Daikin VRV EMERION REYQ-AATJA Service Manual page 443

SiUS372201EB
Part 6 Service Diagnosis
Diagnosis Flowchart-7
UA-27
Error code Sub code
Are
the transmission wires
NO
between indoor unit and
Branch Selector
unit correct?
YES
Is the
NO
Branch Selector unit PCB
correct?
YES
Diagnosis Flowchart-8
UA-28
Error code Sub code
Is the
NO
correct model of Branch
Selector unit
connected?
YES
Troubleshooting by Error Code
Correct the transmission wires.
Replace the indoor unit PCB or the
Branch Selector unit PCB.
Replace the relevant Branch
Selector unit PCB.
Connect the correct model.
Replace the outdoor unit main
PCB (A1P).
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