Whirlpool 4388931 Refrigerator Defrost Timer

The Whirlpool 4388931 is a defrost control board, commonly known as a defrost timer, required for your refrigerator to function properly. This circuit board controls the automated defrost cycle in a manner similar to an internal clock. It instructs the refrigerator to alternate between cooling and defrosting times by cycling on and off. During defrosting, the timer activates the heating element to melt any frost on the evaporator coils, ensuring efficient cooling and eliminating ice buildup, which could obstruct airflow and limit performance. This defrost control board is compatible with a variety of refrigerator brands, including Whirlpool, Maytag, and KitchenAid. Replacing a faulty defrost timer will restore correct defrosting operation, eliminate frost buildup, and ensure peak refrigerator efficiency.