Other Indoor Units And Outdoor Unit Abnormality - Daikin VRV S RXQ4/5ARV1 Service Manual

Troubleshooting by Error Code

5.63 Other Indoor Units and Outdoor Unit Abnormality

Applicable All indoor unit models
Models All outdoor unit models
U9
Error Code
Method of Error Detect the error signal for the other indoor unit within the circuit by outdoor unit main PCB.
Detection
Error Decision
The error decision is made on any other indoor units within the system concerned.
Conditions
Supposed
 Transmission error between other indoor and outdoor units
Causes  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
316
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn ON all indoor units.
NO
All the units are
display U9.
YES
U9 has
NO
been displayed for 2
minutes or more.
YES
SiAF332111E
Continue the operation.
Re-diagnose by display after
passage of 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.
Part 6 Service Diagnosis