Jenn-Air JS42NXFXDE Built-In 42 in 20.7 cu ft Built-In Side-by-Side Refrigerator with Advanced Water Filtration dF Error Fix: Defrost Failure

Error code dF on the Jenn-Air JS42NXFXDE Built-In 42 in 20.7 cu ft Built-In Side-by-Side Refrigerator with Advanced Water Filtration means: Defrost Failure. The automatic defrost system has failed — the evaporator coils are icing over, reducing or eliminating cooling capacity; on Jenn-Air Preserva models with dual evaporators, this may affect only the freezer or fresh food section depending on which evaporator is affected; check the defrost heater for continuity (should read 20-50 ohms); check the defrost thermostat/bi-metal (should be closed at cold temperatures, open above approximately 50°F); check the defrost timer or adaptive defrost control (ADC) board; a failed defrost heater is the most common cause; on built-in models, access the evaporator by removing the freezer rear panel

The most successful fix is "Test and Replace Defrost Heater and Defrost Thermostat" (hard difficulty, ~60 minutes). Estimated DIY cost: $20-$50. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Test and Replace Defrost Heater and Defrost Thermostat") is rated hard difficulty and takes about 60 minutes. Tools needed: Phillips screwdriver, Multimeter, Flashlight.

DIY cost: $20-$50. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

The Jenn-Air JS42NXFXDE Built-In 42 in 20.7 cu ft Built-In Side-by-Side Refrigerator with Advanced Water Filtration has 8 other known error codes, including: CF (Communication Failure), CO (Compressor Overload / Overcurrent), dH (Defrost Heater Open), dt (Defrost Thermostat (Bi-Metal) Fault), FC (Fresh Food Fan Not Operating), and 3 more.

Error code dF also appears on 2 other Jenn-Air models: JB36NXFXLE 36 in Built-In French Door Refrigerator with Preserva Food Care, JFFCC72EFS French Door 22.1 cu ft French Door Refrigerator with Turbo Cool and LED Lighting. The fix may vary by model, so check each model's specific page for tailored repair steps.