Panasonic U-72MF1U9 Service Manual page 20

6. Meaning of Alarm Messages
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 unit in group control is activated
device
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.
1
2
3
4
5
6
7
Indoor or main outdoor unit is not oparating 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.
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Test Run
C05
C06
P30