Whirlpool Refrigerator Defrost Heater Assembly Replacement

Whirlpool Refrigerator Defrost Heater Assembly Replacement — What This Part Does

The defrost heater assembly sits under or around the evaporator coil and melts frost during automatic defrost cycles. When the defrost timer or control board calls for defrost, the heater warms the coil enough to melt accumulated frost so air can flow freely through the evaporator. Over time the heater element can burn out and open, leaving frost to build into a solid ice blanket that blocks airflow and stops the refrigerator from cooling correctly.

Whirlpool heater assemblies are model-specific, so the exact part number depends on your refrigerator model. Failed heater wiring, loose connectors, or a bad defrost thermostat or thermistor can also prevent the heater from working, which is why technicians check continuity on the heater element and verify the rest of the defrost circuit before ordering a replacement.

Jump to Replacement Steps

Signs It Needs Replacing

• Heavy frost or solid ice on the evaporator coil You remove the evaporator cover and see a thick layer of frost or a complete ice blanket covering the coil.
• Poor cooling in fresh food or freezer The refrigerator runs constantly but temperatures climb because ice blocks airflow from the evaporator.
• Warm freezer with frost buildup The freezer stays warmer than set and you see frost accumulating around the back wall or evaporator area.
• Visible damage or burned spots on the heater The heater tubing shows cracks, broken wire leads, or burned sections when you inspect the evaporator compartment.
• Open continuity reading on the heater element A multimeter shows infinite resistance across the heater terminals, meaning the element has failed open.
• Ice bin or shelves frosting over Frost migrates forward into the freezer storage area because the evaporator cannot defrost and airflow is restricted.

How to Replace It

1. Unplug the refrigerator from the wall outlet.
2. Remove freezer shelves, drawers, and the ice bucket to access the rear freezer wall.
3. Remove screws securing the evaporator cover and lift the cover off to expose the evaporator coil and heater assembly.
4. Locate the defrost heater (usually a metal or glass tube mounted under or around the evaporator coil) and disconnect the wiring connector or wire terminals.
5. Release the heater from its mounting clips or brackets and carefully pull it out from under the evaporator coil.
6. Route the new heater assembly in the same position as the original, snap it into the clips or brackets, and reconnect the wiring harness.
7. Reinstall the evaporator cover, shelves, drawers, and ice bucket in reverse order.
8. Plug the refrigerator back in and verify normal cooling and defrost operation over the next 24 hours.

The Part You Need

Related Error Codes

If this part is failing you may also see one of these codes:

• Whirlpool Refrigerator Df error code
• Whirlpool Refrigerator E0 error code
• Whirlpool Refrigerator E1 error code
• Whirlpool Refrigerator E2 error code
• Whirlpool Refrigerator E3 error code
• Whirlpool Refrigerator E4 error code
• Whirlpool Refrigerator E5 error code
• Whirlpool Refrigerator E6 error code
• Whirlpool Refrigerator E9 error code
• Whirlpool Refrigerator Po error code

When to Call a Pro

Call a technician if you find the heater element tests good with a meter but frost still accumulates, because the real problem may be a failed defrost thermostat, thermistor, control board, or timer. Also call if you are uncomfortable working inside the freezer compartment or if the evaporator coil itself appears damaged or leaking refrigerant. A pro can diagnose the entire defrost circuit, check for sealed-system leaks, and install the correct model-specific heater assembly with all brackets and wiring in the factory configuration.