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The WHIRLPOOL wp3-80405-003 is a defrost heater replacement part designed for use in refrigeration appliances. The defrost heater cycles on periodically to melt frost buildup from the evaporator coil, allowing the unit to maintain proper airflow and cooling efficiency. Without a functioning defrost heater, ice accumulation on the evaporator restricts airflow and causes cooling failure. This is an OEM-specification replacement intended for installation by appliance service technicians handling refrigerator defrost system repairs.
This defrost heater is suited for residential refrigerator applications where the original heater element has failed or shows signs of open-circuit failure. It is used in the automatic defrost system, typically located behind the rear panel of the freezer compartment. Technicians replace this component when diagnosing defrost system faults such as excessive frost buildup, warm freezer temperatures, or a defrost system that fails to initiate.
Designed as an OEM-style replacement defrost heater for compatible residential refrigerator models. Verify fitment against the appliance model number before installation.
Installation should be performed by a qualified appliance service technician. Disconnect power to the refrigerator at the outlet or circuit breaker before beginning any service work. The evaporator panel in the freezer compartment must be removed to access the defrost heater, and any remaining frost should be cleared before handling the component. Do not restore power until all panels are reinstalled and wiring connections are secure.
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