Malfunction Of Transmission Between Indoor And Outdoor Units In The Same System - Panasonic Urban Multi MX1R Series Service Manual

Troubleshooting
3.31 Malfunction of Transmission Between Indoor and Outdoor Units in the Same
System
U9
Remote Controller
Display
„ Malfunction of transmission between indoor and outdoor of other system
Supposed Causes
„ 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
528
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
"U9"
has been displayed for 2
minutes or more.
NO
Turn on all indoor units.
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 UM Combination "MA1R Series" Using R-407C
PACD011001C2
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)