LG Refrigerator Error Code RT sensor error

The RT sensor error means the refrigerator has detected a failure in the Room Temperature sensor circuit. The fault is caused by either a cut wire creating an open circuit or a short circuit in the sensor wiring, both of which produce a signal the control board cannot interpret as valid. You can confirm the error is active by pressing and holding the SUPER FRZ and FRZ Temp buttons together for at least one second to enter diagnostic mode.

The RT sensor monitors ambient room temperature rather than internal cabinet temperature, so the refrigerator may continue cooling food in the short term. However, the control board relies on this data to optimize operation, so running the unit with an unresolved sensor fault for an extended period is not recommended. Address the error as soon as practical to avoid potential performance issues.

A power reset may temporarily clear the error code display, but if the underlying wiring or sensor fault is still present, the error will return once the control board re-evaluates the circuit. Clearing the code without fixing the root cause does not resolve the problem. The sensor wiring and connector should be inspected and repaired before assuming the reset has resolved the fault.

A knowledgeable DIYer can address this error by inspecting and reseating the RT sensor connector, which requires no special tools and no parts. If the wiring harness is visibly damaged or the sensor itself has failed, repairs require splicing wires or replacing components, which is more involved but still achievable with basic electrical skills. If the fault traces back to the control board, professional diagnosis is recommended.

If the fix is simply reseating a loose connector, there is no parts cost and only the time investment of a DIY repair. Replacing a damaged wiring harness or the RT sensor itself typically involves parts costs in the range of $15 to $60 depending on the component, plus labor if a technician is hired. A control board replacement, if needed, is the most expensive scenario and can range from $100 to $300 or more for parts alone.