Malfunction Of Transmission Between Indoor And Outdoor Units In The Same System - Daikin VRV R-407C PLUS Series Service Manual

SiE 00-07
3.31 Malfunction of Transmission Between Indoor and Outdoor Units in the Same
System
U9
Remote Controller
Display
Supposed Causes
Troubleshooting
Troubleshooting R-407C PLUS Series
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
"U9"
has been displayed for 2
minutes or more.
NO
Turn on all indoor units.
NO
The "UA"
display blinks on the
remote controllers of other
units within the same
refrigerant
system.
NO
The "A1"
display blinks on
the remote controllers of other
units within the same
refrigerant
system.
NO
The "A9"
display blinks on
the remote controllers of other
units within the same
refrigerant
system.
NO
The "U4"
display blinks on
the remote controllers of other
units within the same
refrigerant
system.
NO
YES
YES
YES
YES
YES
Troubleshooting
Re-diagnose by display after passage
of 2 minutes or more.
Refer to failure diagnosis for "UA"
malfunction code.
Refer to failure diagnosis for "A1"
malfunction code.
Refer to failure diagnosis for "A9"
malfunction code.
Refer to failure diagnosis for "U4"
malfunction code.
Refer to failure diagnosis for "U5"
malfunction code.
(VF058)
153