Trouble shooting Flow
Fault diagnosis and Trouble shooting guide
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142
Error Item
Error
Display No.
Major Error Occurrence CauseMeaning
Communication error
between outdoor units
Communication error
between outdoor units
(main outdoor unit -
sub outdoor unit)
• No connection of communication line
• Short or fusing of communication line
• Poor outdoor unit PCB
• Power of outdoor unit is not applied
No
Check or reconnect
communication lines
Yes
Is connection status of the
communication line normal?
No
Check power line of the outdoor unit
Yes
Is power of the outdoor unit
applied?
Check or replace the outdoor unit PCB
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