U9" Indoor Unit: Malfunction Of Transmission Between Indoor; And Outdoor Units In The Same System; Outdoor Units In The Same System - Daikin VRV III RXYQ5-54PY1 Service Manual

Si34-601A
3.48 "U9" Indoor Unit:
Indoor and Outdoor Units in the Same System
U9
Remote
Controller
Display
Applicable All models of indoor units
Models
Method of Detect the malfunction signal of any other indoor unit within the system concerned.
Malfunction
Detection
Malfunction When the malfunction decision is made on any other indoor unit within the system concerned.
Decision
Conditions
Supposed
Causes
Troubleshooting
Troubleshooting
Malfunction of Transmission Between
Malfunction of transmission within or outside of other system
Malfunction of electronic expansion valve in indoor unit of other system
Defect of PC board of indoor unit in other system
Improper connection of transmission wiring between indoor and outdoor unit
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Turn on all indoor units.
"U9"
has been displayed for 2
minutes or more.
YES
Troubleshooting by Indication on the Remote Controller
NO
Re-diagnose by display after
passage of 2 minutes or more.
The outdoor unit PC board
indicated by the malfunction code
U9 is normal.
Check for the indoor unit of other
system, and then conduct
troubleshooting by diagnosis
according to the Malfunction
Code Flowchart.
287