Written by
Marcus Lindqvist Appliance Care EditorPublished October 26, 2026
VERIFIED
Error codett
ApplianceRefrigerator
tt concerns the water tank. LG offers three explanations: nobody put a tank in, it was not inserted correctly, or the sensor that detects the tank is malfunctioning.
What to try
Look for the tank in the refrigerator.
Check it is installed correctly, and remove and reseat it if it is not.
Read the display again. A code that stays can mean the detection sensor, which is a matter for service.
Other sensor codes
Zone temperature sensors are listed under r2 for the lower refrigerator zone and HS for humidity.
LG refrigerator service in San Francisco
If tt persists with the tank seated, phone (415) 223-7887 from San Francisco or the Bay Area. Describe what you did with the tank and read out the model number. See LG refrigerator repair for more.
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
A water tank fault: the tank is missing or not inserted correctly, or the detection sensor is malfunctioning.
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.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
Service areas are listed on the Locations page. Contact us with your ZIP code to confirm current coverage for your address.
Ready to get your LG appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
