Whirlpool WP4387490 Bimetal Defrost Thermostat for Refrigerator

The WP4387490 Whirlpool Refrigerator Bimetal Defrost Thermostat is a component that regulates the defrost cycle within refrigerator. It is situated in freezer compartment and functions as a temperature-sensitive switch. When frost reaches a certain level on the evaporator coils, the bimetal defrost thermostat activates. This action interrupts the cooling cycle and triggers the defrost heater to operate. The heater then melts the accumulated frost, which helps maintain the refrigerator's efficiency. Once the temperature returns to a designated level, the bimetal defrost thermostat resets, allowing the refrigerator to continue its normal cooling processes. The WP4387490 Bimetal Defrost Thermostat helps manage frost buildup that could otherwise interfere with the appliance's operation and energy use.