LG multi V PLUS, Service Manual

Page: 265 / 373

Service Manual 265
Self-diagnosis function
No
No
Normal connection
of communication line
Yes
Yes
Check or replace the
relevant indoor unit Check or replace the
indoor unit PCB
No
No
No
Yes
Yes
Yes
Fault diagnosis and Trouble shooting guide
05
Failure Checking Method
Yes
Communication
error between
outdoor unit
and indoor unit If failing to receive outdoor
unit signal at the indoor unit
for consecutive 3 minutes
• Where connection of communication line is not
done
• Where communication line is short
• Failure of communication circuits of indoor unit
• Failure of communication circuits of outdoor unit
• Where distance between power line and
communication line is not sufficient
Does communication
error occur in the whole of
indoor unit?
Does error in a number
of indoor units occur?
Is connection status
of communication
line normal?
Is there
indoor unit that fan
does not operate in blowing operation
among indoor units not
indicate No.5 error?
Is status of the
communication line
normal?
• Check power of the
outdoor unit turns on
• Check and replace the
outdoor unit PCB
Error Item
Error Display
No.
Major Error Occurrence Cause Meaning