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

This error code indicates a refrigerator compartment sensor failure traced to the sensor wiring or the sensor itself inside the refrigerator control box. The control board has detected either a short circuit or an open circuit in the temperature sensor circuit. This prevents accurate temperature monitoring and can disrupt normal cooling operation.

Continued use is not advisable because a failed temperature sensor means the control board cannot accurately regulate the refrigerator compartment temperature. The fridge may run too cold, potentially freezing food, or not cold enough, allowing food to spoil. It is best to address the error promptly and transfer perishables to another refrigerator in the meantime if cooling performance is visibly affected.

A power reset may temporarily clear the error display, but the code will return if the underlying sensor fault is still present. Because this error is tied to a measurable electrical fault, either a shorted or open sensor circuit, it will persist until the faulty component or wiring is actually repaired or replaced. Resetting without fixing the root cause does not restore accurate temperature sensing.

A technician-level DIYer can address this by using a multimeter to test the thermistor resistance and check wiring continuity through the sensor harness and control box connectors. If the thermistor has failed, replacing it is a manageable repair once the correct part is obtained. However, if the fault points to the control board or involves inaccessible wiring, a professional repair technician is recommended.

If only the thermistor needs replacement, parts typically cost in the range of $15 to $50 depending on the specific model, with professional labor adding $75 to $150 or more. If the control board is at fault, board replacement costs can range from $100 to $300 for the part alone. A full diagnostic by a technician will clarify which component is responsible before committing to parts costs.