LG Refrigerator Error Code Er RS2

Er RS2 means the main control board has detected an abnormal signal from the secondary refrigerator temperature sensor, also called the middle room sensor. The fault is caused by either a cut wire, a short circuit, or a loose connection in the sensor circuit. The refrigerator cannot accurately monitor temperature in that zone until the fault is resolved. The first step is to check the connector at CON7 on the main PCB.

A failed secondary sensor can impair the refrigerator's ability to maintain accurate temperatures in the affected zone, which could result in food spoilage over time. The refrigerator may still run, but cooling performance may be unreliable. It is best to address the error promptly and monitor food temperatures closely in the meantime.

If only the wiring or connector needs attention, the repair cost is generally low, often just the cost of a service call ranging from $75 to $150. If the secondary temperature sensor requires replacement, parts typically cost between $20 and $60, with total repair costs including labor ranging from $100 to $250 depending on your location and the technician's rates. Repairing a damaged wiring harness falls somewhere in between depending on the extent of the damage.

Checking and reseating the CON7 connector on the main PCB is a straightforward task that a confident DIYer can perform after unplugging the refrigerator. If the connector is secure and the error persists, diagnosing a wiring short or open circuit and replacing the sensor requires basic electrical knowledge and a multimeter. If you are not comfortable working with wiring or circuit boards, a qualified appliance technician should handle the repair.

A power reset may temporarily clear the error from the display, but the code will return if the underlying fault in the sensor circuit has not been corrected. Resetting without fixing the wiring or sensor issue does not resolve the problem. The reset is only useful for confirming whether a minor connection issue caused the fault after reseating the CON7 connector.