Daikin VRV RXYQ72-384XAYCA Service Manual page 343

SiUS342004EB
Part 6 Service Diagnosis
Diagnosis Flowchart-2
U7-02
Error code Sub code
(Transmission error when the external
control adaptor for outdoor unit is mounted)
NO
Unified Cool/Heat
selection
YES
Cool/Heat
selection for the
YES
external control adaptor
for outdoor unit is set to
"Unified Master".
NO
Cool/Heat
selection for the
NO
external control adaptor
for outdoor unit is set
to "Unified
Slave".
YES
Is the
normal
operation monitor NO
LED on the outdoor unit
main PCB
blinking?
YES
Is the
normal
operation monitor
NO
LED on the external control
adaptor for outdoor
unit blinking?
YES
Does the
error recur when
setting Cool/Heat
NO
selection for the external
control adaptor for
outdoor unit to
"IND"?
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
Troubleshooting by Error Code
Set Cool/Heat selection
for the external control
adaptor for outdoor unit
to "IND."
Unified Cool/Heat
addresses for outdoor
units in the
outdoor-outdoor
transmission are
duplicated. Make
address setting again.
Replace the outdoor unit
main PCB (A1P).
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 for
outdoor unit main PCB.
Replace the outdoor unit
main PCB (A1P).
336