LG Refrigerator Error Code RT sensor failure (FRZ+REF temp off)

This error indicates the room temperature (ambient) sensor has failed due to a cut or shorted wire in its circuit. The control board cannot receive a valid reading from the sensor and triggers the fault. On the display, all LEDs light up at the same time while both the freezer and refrigerator temperature readings go blank.

A reset may temporarily clear the display, but the error will return if the underlying wiring or sensor fault has not been repaired. Resetting does not fix a cut wire, short circuit, or failed sensor component. The root cause must be identified and corrected to permanently resolve the fault.

Repair costs vary depending on what needs to be replaced. If only a wire repair or connector reseating is needed, costs tend to be lower, generally in the range of $75 to $150 for a service call and labor. If the RT sensor itself requires replacement, parts and labor combined typically fall in the range of $100 to $250. Control board replacement, if ever needed, would be at the higher end of the cost spectrum.

Start by inspecting the wiring and connectors running to the RT sensor for any visible damage, pinching, or looseness. Reseat any connectors that appear loose and look for corroded terminals. If the wiring is intact, the sensor element itself may need to be tested and replaced. A qualified technician can confirm the fault with electrical testing of the circuit.

The refrigerator may continue operating in some capacity, but the control board cannot accurately use ambient temperature data to regulate cooling cycles without a functioning RT sensor. This can affect efficiency and cooling performance. It is best to have the fault diagnosed and repaired promptly to avoid potential food safety concerns from inconsistent temperatures.