Written by
Maya Chen Editorial TeamPublished October 20, 2026
Error codett
ApplianceRefrigerator
Quick answer
tt flags the water tank. Check that it is installed correctly; a malfunctioning detection sensor is the other possibility.
Model compatibility: LG reuses codes across series and model years, so tt 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
tt is a water tank fault: the tank is missing or not inserted correctly, or the detection sensor is malfunctioning.
When tt appears, the refrigerator is telling you something is wrong with the water tank. LG gives three possibilities: the tank is missing, it is not inserted correctly, or the detection sensor is malfunctioning.
Start with the tank
The one owner check on record is to make sure the tank is installed correctly. Remove it and seat it again if it is not sitting properly. If the tank is in place and tt stays, the sensor that detects it may be the cause, which is a matter for service.
If tt will not clear, call (310) 742-8008 for LG refrigerator help in Los Angeles. More is on the LG refrigerator repair page. Be ready to say you checked the tank and give the model number.
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.
