The Defrost Control Board is an OEM part for Whirlpool refrigerators. This board manages the defrost cycle by controlling the defrost heater and monitoring the freezer's temperature.  Causes of a bad defrost control board can include electrical issues, wear from continuous use, or damage from power surges.   Symptoms of a bad defrost control board include: Excessive frost buildup in the freezer compartment The refrigerator not cooling properly The defrost heater not activating The refrigerator running continuously without cycling off This OEM Whirlpool part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper and some Kenmore models.4388931 (AP3109393) replaces 2154674, 2162270, 2162373, 2169266, 2169268, 2188160, 2303825, 901240, AH372260, EA372260, PS372260.