LG SXS Refrigerator User Manual page 17

Operation
Ambient temperature display window.
Temperature is displayed only by –9°C ~ 49°C.
Temperature less than -10°C is indicated with 'LO' and temperature more than
50°C is indicated with 'HI'.
Temperature may differ from the actual ambient temperature as it is monitors
on the upper part of refrigerator (top of door).
Door open warning
3 times of warning sounds at the interval of 30 seconds if a minute passes with
the door of refrigerator and the hombar door opened or completely closed.
Please contact with the local service center if warning continue to sound even
after closing the door.
Diagnosis (failure detection) function
Diagnosis function automatically detects failure when failure is found in product
during the use of refrigerator.
If failure occurs at product, it does not operate though pressing any button and
normal indication is not done. In this case, do not turn power off but immediately
contact with the local service center. A lot of time are need for service engineer
to detect the failed part if turning it off.