The GE defrost control board is an OEM replacement part responsible for regulating the automatic defrost cycle in a refrigerator. This part is typically situated within the appliance's control housing or on the back of the appliance. The defrost control board manages the timing and duration of the defrost cycle, ensuring that frost and ice buildup on the evaporator coils are periodically melted away. This prevents excessive frost accumulation, which can hinder the refrigerator's cooling efficiency and airflow. By controlling the defrost cycle, the board helps maintain consistent temperature levels inside the refrigerator. This GE part can also be used on Hotpoint, RCA, and Kenmore/Sears appliances. This part fixes the following symptoms A noticeable increase in frost or ice buildup on the evaporator coils. The refrigerator or freezer section not cooling properly. Frequent or extended compressor run times. Audible clicking or buzzing sounds coming from the control panel area.WR55X21623 (AP5957867) replaces WR55X11211, WR55X21128, 4324938, PS10065388, WR55X10397, WR55X10744, WR55X10900.