LG Refrigerator Error Code R0 R1 R2 ON, R3 R4 OFF

This error code indicates a defrost operation failure caused by cut or disconnected wiring in the defrost heater circuit. The relay status combination tells the control board that the heater circuit is open and the heater cannot operate. Without a working defrost heater, frost will accumulate on the evaporator coils and cooling performance will deteriorate. The wiring harness and all connectors in the defrost heater circuit need to be inspected.

Continuing to run the refrigerator with this error active is not recommended. Without a functional defrost heater, frost will build up progressively on the evaporator coils, eventually blocking airflow entirely and causing the refrigerator to stop cooling. Food safety becomes a concern as temperatures rise. Addressing the wiring fault promptly will prevent further complications.

Repair costs depend on the extent of the wiring damage and whether parts need to be replaced. If only a connector needs to be reseated or a terminal repaired, labor costs alone may range from $75 to $150. If a wiring harness section or connector assembly requires replacement, total parts and labor costs typically range from $150 to $350 depending on the model and local labor rates.

Start by unplugging the refrigerator and locating the defrost heater wiring harness inside the freezer compartment. Check every connector for a secure fit, and look for visible wire breaks, burned insulation, or corroded terminals. Use a multimeter to perform a continuity test along the circuit to pinpoint any open condition. If a broken wire or damaged connector is found, the affected section of wiring or the connector will need to be repaired or replaced.

A power reset will not resolve this error because the underlying cause is a physical wiring fault in the defrost heater circuit. The code will return as soon as the control board attempts another defrost cycle and detects the open circuit again. The wiring issue must be repaired before the error will clear permanently.