Daikin RTSQ20PY1 Service Manual page 340

Troubleshooting (OP: Unified ON/OFF Controller)
Troubleshooting
329
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
YES
Is a malfunction code
displayed on the remote
controller?
NO
Has a once
connected indoor
YES
unit been removed
or its address
changed?
NO
Is the power supply
NO
for the indoor unit
displaying a
malfunction turned
on?
YES
Is transmission wiring YES
disconnected or wired
incorrectly?
NO
Is transmission with
YES
all indoor units
malfunctioning?
NO
Is the transmission
YES
wiring with the master
controller disconnected
or wired incorrectly?
NO
Is the master
controller's connector
YES
for setting master
controller
disconnected.
NO
Is the group No.
NO
of malfunctioning
indoor units set?
YES
SiBE31-801_C
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.
Set the group No.
correctly.
Replace the central PCB.
Fix the wiring correctly.
Connect the connector
correctly.
Replace the central PCB.
Troubleshooting