Fault diagnosis and Trouble shooting guide
Title
Display
code
Cause of errorMeaning
Transmission
error from main
PCB to inverter
PCB in the
outdoor unit
57
• 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 inverter
PCB can not receive any
signal
from main PCB
successively for 20
seconds
Trouble shooting Flow
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
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