LG Refrigerator Error Code R3

The R3 code on an LG refrigerator signals a defrosting failure. Specifically, it indicates that the control system has detected an open circuit in the defrost heater wiring or a blown temperature fuse. The code appears at least 2 hours after the fault is first detected, and during that time the compressor and fan run in a 15-minute ON / 15-minute OFF cycle with no defrosting taking place.

While the R3 code is active, the refrigerator operates in a reduced mode with the compressor and fan cycling 15 minutes ON and 15 minutes OFF, but no defrosting occurs. Over time, frost will accumulate on the evaporator coils and block airflow, causing cooling to deteriorate significantly. Food safety can become a concern as temperatures rise, so the issue should be diagnosed and repaired promptly rather than ignored.

Repair costs vary depending on the failed component and whether you hire a technician or do the work yourself. A replacement temperature fuse is generally an inexpensive part, typically in the range of $5 to $20. A defrost heater element can cost anywhere from $20 to $80 or more for the part alone. If you hire a technician, labor charges will add to the total, and most appliance repair service calls run between $100 and $300 depending on your location and the complexity of the repair.

A knowledgeable DIYer can perform basic diagnostics, including visually inspecting the defrost heater wiring harness for cuts or disconnected terminals and testing the temperature fuse for continuity with a multimeter. If the fuse is blown or the heater element has failed, replacing these components requires accessing the evaporator compartment and working with electrical components, which carries some risk. If you are not comfortable with appliance electrical work, a qualified technician is recommended.

A simple power reset will not permanently clear the R3 code if the underlying fault in the defrost heater circuit is still present. The code will return once the control board re-detects the open circuit, typically within a few hours. The fault must be physically repaired, whether that means replacing a blown thermal fuse, repairing a broken wire, or replacing the defrost heater, before the error will clear and stay clear.