U9 " Indoor Unit: Malfunction Of Transmission Between Indoor And Outdoor Units In The Same System - Daikin RQYQ140-180PY1 Service Manual

Troubleshooting by Remote Controller
U9
2.36 " " Indoor Unit: Malfunction of Transmission between
Indoor and Outdoor Units in the Same System
U9
Remote
Controller
Display
Applicable All indoor unit models
RQYQ-PY1
Models
RQEQ-PY1
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 concerned.
Decision
Conditions
Supposed
Causes
Troubleshooting
173
Malfunction of transmission within or outside of other system
Malfunction of electronic expansion valve in indoor unit of other system
Defect of PCB 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.
All the units are
U9
indicating " ".
YES
U9
" " has been
displayed for 2
minutes or more.
YES
NO
NO
SiBE341001
Continue operation.
Re-diagnose by display after
passage of 2 minutes or more.
The outdoor unit PCB indicated by
U9
the malfunction code is normal.
Check for the indoor unit of other
system, and then conduct
troubleshooting by diagnosis
according to the Malfunction Code
Flowchart.
Troubleshooting