Whirlpool Refrigerator Defrost Heater Assembly WP12729123, Replaces 12729123

Genuine Whirlpool refrigerator defrost heater assembly. The heater melts frost accumulated on the evaporator coils during the refrigerator defrost cycle.

Is This the Right Part?

✅ Cross Reference Information

Common Symptoms

• Visible frost or ice accumulation behind the freezer’s interior access panel
• Reduced airflow from the freezer evaporator area
• Fresh-food compartment temperature above normal despite the freezer continuing to cool
• Recurring frost buildup after manual defrosting

Check Before Replacing

• With the refrigerator unplugged, inspect the evaporator area for excessive frost or ice that could indicate a defrost-system problem.
• Visually inspect the heater, wiring, connectors, retaining clips, and nearby harness routing for damage, looseness, or signs of overheating.
• If the model’s service documentation provides a defrost-heater diagnostic test, use that model-specific test rather than applying power directly to the heater.
• A qualified technician can test heater-circuit continuity and control voltage according to the refrigerator’s service documentation; an open heater circuit does not by itself rule out a problem with the thermostat, thermistor, wiring, or control.

Pro Tip

Part Details

Key Features

• Genuine Whirlpool OEM defrost heater assembly
• Designed for use in the refrigerator evaporator defrost system
• Heater assembly includes the component and associated mounting/wiring features shown for the exact application
• Archived documentation identifies WP12729123 as replacing previous number 12729123

Installation Notes

• Unplug the refrigerator before accessing or replacing the heater.
• Access requires removal of the freezer interior components and evaporator access panel on documented applications.
• Avoid bending, puncturing, or stressing refrigerant tubing when moving the evaporator assembly.
• Disconnect and reconnect the heater wire connectors and retaining clips carefully, and route the wires and grommets as originally installed.
• Reinstall the evaporator assembly, access panel, sensor cover, drawer rails, drawer, and bin securely before restoring power.

Verified Compatible Models

GI6FDRXXB03, GI7FVCXWY00, JFC2089BEP00, JFC2290RTB00, JFI2089WES8, JFX2597AEP0, KRFC302ESS03, KRFC400ESS00, KRFF305ESS03, MFI2570FEZ05, MFT2771XEW0, MFX2570AEM5, WRF535SMBB00, WRF540CWHB00, WRF540CWHZ03

Fitment reminder: Match the complete appliance model number, including suffix or revision where applicable, before ordering.