Transmission Error Between Indoor And Condensing Units In The Same System; Transmission Error Between Indoor And Condensing Units In The Same Sys- Tem - Daikin VRV-WIII RWEYQ72PTJU Service Manual

SiUS30-1301
3.45 Transmission Error between Indoor and Condensing Units
in the Same System
U9
Error Code
Applicable All indoor models
Models RWEYQ72P, 84P
Method of Error
Detect the error signal for the other indoor units within the circuit by condensing unit PCB.
Detection
Error Decision When the error decision is made on any other indoor unit within the system concerned.
Conditions
 Transmission error within or condensing of other system
Supposed
 Defective electronic expansion valve in indoor unit of other system
Causes
 Defective indoor unit PCB in other system
 Improper connection of transmission wiring between indoor and condensing unit
Troubleshooting
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Turn ON all indoor units.
All the units are
U9
indicating " ".
YES
U9
" " has been
displayed for 2 minutes or
more.
YES
Troubleshooting by Indication on the Remote Controller
NO
NO
Continue the operation.
Re-diagnose by display after
passage of 2 minutes or
more.
The condensing unit 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.
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