LG Multi V CRUN Series Service Manual page 224

Self-diagnosis function
Fault diagnosis and Trouble shooting guide
Display
Title
code
Outdoor unit
indoor unit
05
transmission
error
Trouble shooting Flow
Transmission
error in all of
indoor units?
Yes
Does it execute
automatic
addressing?
Yes
Is the state of
transmission in
outdoor unit
normal?
Yes Yes
Check and replace
outdoor unit PCB
224 Trouble Shooting Guide
Meaning
In the case that indoor unit
can not receive any signal
from outdoor unit
successively for 3minutes
No
No
No
Repair the
connection
Execute automatic
Cause of error
• Automatic addressing problem.
• Unplugging of transmission connector
• Misconnection or open of transmission cable
• Malfunction of indoor unit transmission circuit
• Malfunction of outdoor unit transmission circuit
• The distance between power cable and
transmission cable is not enough.
In indoor unit which
displays error code
Is the state of
connection for
transmission
is normal?
Yes
Check and replace
indoor unit PCB
addressing
No
Repair the
connection