Self-diagnosis function
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11
Indoor unit transmission error
Error
No. Error Type Error Point Main Reasons
Indoor unit doesn’t get sig-
nal from ODU for 3 minutes
continuously
1. Indoor 485 transmission PCB fault
2. After PCB replacing, auto addressing
was not done
■Error diagnosis and countermeasure flow chart
Yes
No After Auto addressing,
error code disappears?
Replace indoor unit 485
transmission PCB
No
After ODU main PCB
reset, error code
disappears?
END
Yes