covered
Vented
Dry off dishes so they don't
mislead the sensor.
18
Humidity Sensor
What happens when using the Sensor Features:
The Sensor Features detect the increasing humidity released during cooking. The oven
automatically adjusts the cooking time to various types and amounts of food.
severely overcooked or burnt food. If food is undercooked after the countdown, use COOK TIME
for additional cooking time.
The proper containers and covers are essential for best sensor cooking.
Always use microwave-safe containers and cover them with lids or vented plastic wrap. Never
overcook.
Be sure the outside of the cooking containers and the inside of the microwave oven are dry
before placing food in the oven. Beads of moisture turning into steam can mislead the sensor.