Daikin RXYQ72 Serivce Manual page 220

SiUS39-601
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Is a
malfunction
code displayed on the
remote controller?
NO
Has a
once connected
indoor unit been removed
or its address
changed?
NO
Is the
power supply for
the indoor unit displaying
a malfunction
turned
on?
YES
Is
transmission wiring
disconnected or wired
incorrectly?
NO
Is
transmission
with all indoor units
malfunctioning?
YES
Is the
transmission
wiring with the master
controller disconnected or
wired incorrectly?
YES
Is the
master
controller's connector for
setting master controller
disconnected.
NO
Replace the central PC board.
Troubleshooting (OP: Unified ON/OFF Controller)
YES
YES
NO
YES
Is
the group
NO
No. of malfunctioning
indoor units
set?
YES
Replace indoor unit PC board.
NO
YES
Diagnose the cause with the
air conditioner's failure
diagnosis manual.
Reset power supply for all
optional controllers for
centralized control
simultaneously.
Turn the power supply of the
indoor unit on.
Fix the wiring correctly.
NO
Set the group No.
correctly.
Fix the wiring correctly.
Connect the connector
correctly.
(V2841)
209