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

This defrost heater warms the evaporator during automatic defrost to melt built-up frost so air can move freely and temperatures stay consistent. Replace a failed heater to restore normal cooling and end recurring frost on the freezer panel.

• Melts ice from the evaporator coil during the defrost cycle
• Prevents frost buildup that restricts airflow and causes warm spots
• Helps maintain stable refrigerator and freezer temperatures
• Typical failure signs: heavy frost on the back wall, reduced cooling, fan noise from ice contact, frequent manual defrosting

• Disconnect power before servicing; wear cut-resistant gloves
• Access through the freezer compartment; remove shelves/ice bin and rear panel to reach the evaporator
• Match wire connections and route leads exactly as original; keep wiring clear of the fan and sharp edges
• After reassembly, restore power and monitor a defrost cycle; if frost quickly returns, also evaluate the defrost thermostat and control