LG Refrigerator Error Code C/R-SEN

C/R-SEN indicates that LG's self-diagnosis system has detected a failure in the center-refrigerator temperature sensor circuit. The control board checks resistance at connector CN30 between pins No.12 and No.14. A reading of 0 ohms points to a short circuit, while an infinite resistance reading points to an open circuit. Both conditions mean the board cannot receive valid temperature data from that sensor.

Continuing to use the refrigerator with an active C/R-SEN fault is risky from a food safety standpoint. Without a functioning center-refrigerator sensor, the control board cannot accurately regulate the compartment temperature, which may cause temperatures to rise above safe levels without any visible indication. It is best to address the fault promptly and use a separate thermometer to monitor the compartment in the meantime.

A power reset may temporarily clear the displayed error code, but the fault will return as soon as the control board completes its self-diagnosis cycle if the underlying problem has not been fixed. Resetting the unit does not repair the sensor, wiring, or connector. A proper resistance check at CN30 pins No.12 and No.14 is required to identify and resolve the root cause before the code will stay cleared.

A knowledgeable DIYer can diagnose this fault by using a multimeter to check resistance at connector CN30 between pins No.12 and No.14. If the connector is simply loose or corroded, reseating or cleaning it may resolve the issue without parts. If the thermistor or wiring harness is confirmed faulty, replacing the sensor is a moderate repair that requires identifying the correct replacement part for your specific LG model.

If only the thermistor needs replacement, parts typically cost in the range of $15 to $50 depending on the model, and a DIY repair requires minimal tools. If professional service is needed, a typical repair visit including labor and parts can range from $100 to $250. Wiring harness repairs or control board replacement will push costs toward the higher end of that range.