Customer Questions and Answers for Radiant Defrost Heater (Evaporator) by Whirlpool

This radiant defrost heater melts frost on the evaporator to restore proper airflow and cooling. Replacing a failed heater helps prevent frost buildup that can reduce cooling performance and cause extended run times. What it does:

• Heats the evaporator during defrost cycles to melt accumulated ice.
• Restores normal airflow and cooling by preventing excessive frost formation.
• Commonly used when frost builds on the evaporator, the freezer struggles to maintain temperature, or the defrost system fails.
• Works with the existing defrost thermostat and control to complete the defrost cycle.

• Disconnect power to the appliance before starting any repair to avoid shock or injury.
• Removing the evaporator cover may be required; follow the OEM service manual for your model.
• Inspect and test the defrost thermostat and wiring while replacing the heater.