LG Refrigerator er-rt error code
The room (ambient) temperature sensor is faulty. It reads the air temperature around the fridge to help manage cooling.
Also shown as: er-rt, ER-RT, Er rt, er rt
Last updated: October 6, 2026
What causes the er-rt error?
- Failed ambient temperature sensor
- Wiring or connector fault
- Fridge placed in extreme heat or cold
- Failed main control board
How to fix LG er-rt — step by step
Work through these in order, from simplest and safest first. Stop as soon as the code clears.
- Power reset the fridge
Unplug the fridge for 10 minutes, then plug it back in to clear a temporary sensor fault. - Check the fridge location
Make sure the fridge is in a room within normal indoor temperatures with space around it for airflow. Extreme heat or a freezing garage confuses the sensor. - Check ventilation
Pull the fridge slightly away from the wall so heat can escape. Trapped heat around the unit skews the ambient reading.
When to call a technician
- The code returns in a normal room
- Cooling performance is dropping
- The sensor wiring looks damaged
- Other error codes appear alongside it
Frequently asked questions
Can I keep my fridge in the garage with Er rt?
Garages often swing outside the fridge's rated temperature range, which can trigger this code. A climate-controlled spot is better.
Does this sensor affect cooling?
Yes. The fridge uses the room temperature to adjust compressor run times, so a bad reading hurts efficiency.
Will the code clear if I move the fridge?
Sometimes, if the location was the cause. If the sensor itself failed, the code will return anywhere.
Sources
Every meaning and fix above was checked against official manufacturer documentation:
FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.