Daikin VRV RXYQ72-384XAYCA Service Manual page 342

Troubleshooting by Error Code
335
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
normal
NO
operation monitor LED
on the outdoor unit
main PCB
blinking?
YES
Is the
normal
operation monitor LED NO
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
NO
external control adaptor
for outdoor unit connected
to the 16 VDC
power supply
line?
YES
SiUS342004EB
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).
Part 6 Service Diagnosis