Trouble shooting Flow
Fault diagnosis and Trouble shooting guide
53
Error Item
Error
Display No.
Major Error Occurrence CauseMeaning
Communication error
(indoor unit - main PCB)
If failing to receive
indoor unit signal at
main PCB
• No connection of communication line
• Short or fusing of communication line
• Poor outdoor unit PCB or indoor unit PCB
No
Check and connect power line.
Yes
Is power supplied to all indoor units?
No
Check and connect the
communication line.
Yes
Are communication
lines of indoor units normal?
No
Perform automatic addressing again.
Yes
Is automatic addressing
performed accurately?
No
Check or replace the main PCB
Yes
Is communication circuit part of the
outdoor unit normal?
Check or replace the indoor unit PCB
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