Daikin FCQ18PVJU Service Manual page 158

Troubleshooting by Indication on the Unified ON/OFF Controller
Troubleshooting
151
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts could be damaged.
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
YES
YES
NO
YES
Is
the group
NO
No. of malfunctioning
indoor units
set?
YES
NO
YES
SiUS28-902_a
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.
Replace the indoor unit P.C.B.
Fix the wiring correctly.
Connect the connector
correctly.
Replace the central P.C.B.
Troubleshooting