Daikin VRV RXYQ72-384XAYCA Service Manual page 351

SiUS342004EB
Part 6 Service Diagnosis
Diagnosis Flowchart-5
UA-29
Error code Sub code
Is there
Yes
any branch selector
unit connected?
NO
Was the
outdoor unit main
NO
PCB replaced with
a spare PCB?
YES YES
Is the
NO
procurement of the
spare PCB proper?
YES
Troubleshooting by Error Code
Incorrect system setup.
Check if system is heat pump or
heat recovery.
Replace the outdoor unit main PCB
(A1P).
Procure a proper spare PCB.
Replace the outdoor unit main PCB
(A1P).
344