Daikin VRV RXYMQ-A Series Service Manual page 263

SiME332106E
Part 6 Service Diagnosis
Diagnosis Flowchart-1
U7-01
Error code Sub code
(Transmission error when the
external control adaptor is mounted)
Is
there any
wiring
disconnection or wiring
NO
error in the transmission
wirings to the external
control adaptor for
outdoor unit?
YES
Is the
microcomputer
NO
normal monitor on the
outdoor unit main PCB
blinking?
YES
Is the
microcomputer
NO
normal monitor on the
external control adaptor
for outdoor unit
blinking?
YES
NO
Is power supplied to
the outdoor unit?
YES
Is the
power supply
cable of the external
NO
control adaptor for outdoor
unit connected to the
16 VDC power
supply line?
YES
Troubleshooting by Error Code
Modify the transmission wirings
to the external control adaptor for
outdoor unit.
Supply power to the outdoor
unit.
Replace the outdoor unit main
PCB (A1P).
Connect the power supply cable
of the external control adaptor
for outdoor unit to the 16 VDC
power supply line.
Replace the external control
adaptor PCB.
Replace the outdoor unit
main PCB (A1P).
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