Appendix A Alert and Maintenance INFO List A-16 
 
A.5 Maintenance INFO 
The list of Maintenance INFO message is shown below. 
 
Message Explanation  Advice 
Air Pressure(invalid) 
There is a format error or 
a status error of the data. 
Check the sensor condition. 
Air Pressure(not 
plausible) 
There is a range error of 
the data. 
Check the sensor condition. 
Air 
Pressure(unavailable) 
The data cannot be 
received. 
Check the condition of the sensor and the 
communication path. 
Air TEMP(invalid) 
There is a format error or 
a status error of the data. 
Check the sensor condition. 
Air TEMP(not plausible) 
There is a range error of 
the data. 
Check the sensor condition. 
Air TEMP(unavailable) 
The data cannot be 
received. 
Check the condition of the sensor and the 
communication path. 
AIS(Communication 
failed, Direct) 
Communication with AIS 
cannot be performed via 
Serial. 
Check the condition of AIS and Serial.   
If it cannot be recovered after you check the 
connection of the equipment cable in 
power-off status and restart, turn off the 
power of the device and contact your 
distributor. 
AIS(Communication 
failed, Main LAN) 
Communication with AIS 
cannot be performed via 
Main LAN. 
Check the condition of AIS and Main LAN.   
If it cannot be recovered after you check the 
connection of the equipment cable in 
power-off status and restart, turn off the 
power of the device and contact your 
distributor. 
AIS(Communication 
failed, Sub LAN) 
Communication with AIS 
cannot be performed via 
Sub LAN. 
Check the condition of AIS and Sub LAN.   
If it cannot be recovered after you check the 
connection of the equipment cable in 
power-off status and restart, turn off the 
power of the device and contact your 
distributor. 
ALC #n(Communication 
failed, Main LAN) 
Communication with ALC 
#n cannot be performed 
via Main LAN. 
Check the condition of ALC #n and Main LAN. 
If it cannot be recovered after you check the 
connection of the equipment cable in 
power-off status and restart, turn off the 
power of the device and contact your 
distributor. 
ALC #n(Communication 
failed, Sub LAN) 
Communication with ALC 
#n cannot be performed 
via Sub LAN. 
Check the condition of ALC #n and Sub LAN.   
If it cannot be recovered after you check the 
connection of the equipment cable in 
power-off status and restart, turn off the 
power of the device and contact your 
distributor.