U9" Malfunction Of Transmission Between Indoor Units And Outdoor Units In The Same System - Daikin VRV III-S RXYMQ36 48PVJU Service Manual

Troubleshooting by Indication on the Remote Controller
U9
3.42 " " Malfunction of Transmission between Indoor Units
and Outdoor Units in the Same System
U9
Remote
Controller
Display
Applicable
All indoor unit models
Models
Method of Detect malfunction signal for the other indoor units within the circuit by outdoor unit PCB.
Malfunction
Detection
Malfunction
When the malfunction decision is made on any other indoor unit within the system.
Decision
Conditions
 Malfunction of transmission between indoor and outdoor unit
Supposed
 Malfunction of electronic expansion valve in indoor unit of other system
Causes
 Defect of PCB of indoor unit in other system
 Improper connection of transmission wiring between indoor and outdoor unit
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting the connector, or parts may be damaged.
Turn on all indoor units.
has been displayed for 2
186
All the units are
NO
U9
indicating " ".
YES
U9
" "
NO
minutes or more.
YES
Continue operation.
Re-diagnose by display after
passage of 2 minutes or more.
The indoor unit PCB indicated
U9 is
by the malfunction code
normal.
Check for the indoor unit of
other system, and then conduct
troubleshooting by diagnosis
according to the malfunction
code flowchart.
Troubleshooting
SiUS34-907