LG Refrigerator rT Error
rT is documented in LG's digital and analog list only — it is not among the codes in LG's Er guide, which is why no Er reset is printed on this page.
What to check first
- Code read exactly (rT)
- No borrowed reset attempted — none is published for this code
- LG service requested with the model number
rT is a temperature sensor fault. LG's list defines this sensor by what it reads: installed inside the refrigerator, it detects the ambient temperature — the room air — and transmits it to the PCB.
Safety first
- Sensors live inside the cabinet, wired to the main board — do not open the cabinet to reach them. LG provides no owner troubleshooting procedure for this code in the cited consumer source; its published instruction is to request service.
- 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 sensor itself is faulty
LG's list defines this sensor by what it reads: installed inside the refrigerator, it detects the ambient temperature — the room air — and transmits it to the PCB. LG's sensor section states the consequence plainly: when a sensor fails, the display shows an error code and the performance of the product is reduced — the board is steering the refrigerator with a broken thermometer.
The board loses its picture of the room
Ambient readings feed the refrigerator's compensation for hot and cold rooms — the same sensing behind the Lo and HI warnings. LG's general sensor note is the documented consequence: with a failed sensor, the performance of the product is reduced.
Step-by-step checks
- Note the exact codeRecord the display form (rT) and what the affected compartment is doing — the sensor's job is temperature reporting, so its symptom is wrong or drifting temperatures.
- No reset is published for this code — do not borrow onerT does not appear in LG's Er guide, so the Er family's 5-minute reset is not published for it, and this page does not borrow it. LG's digital and analog list — the source that documents rT — carries one instruction for its fault codes: request service.
- Request serviceQuote the exact code (rT) and the model number. rT is not in LG's Er guide, so no reset is published for it.
When to call a technician
rT is a service code from the start: LG's only published instruction for it is to request service. Quote the exact code and the model number; the technician works from the model manual, which is also where this code's component-level diagnosis lives.
Model differences
| What you have | What changes |
|---|---|
| rT vs Lo / HI | Lo and HI report the room truthfully. rT reports a failed ambient sensor — the readings themselves can no longer be trusted. |
| Not in the Er guide | rT appears in LG's digital and analog list only. No Er rT is listed, and this page does not treat the Er guide's "Er r" as rT — LG nowhere equates them. |
One-page checklist — rT
- Code read exactly (rT)
- No borrowed reset attempted — none is published for this code
- LG service requested with the model number
Official LG references
Frequently asked questions
Can I keep using the refrigerator with rT showing?
LG publishes no use rule for rT — its list's instruction for the code is to request service. What LG does say for its sensor family is that a failed sensor reduces the product's performance, because the board no longer receives true temperatures.