Daikin VRV EMERION REYQ-AATJA Service Manual page 441

SiUS372201EB
Part 6 Service Diagnosis
Diagnosis Flowchart-3
UA-20
Error code Sub code
NO
Multi connection?
YES
Was the
NO
outdoor unit
main PCB replaced with
a spare PCB?
YES
NO
Was proper setting
of spare PCB
made?
YES
Diagnosis Flowchart-4
UA-21
Error code Sub code
A
Branch Provider
YES
unit is connected in a
system with multi
outdoor units.
NO
A
Branch
Selector unit and a
YES
Branch Provider unit are
mixed in the same
system.
NO
VRV
indoor units are
YES
connected in a system with
a Branch Provider unit.
NO
Troubleshooting by Error Code
Replace the outdoor unit main
PCB (A1P).
A
NO
different model
Replace the outdoor unit main
of outdoor unit is
PCB (A1P).
connected.
YES
Check for the model of outdoor
unit.
Make setting again, and then
reset the power supply.
Replace the spare PCB.
Error in the system design.
Replace with a single outdoor unit
system or eliminate the Branch
Provider unit.
Error in the system design.
Eliminate the Branch Selector unit
or Branch Provider unit.
Error in the system design.
Eliminate the Branch Provider unit
or VRV indoor units.
Correct the wirings. If no defect is
found in the wirings, replace the
outdoor unit main PCB (A1P).
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