Panasonic U-72MF1U9 Installation Instructions Manual page 52

Alarm messages displayed on system controller
Serial Error in transmitting serial
communication communication signal
errors
Mis-setting
Error in receiving serial
communication signal
Activation of Protective device of sub indoor
protective device unit in group control is activated.
NOTE
1. Alarm messages in << >> do not affect other indoor unit operations.
2. Alarm messages in < > sometimes affect other indoor unit operations depending on the fault.
Indoor or main outdoor unit is not operating correctly.
Mis-wiring of control wiring between indoor unit, main outdoor unit and
system controller.
Indoor or main outdoor unit is not operating correctly.
Mis-wiring of control wiring between indoor unit, main outdoor unit and
system controller.
CN1 is not connected properly.
When using wireless remote controller or system controller, in order to
check the alarm message in detail, connect wired remote controller to
indoor unit temporarily.
52
C05
C06
P30