LG Refrigerator Error Code Er (rS - sensor 2)

This code means the main control board has detected a problem with refrigerator sensor 2, either a broken wire causing an open circuit or a short circuit in the sensor or its wiring. The sensor is a thermistor that monitors temperature in the refrigerator compartment. Notably, the compressor and evaporator fan continue operating normally when this code appears, so the issue is limited to the sensor circuit itself.

Because the compressor and fan continue to run with this error, your refrigerator may still be cooling to some degree. However, without a functioning sensor, the control board cannot accurately regulate temperatures, which puts food safety at risk over time. It is best to address the fault promptly and monitor food temperatures closely in the meantime.

A reset may temporarily clear the error code from the display, but the code will return if the underlying sensor fault is still present. The control board will detect the abnormal resistance reading again once it resumes normal monitoring cycles. A permanent resolution requires diagnosing and repairing or replacing the faulty sensor, wiring, or connector.

If you are comfortable using a multimeter and working around appliance wiring, you can diagnose this error yourself by testing the resistance of sensor 2 at its connector. If the sensor reads open or shorted, replacing the thermistor is a relatively straightforward repair. However, if the fault is in the wiring harness or the control board, the repair becomes more involved and may benefit from professional service.

If only the thermistor needs replacement, parts typically range from around $15 to $50 depending on the specific model, and the repair is relatively quick. If a service technician is needed, expect total costs in the range of $100 to $250 including labor. Control board replacement, if required, will cost significantly more, often in the $200 to $500 range for parts and labor combined.