U9" Indoor Unit; Indoor And Outdoor Units In The Same System - Daikin VRV III REYQ8PY1B Service Manual

Troubleshooting by Indication on the Remote Controller
U9
3.52 " " Indoor Unit:

Indoor and Outdoor Units in the Same System

U9
Remote
Controller
Display
Applicable All models of indoor units
REYQ8P~48P
Models
Method of Detect malfunction signal for the other indoor units within the circuit by outdoor unit PC board.
Malfunction
Detection
Malfunction When the malfunction decision is made on any other indoor unit within the system concerned.
Decision
Conditions
Supposed
Causes
Troubleshooting
344
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.
All the units are
U9
indicating " ".
YES
U9
" "
has been displayed for 2
minutes or more.
YES
NO
NO
SiBE37-701
Continue operation.
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.
Troubleshooting