Trouble shooting Flow
Fault diagnosis and Trouble shooting guide
105
108
Error Item
Error
Display No.
Major Error Occurrence CauseMeaning
Communication error
between main PCB and
fan PCB
Communication error
between main PCB
and fan PCB
• No connection of communication line
• Short or fusing of communication line
• Poor outdoor unit PCB
• Power input when the DC link capacitor
discharges
No
Check or reconnect
communication lines
Yes
Is communication
line between the main PCB and the fan
PCB normal?
No
Turn on a few minutes after power off
Yes
Is the communication LED on?
Check or replace the main PCB/the fan PCB
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