Daikin VRV S RXQ4/5ARV1 - Other Indoor Units and Outdoor Unit Abnormality

Troubleshooting by Error Code SiAF332111E
316 Part 6 Service Diagnosis
5.63 Other Indoor Units and Outdoor Unit Abnormality
Applicable
Models
All indoor unit models
All outdoor unit models
Error Code U9
Method of Error
Detection
Detect the error signal for the other indoor unit within the circuit by outdoor unit main PCB.
Error Decision
Conditions
The error decision is made on any other indoor units within the system concerned.
Supposed
Causes
 Transmission error between other indoor and outdoor units
 Defective electronic expansion valve of other indoor unit
 Defective indoor unit PCB of other indoor unit
 Improper connection of transmission wiring between indoor and outdoor unit
Troubleshooting
U9 has
been displayed for 2
minutes or more.
The outdoor unit main PCB
indicated by the error code U9 is
normal.
Check for the indoor unit of other
system, and then conduct
troubleshooting by diagnosis
according to the Error Code
Flowchart.
Re-diagnose by display after
passage of 2 minutes or more.
NO
Turn ON all indoor units.
YES
YES
Continue the operation.
NO
All the units are
display U9.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.