Fault diagnosis and Trouble shooting guide
Title
Display
code
Cause of errorMeaning
No
Is the transmission
line connection /
Connector normal?
Yes
Is the transmission
circuit of main PCB
normal?
Yes
Check and Replace the
main PCB
No
Check and replace the
inverter PCB
Repair the connection /
connector
Transmission
error from
inverter PCB to
main PCB in
the outdoor
unit
52
• The connector for transmission disconnected
• The transmission line is misconnected or shorted
• Transmission circuit of main PCB is abnormal
• Transmission circuit of inverter PCB is abnormal
In the case that main PCB
can not receive any signal
from inverter PCB
successively for 20
seconds
Trouble shooting Flow
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