Customer Questions and Answers for Refrigerator Air Damper by Whirlpool

John, there are a few things that could occur to cause this. If there has been a temperature issue or a hot item was placed in the unit, then the moisture could accumulate in the damper and potentially freeze up. You may want to check to ensure that there are no obstructions like this in the damper. Another thing that can cause an issue is if there was a power flicker. If power cuts off and on multiple times, this can impact any component especially if it is in operation during the power fluctuation. Inspection of the damper would be recommended to see if it is a mechanical failure or if there is a possible obstruction.