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