Daikin VRV EMERION REYQ-AATJA, Service Manual

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SiUS372201EB Troubleshooting by Error Code
Part 6 Service Diagnosis 434
NO
YES
YES
YES
NO
NO
Replace the outdoor unit main
PCB (A1P).
Check for the model of outdoor
unit.
Make setting again, and then
reset the power supply.
Replace the spare PCB.
NO
YES
Replace the outdoor unit main
PCB (A1P).
Was the
outdoor unit
main PCB replaced with
a spare PCB?
A
different model
of outdoor unit is
connected.
Diagnosis Flowchart-3
Error code Sub code
UA-20
Multi connection?
Was proper setting
of spare PCB
made?
Diagnosis Flowchart-4
NO
Correct the wirings. If no defect is
found in the wirings, replace the
outdoor unit main PCB (A1P).
YES
NO
YES
NO
YES
Error in the system design.
Replace with a single outdoor unit
system or eliminate the Branch
Provider unit.
A
Branch
Selector unit and a
Branch Provider unit are
mixed in the same
system.
A
Branch Provider
unit is connected in a
system with multi
outdoor units.
Error in the system design.
Eliminate the Branch Selector unit
or Branch Provider unit.
VRV
indoor units are
connected in a system with
a Branch Provider unit.
Error in the system design.
Eliminate the Branch Provider unit
or
VRV indoor units.
Error code Sub code
UA-21