OEM REPLACEMENT PART
WP12729127 Whirlpool Refrigerator Defrost Heater
Part# WP12729127
Fits Whirlpool
Fits KitchenAid
Fits Kenmore
Refrigerator Frosting Over or Not Cooling? Defrost Heater WP12729127 – Fix Frost Buildup Fast
If your Whirlpool refrigerator has excessive frost on the evaporator coils, warm temperatures in the fresh food section, or reduced airflow from the vents, a failed defrost heater is the most common cause. In Whirlpool-family frost-free refrigerators, the defrost heater cycles on periodically to melt frost off the evaporator coils — keeping airflow clear and temperatures stable. When it burns out, frost accumulates unchecked, blocking the evaporator fan and starving the fresh food compartment of cold air. ⚡ Common failure point in Whirlpool, KitchenAid, and Kenmore frost-free refrigerators. Part WP12729127 is the genuine OEM replacement heater that restores the automatic defrost cycle and normal cooling immediately.
❓ Is This the Right Part?
This is the correct fix if ALL of the following are true:
- ✔ Freezer section is cold but fresh food compartment is warm
- ✔ Evaporator coils are visibly frosted over or completely iced up
- ✔ Defrost thermostat and defrost timer/control board have been tested and are functional
- ✔ ONLY problem is heater element not energizing during the defrost cycle
Not sure? Send us your model number — we'll confirm before you order.
🔧 Common Symptoms
- Fresh food compartment warm while freezer stays cold — most common complaint
- Thick frost or solid ice buildup on the back wall of the freezer
- Reduced or no airflow from fresh food vents
- Refrigerator runs constantly but can’t maintain temperature
- Evaporator fan running but no cold air reaching the fresh food section
- Defrost cycle runs but frost does not melt off the coils
✔ If these symptoms match, this is the most likely failed component in the defrost system.
✔ In most cases, replacing this defrost heater restores normal frost-free operation immediately.
📦 Part Details
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Part Number: WP12729127
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Type: Refrigerator Defrost Heater — glass-encased resistance heater that melts frost from evaporator coils during the automatic defrost cycle
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Brands: Whirlpool, KitchenAid, Kenmore
⚠️ Replace the Full Defrost Kit While You’re In There:
The defrost heater, defrost thermostat, and defrost timer/control all work together — if the heater has burned out, the thermostat may have failed first and caused the heater to overheat. Replacing just the heater without testing the thermostat risks burning out the new heater within months.
Contact us to source the matching thermostat for your model.
⚙️ Installation
Skill Level: Moderate — 30 to 45 minutes. Unplug the refrigerator before servicing. Remove all freezer contents and shelving, then remove the rear evaporator cover panel to access the coils and heater. Disconnect the heater leads, remove the mounting clips, install the new heater, and reassemble in reverse. Allow the unit to run through a full defrost cycle before confirming the repair.
✓ Compatible Models
Contact us with your model number to confirm compatibility before ordering.
💡 Pro Tip
Manual Defrost Before You Start:
If the evaporator coils are completely iced over, manually defrost the freezer with a hair dryer or by leaving the doors open for several hours before attempting the repair. Trying to remove the evaporator panel with the coils frozen solid risks cracking the panel and damaging the refrigerant lines. A clean defrost first makes the job faster and safer.
