Customer Questions and Answers for Refrigerator Air Damper Assembly by Whirlpool

Hello Antonio, This is normally caused by an air leak causing the humidity from the room temperature air to be circulated inside the unit. This humidity condenses in the damper and forms frost. Correct the air leak and the frost formation will cease. The only other things that can cause this is if the icemaker is connected to the hot water supply or if the mold heater on the icemaker is stuck in the "on" position, (or hot items being placed in the freezer).