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

This evaporator defrost heater melts frost from the evaporator coil during the automatic defrost cycle to restore airflow and stable temperatures. Replacing a failed heater helps prevent ice buildup that restricts cooling and leads to warm spots. What it does:

• Heats the evaporator coil to clear frost/ice during defrost
• Helps maintain proper airflow between freezer and fresh food sections
• Typical symptoms: heavy frost on the back panel/evaporator, weak cooling or rising temperatures
• Also cause evaporator fan noise from ice contact and longer run times

• 1 evaporator defrost heater

• Disconnect power before servicing; allow any ice to thaw
• Access the heater behind the freezer's rear panel; avoid damaging fins or refrigerant lines
• Secure the heater and route wires exactly as original, keeping them clear of the fan and sharp edges
• Restore power and verify the defrost cycle per the service procedure