Daikin FXYBP20K7V1, Service Manual

Page: 164 / 193

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