Daikin REYQ-TA Series Service Manual page 273

SiUS371614E
Service Diagnosis
Diagnosis Flowchart-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 Flowchart-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 Flowchart-5
U7-05
Error code Sub code
(Multi system error)
Is the model of outdoor
unit REYQ-TA?
YES
NO
NO
NO
Troubleshooting by Error Code
Replace the outdoor unit main
PCB for multi slave 1.
Modify the outdoor unit multi
transmission wirings, and then
reset the power supply.
Replace the outdoor unit main
PCB 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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