LG Refrigerator tt Error
tt is one of the few codes in LG's list with a physical owner check built into its meaning: the tank itself. If the tank is present and fully seated, LG's own second cause — the detection sensor — is what remains.
What to check first
- Check the water tank is present (tt means it is not detected).
- Remove and reseat the tank fully — a partially seated tank is LG's first stated cause.
- tt persists with the tank correct → detection sensor malfunction (LG's second cause): request service.
- No reset is published for tt.
A tt code means the refrigerator cannot detect its water tank. LG's analog list gives the meaning in full: the error occurs when the water tank is missing, or the water tank is not inserted correctly — and if the tank is correctly in place, when the sensor that detects the water tank is malfunctioning. It is a short code with a short logic: check the tank first, because LG lists the tank itself as the first cause; the sensor is the service case behind it.
Safety first
- The water tank is an owner-handled part — removing and reseating it is normal use, and it is the only hands-on step on this page. The detection sensor is not owner territory.
- Stop condition: stop using the machine and unplug it — and do not run it again until it has been checked — if you smell burning, see smoke, find damaged electrics (a scorched plug, a melted or cut cable), or water is leaking in quantity.
Common causes
The water tank is not inserted correctly
LG's first stated cause. A tank that was removed for filling or cleaning and not pushed fully home reads to the refrigerator exactly like a missing tank — because, electrically, it is one.
The water tank is missing
LG's wording covers it directly. A tank left out after cleaning raises the same code.
The tank detection sensor is malfunctioning
LG's second stated cause — the one that remains when the tank is verifiably present and correctly inserted. Sensor diagnosis is service work.
Step-by-step checks
- Open the tank compartment and lookIs the water tank present at all? If it is out of the refrigerator (cleaning, filling), tt is explained. Refit it.
- Reseat the tank fullyRemove the tank and push it back in until it is fully seated, the way your model manual shows for normal refitting. A partially seated tank is LG's first cause — this is the check that answers it.
- If tt persists with the tank correctly insertedLG's remaining cause is the detection sensor malfunctioning. No reset is published for tt (it is not in LG's Er guide), and this page does not borrow one: the list's instruction is to request service. Quote the code and the model number.
When to call a technician
tt gives the owner exactly one real check — the tank — and LG's own text draws the line after it: a correctly inserted tank with a persisting tt is a detection-sensor malfunction, which is service work. Tell LG the tank has been reseated; it saves the first ten minutes of the call.
Model differences
| What you have | What changes |
|---|---|
| Models without a water tank | tt cannot arise from a missing tank on a plumbed model — the detection-sensor cause is the applicable reading; the model manual confirms which water system your refrigerator has. |
| tt vs SS | tt: the tank is not DETECTED (presence). SS (consumer list): an issue detecting the tank's TEMPERATURE. Different detections, different pages. |
One-page checklist — tt
- Tank confirmed present
- Tank removed and reseated fully home
- tt persisted with tank correct → detection sensor: LG service requested
Official LG references
Frequently asked questions
Where is the water tank?
On models that have one, it is the removable reservoir that feeds the dispenser — its exact location is in your model manual. If your refrigerator is plumbed directly to a water line, it has no tank, and tt's applicable cause is the detection sensor.
Can I reset tt?
No reset is published for tt in LG's documentation used — it is not among the Er guide's codes. Reseating the tank is the owner step LG's own meaning implies; beyond that, service.