Communication Error Between Outdoor Unit And Indoor Unit - LG multi V PLUS Service Manual

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