LG Refrigerator Error Code DEFROSTING SENSOR OF R COMPARTMENT

This error means the LG refrigerator has detected a fault in the defrost sensor circuit for the refrigerator compartment. The sensor is reporting a temperature outside the valid range, specifically not lower than 122°F and not higher than -58°F, which indicates a wiring problem, short-circuit, bad connection, or a missing sensor rather than an actual temperature reading. The refrigerator flags this condition because it cannot safely manage the defrost cycle without a reliable sensor signal.

A faulty defrost sensor means the refrigerator may not complete defrost cycles correctly, which can lead to ice buildup on the evaporator and reduced cooling performance over time. Food safety could be affected if cooling is compromised. It is best to address the fault promptly rather than continue running the unit with a known sensor error.

A power reset may temporarily clear the error code, but if the underlying cause such as a broken wire, bad connector, or failed sensor is still present, the code will return. The error reflects an actual circuit condition rather than a software glitch, so the physical fault must be diagnosed and corrected before the error clears permanently.

A knowledgeable DIYer can start by checking the sensor wiring harness for visible damage and reseating the connector at Main PCB CN 30 pins 11 and 14. If the connector is secure and the wiring looks intact, testing voltage at those pins (expected range: 1.0V to 4.5V) requires a multimeter and some comfort working around refrigerator electronics. Replacing the sensor is a moderate repair, but if the fault points to the Main PCB, professional service is recommended.

If the repair requires only a new defrost sensor, parts typically range from $15 to $60 depending on the specific model. Adding professional labor, total repair costs generally fall between $100 and $250. If the Main PCB is at fault, parts and labor costs can range from $200 to $450 or more.