Service manual

SiUS28-902_a Troubleshooting by Indication on the Centralized Remote Controller
Troubleshooting 144
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Is the
power supply turned
on for indoor units displaying
malfunction?
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 P.C.B.
Fix the wiring correctly.
Fix the wiring correctly.
Connect correctly.
Replace the central P.C.B.
Reset power supply
simultaneously for all optional
controllers for centralized
control.
YES
YES
NO
YES
YES
YES
YES
Turn indoor unit's power
supply.
YES
NO
NO
NO
NO
NO
NO
Has
an indoor
unit once
connected been removed
or its address
changed?
Is the group
No. of malfunctioning
indoor units set?
Is transmission
with all indoor units
malfunctioning?