Daikin RXYQ-TA Series Service Manual page 287

SiUS341615E
Service Diagnosis
Diagnosis Flow-3
U7-03
Error code Sub code
(Transmission error between master
and slave 1)
The
multi transmission
wirings to multi slave 1 have
caused wiring disconnection in
them or are being
disconnected.
YES
Diagnosis Flow-4
U7-04
Error code Sub code
(Transmission error between master
and slave 2)
The
multi transmission
wirings to multi slave 2
have caused wiring disconnection in
them or are being
disconnected.
YES
Diagnosis Flow-5
U7-05
Error code Sub code
(Multi system error)
Is the model of outdoor
unit RXYQ72-168TA?
NO
NO
NO
YES
Troubleshooting by Error Code
Replace the outdoor unit main
PCB (A1P) for multi slave 1.
Modify the outdoor unit multi
transmission wirings, and then
reset the power supply.
Replace the outdoor unit main
PCB (A1P) for multi slave 2.
Modify the outdoor unit multi
transmission wirings, and then
reset the power supply.
Replace the outdoor unit main
PCB (A1P).
Disconnect the outdoor unit multi
transmission wirings, and then
reset the power supply.
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