Panasonic CU-8ME1XPK - Malfunction of Transmission between Indoor and Outdoor Units in the same System

Troubleshooting PACD011001C2
528 Troubleshooting UM Combination “MA1R Series” Using R-407C
3.31 Malfunction of Transmission Between Indoor and Outdoor Units in the Same
System
Remote Controller
Display
U9
Supposed Causes
„
Malfunction of transmission between indoor and outdoor 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.
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.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.