Transmission Error (Between Indoor And Outdoor Units In The Same System) - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

SiBE341027
2.37 Transmission Error (between Indoor and Outdoor Units
in the Same System)
U9
Remote
Controller
Display
Applicable All models of indoor unit
RQYQ-PY1B
Models
Method of Error Detect error signal for the other indoor units within the circuit by outside unit PCB.
Detection
Error Decision When the error decision is made on any other indoor unit within the system concerned.
Conditions
Supposed
Causes
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Turn on all indoor units.
minutes or more.
Service Diagnosis
Transmission error within or outside of other system
Defective electronic expansion valve in indoor unit of other system
Defective PCB of indoor unit in other system
Improper connection of transmission wiring between indoor and outdoor unit
All the units are
NO
U9
indicating " ".
YES
U9
" " has been
NO
displayed for 2
YES
Troubleshooting by Remote Controller
Continue the operation.
Re-diagnose by display after passage
of 2 minutes or more.
The outdoor unit PCB indicated by the
U9
error code is normal.
Check for the indoor unit of other
system, and then conduct
troubleshooting by diagnosis
according to the Error Code
Flowchart.
167