What tt (Water Tank Error) Means
tt indicates a water tank fault - either the tank is missing, not inserted correctly, or its detection sensor has malfunctioned - per LG's digital-and-analog error-code reference. This is specific to models with an internal water tank/dispenser rather than a direct plumbed water line.
Common Causes of tt (Water Tank Error)
- Water tank not fully inserted or seated
- Water tank detection sensor has failed
- Tank itself is cracked or deformed, preventing a proper seat
🔧 One Safe Check You Can Try
Remove and reseat the water tank, making sure it clicks fully into its housing and isn't cracked or overfilled past its max line, then check whether the code clears.
⚠ Why You Shouldn't Go Further Than That
- If reseating the tank correctly doesn't clear tt, the detection sensor itself likely needs replacement, and that's inside the dispenser housing rather than a simple swap.
- This affects water/ice dispensing only, not core refrigeration - there's no food-safety urgency, so it's reasonable to wait for a scheduled service visit rather than treating it as an emergency.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.