Daikin REYQ-TA Series Service Manual page 272

Troubleshooting by Error Code
259
Diagnosis Flowchart-2
U7-02
Error code Sub code
(Transmission error when the external
control adaptor for outdoor unit is mounted)
Unified Cool/ Heat
selection
YES
Cool/Heat
selection for the
external control adaptor
for outdoor unit is set to
"Unified Master".
NO
Cool/Heat
selection for the
external control adaptor
for outdoor unit is set
to "Unified
Slave".
YES
Is
the normal
operation monitor
LED on the outdoor unit
main PCB
blinking?
YES
Is the
normal
operation monitor
LED on the external control
adaptor for outdoor
unit blinking?
YES
Does the
error recur when
setting Cool/Heat
selection for the external
control adaptor for
outdoor unit to
"IND"?
YES
NO
YES
NO
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
NO
SiUS371614E
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).
NO
Supply power to the
outdoor unit.
Replace the outdoor unit
main PCB (A1P).
NO
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 PCB.
Replace the outdoor unit
main PCB (A1P).
Service Diagnosis