Samsung Refrigerator Error Code FREEZER-DEFROST-FUNCTION ERROR

This error means the freezer defrost heater ran continuously for more than 80 minutes without the defrost cycle completing as expected. The refrigerator's control board detected this abnormal condition and logged the fault. The problem is typically caused by a failed bimetal thermostat, a defective heater element, or a wiring fault in the defrost circuit. Left unaddressed, frost will accumulate on the evaporator coils and impair cooling performance.

Continued use with this error active is not recommended for extended periods. Without a functioning defrost cycle, frost accumulates on the evaporator coils and blocks airflow, which will progressively reduce cooling in both the freezer and fresh food compartments. In the case of a shorted heater, there is also a potential risk of excessive heat in the evaporator area. It is best to have the fault diagnosed and repaired promptly.

Repair costs depend on which component has failed. A bimetal thermostat or thermal fuse is generally an inexpensive part, with total repair costs including labor typically ranging from around $100 to $200. Replacing the full defrost heater assembly tends to cost more, often falling in the $150 to $350 range depending on the specific model and labor rates in your area. If the main PCB is found to be contributing to the fault, costs can increase significantly.

Some steps are accessible to a confident DIYer with a multimeter, particularly the initial resistance check between the CN70 White and CN72 Gray wires after unplugging the CN70 connector from the main PCB. A reading of 0 ohms points to a shorted heater, while infinite resistance points to an open circuit in the bimetal thermostat, heater element, or wiring. Replacing the bimetal thermostat or defrost heater is a moderately involved repair that requires removing freezer interior panels to access the evaporator assembly. If you are not comfortable working around electrical components, a qualified technician should perform the repair.

A power reset may temporarily clear the error display, but it will not resolve the underlying hardware fault. If the defrost heater circuit has a failed bimetal thermostat, a shorted heater, or an open wiring connection, the defrost cycle will fail again and the error will return. A full repair of the defective component is required for a permanent fix.