LG Refrigerator Error Code rt

The rt code on an LG refrigerator signals an abnormal reading from the room temperature sensor, which monitors the ambient temperature around the unit. The fault can be caused by a loose connector at CON8, an open or shorted wire in the sensor circuit, a damaged sensor, or in secondary cases, a failed Main PCB. A resistance check between the brown and brown wires at the sensor should read between 7.0 and 30 kilohms. If it falls outside that range, the sensor or wiring is the likely culprit.

A faulty room temperature sensor does not immediately make the refrigerator unsafe, but it can affect how efficiently the unit operates since it relies on accurate ambient readings to manage cooling. Food safety depends on whether the refrigerator is still maintaining proper internal temperatures, so monitor the compartment temperatures closely. It is best to resolve the rt error promptly to avoid compressor strain or potential food spoilage.

A power reset may temporarily clear the rt code from the display, but the error will return if the underlying cause has not been resolved. The Main PCB continuously monitors the room temperature sensor, so any persistent wiring fault, short circuit, or sensor failure will trigger the code again after the unit powers back up. A reset should be used only after the actual repair has been completed, as a way to confirm the fault is gone.

Some causes of the rt code are DIY-accessible, particularly checking and reseating the connector at CON8, which requires no special tools. Testing resistance with a multimeter between the sensor wires is also within reach for someone comfortable with basic electrical diagnostics. However, replacing the sensor or the Main PCB involves working with internal components and is generally better handled by a qualified technician if you are not experienced with appliance repair.

Repair costs vary depending on the root cause. If only a connector needs reseating, there may be no parts cost at all, though a service call fee typically runs between $75 and $150. A replacement room temperature sensor generally costs between $15 and $50 for the part, with labor on top. A Main PCB replacement is significantly more expensive, with parts ranging from $100 to $300 or more depending on the model, plus labor.