Daikin VRV X RXQ6-48ANR Series Service Manual page 259

SiME341909EA
Part 6 Service Diagnosis
Diagnosis Flowchart-4
UA-21
Error code Sub code
Diagnosis Flowchart-5
UA-31
Error code Sub code
Is the multi
combination of
outdoor units
proper?
YES
Was the
outdoor unit main
PCB replaced with a
spare PCB?
YES YES
Is the
procurement of the
spare PCB proper?
YES YES
Is the setting of the
spare PCB proper?
YES
NO
NO
NO
NO
Troubleshooting by Error Code
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).
253