Written by
Maya Chen Editorial TeamPublished September 5, 2026Updated October 20, 2026
Error coderT
ApplianceRefrigerator
Quick answer
rT means the ambient (room) temperature sensor has a fault, shorted or open. Performance is reduced and service is requested.
Model compatibility: LG reuses codes across series and model years, so rT may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
rT is a fault in the ambient temperature sensor, described as a shortened or open room temperature sensor.
With rT on the display, an LG refrigerator is reporting a fault in its ambient temperature sensor. The help library words it as a shortened or open room temperature sensor, and the manual adds that it reduces the appliance’s performance.
What LG advises
No troubleshooting steps are listed, and the refrigerator requires a repair service. Analog models show it as an external sensor error, with LEDs lit at -17°C, -20°C and -23°C, and LG asks for service for an accurate diagnosis. A technician examines the connection for a short circuit or break.
Related codes
Lo: a warning that the surroundings are very cold, which is not a sensor fault.
Call (310) 742-8008 to talk through an rT code, or browse LG refrigerator service first. Keep the model number and a note of what the display shows within reach.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your LG appliance?
Book a specialist visit for a clear estimate and approval before any repair.
