LG Refrigerator Error Code R1

The R1 error code means the control board has detected a cut or short circuit in the wiring of the refrigerator compartment temperature sensor, called the R sensor. The board cannot receive a valid temperature reading from that sensor. While the error is active, the refrigerator runs the compressor, cooling fan, and defrost heater on fixed default cycles rather than adjusting to actual temperatures.

The refrigerator will continue to operate in a default mode during the R1 error, so it will not shut off completely. However, because the compressor and fans run on fixed cycles rather than responding to actual compartment temperatures, food temperatures may not stay within safe ranges consistently. It is best to repair the fault promptly and monitor food temperatures closely in the meantime.

Resetting the refrigerator by unplugging it for a few minutes may temporarily clear the R1 code, but the error will return if the underlying wiring fault or sensor defect has not been corrected. The control board will detect the same problem the next time it checks the R sensor circuit. A reset is only a lasting fix if the fault was caused by a temporary condition such as a loose connector that has since been reseated.

A knowledgeable DIYer can diagnose this code by visually inspecting the R sensor wiring for cuts, pinches, or loose connectors, and by testing the sensor with a multimeter. If the wiring is intact and the sensor tests bad, replacing the thermistor is a manageable repair. However, if the wiring harness is damaged or the control board is at fault, the repair may require more advanced skills or a professional technician.

Repair costs depend on what is actually faulty. A replacement R sensor thermistor typically costs in the range of $15 to $50 for the part. A wiring harness repair or replacement can range from $20 to $100 or more depending on the extent of the damage. If the control board needs to be replaced, costs can range from $100 to $300 or higher for the part alone, with additional labor costs if a technician is needed.