Service manual
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11.9 Outdoor unit protects
11.10 Indoor unit communication error.
Check the if the signal wire is well connection
Change indoor PCB and check if the error is still exit
Connect the signal wire well or change the
signal wire if it’s the problem of the wires.
No
Yes
Indoor PCB failure
No
Outdoor PCB failure, change outdoor PCB
Yes
Check if the power supply is good
Change outdoor PCB and check if the error is still exit
Power supply failure
No
Yes
Outdoor PCB failure
No
Compressor failure
Yes
