LG Refrigerator Error Code R-SEN

R-SEN is an error code indicating that LG's self-diagnosis system has detected a failure in the refrigerator compartment temperature sensor. The sensor circuit has either shorted to 0 ohms or opened to infinite ohms, both of which prevent the control board from accurately reading the compartment temperature. The fault is confirmed by measuring resistance at connector CN30, between pins No.10 and No.14.

Operating the refrigerator with an active R-SEN code carries a risk of inadequate cooling, because the control board cannot accurately regulate compartment temperature without a working sensor. Food safety may be compromised if temperatures rise above safe levels. It is best to address the fault promptly and monitor internal temperatures closely in the meantime.

A power reset may temporarily clear the R-SEN code from the display, but if the underlying sensor, wiring, or connector fault still exists, the code will return shortly after the refrigerator resumes operation. A reset is not a repair. The resistance at CN30 pins No.10 and No.14 must fall within a normal range before the fault will stay cleared.

A knowledgeable DIYer can start by inspecting the CN30 connector for loose or corroded pins and reseating the harness. If that does not clear the code, a resistance test at CN30 pins No.10 and No.14 will determine whether the sensor has shorted or opened. Replacing the thermistor is a moderate DIY repair, but if the main control board is found to be at fault, professional service is recommended.

If only the thermistor needs replacement, parts typically range from $15 to $50, with professional labor adding $80 to $150 depending on location. If the main control board is at fault, parts alone can range from $100 to $300 or more. Getting a diagnostic estimate from a technician before committing to parts is advisable.