Daikin VRV II REYQ8MY1B, Service Manual

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Troubleshooting (OP: Centralized Remote Controller) Si39-306
214 Troubleshooting
3. Troubleshooting (OP: Centralized Remote Controller)
3.1
“
UE
”
Malfunction of Transmission between Centralized
Remote Controller and Indoor Unit
Remote
Controller
Display
UE
Applicable
Models All models of indoor units
REYQ8~48M
Method of
Malfunction
Detection Microcomputer checks if transmission between indoor unit and centralized remote controller is
normal.
Malfunction
Decision
Conditions When transmission is not carried out normally for a certain amount of time
Supposed
Causes
„
Malfunction of transmission between optional controllers for centralized control and indoor unit
„
Connector for setting master controller is disconnected.
„
Failure of PC board for centralized remote controller
„
Defect of indoor unit PC board
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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 PC
board.
Fix the wiring correctly.
Fix the wiring correctly.
Connect the connector
correctly.
Replace the central PC board.
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 remove
or its address
changed?
Is the group
No. of malfunctioning
indoor units set?
Is transmission
with all indoor units
malfunctioning?
(V2832)