LG Refrigerator Error Code R1 R3 ON

The R1 R3 ON error code means the refrigerator has detected an open circuit or short circuit in one or more of the refrigerator compartment temperature sensors. These sensors are thermistors that monitor internal temperature and send readings to the main control board. When a sensor's resistance reading falls outside the expected range, the board flags this error. The refrigerator may not cool properly while this fault is active.

Operating the refrigerator with this error is not recommended for extended periods because the control board cannot accurately regulate compartment temperature without functioning sensors. Food safety may be at risk if the refrigerator is not maintaining proper temperatures. It is best to check internal temperatures with a standalone thermometer and address the fault promptly.

Repair costs vary depending on what component has failed. Replacement thermistor sensors are relatively inexpensive, typically in the range of $10 to $40 per sensor for parts. If the main control board is at fault, parts costs can range from $100 to $300 or more. Adding a technician's labor charge will increase the total, generally bringing a professional repair to somewhere between $100 and $400 depending on the specific failure and local labor rates.

Start by inspecting the wiring and connectors for the R1 and R3 sensors, looking for breaks, corrosion, or loose connections and re-seating any connectors that appear loose. Use a multimeter to test the resistance of each thermistor to determine if a sensor has failed internally. If a sensor tests as open or shorted, replace it. If the sensors and wiring both check out, the main control board may need to be evaluated.

A reset may temporarily clear the error code from the display, but it will return if the underlying sensor or wiring fault has not been corrected. Resetting is useful for confirming whether the fault is intermittent, but it is not a fix. The root cause, whether a failed thermistor, damaged wiring, or a bad connection, must be identified and repaired to permanently resolve the code.