Daikin VRV EMERION RXYQ-AATJA Service Manual page 366

Troubleshooting by Error Code
359
Diagnosis Flowchart-4
UA-21
Error code Sub code
Diagnosis Flowchart-5
UA-31
Error code Sub code
Is the multi
NO
combination of
outdoor units
proper?
YES
Was the
NO
outdoor unit main
PCB replaced with a
spare PCB?
YES YES
Is the
NO
procurement of the
spare PCB proper?
YES YES
NO
Is the setting of the
spare PCB proper?
YES
SiUS342303E
Replace the outdoor unit main
PCB (A1P).
Correct the multi combination of
outdoor units.
Replace the outdoor unit main
PCB (A1P).
Procure a proper spare PCB.
Make setting again, and then reset
the power supply.
Replace the outdoor unit main
PCB (A1P).
Part 6 Service Diagnosis