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

This evaporator defrost heater melts frost and ice buildup on the evaporator coils so the refrigerator can maintain proper cooling. It replaces a failed heater to restore normal defrost operation and help prevent over-icing. What it does:

• Heats the evaporator coil during the defrost cycle to melt accumulated frost and ice
• Helps restore normal airflow and cooling when frost is blocking the coil
• Commonly associated with symptoms like excessive frost buildup, reduced cooling, or the freezer running constantly
• Works with the appliance's defrost controls (thermostat/timer/board) to operate only during defrost cycles

• Disconnect power to the appliance before starting any repairs
• Access typically requires removing the evaporator cover inside the freezer compartment
• Handle the heater and evaporator fins carefully to avoid damage; replace mounting clips or insulation as needed
• Test or inspect related defrost components (thermostat/thermal fuse/board) for a complete repair