LG H05TN4 Owner's Manual page 26

Error Signals on the Display
In case of error, the display on the indoor unit shown the following error codes:
RUN lamp
Flashes once
Flashes twice
Flashes 6 times
Display code
26
Description of the trouble
The fault of indoor temperature sensor.
The fault of indoor pipe temperature sensor.
Malfunction of indoor fan motor.
Refrigerant leakage.
EN