Daikin Aurora Series, Service Manual

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SiUS341802E Troubleshooting by Error Code
Service Diagnosis 278
2.68 Transmission Error between Centralized Control
Equipment and Indoor Unit
Error Code
UE
Applicable
Models All indoor unit models Schedule timer
Central remote controller
Method of Error
Detection Microcomputer checks if transmission between indoor unit and centralized control equipment is
normal.
Error Decision
Conditions
When transmission is not carried out normally for a certain amount of time
Supposed
Causes
„
Transmission error between optional controllers for centralized control equipment and indoor
unit
„
Connector for setting main controller is disconnected.
(or disconnection of connector for independent / combined use changeover switch.)
„
Defective PCB for central remote controller
„
Defective indoor unit PCB
Troubleshooting
Is the
power supply of
the indoor unit, on which
the UE occurred,
turned ON?
For
VRV systems,
can the setting of
central control group No. be
made in one and the
same refrigerant
system?
Has
the setting of
central control group
No. been made with the
indoor unit on which the
UE occurred?
Can the
setting of central
control group No be
made?
Check
the indoor
unit for which UE
is displayed. Is the
transmission error UE
caused on all
indoor units?
Was the
central control
group No. for indoor
unit changed?
Make correct setting of the
central control group No.
Check outdoor units to which
the refrigerant system is
connected.
Check whether or not there
are no problems with the
transmission wiring length,
types of cables and wires,
number of units connected,
and others. If no problems,
replace the indoor unit PCB.
NO
YES
YES
Go to the next page.
NO
NO
YES
Make sure there are no
hazardous situations, and
then turn ON the power
supply.
NO
NO
YES
YES
NO
YES
Reset the power supplies of
every centralized control
equipment.
For the intelligent Touch
controller, register the air
conditioner again while in
DIII-NET test run menu.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
A