7-32 
3. If the problem persists, replace the 
auxiliary O2/air module (refer to 11.1.4). 
Calibrate Aux 
O2/AIR Module 
Low 
the proportional valve or 
sensor has no data or has 
1. Restart the auxiliary O2/air module. 
2. If the problem persists, replace the 
auxiliary O2/air module (refer to 11.1.4). 
 
7.3.9 HFNC Module Runtime Alarms 
HFNC Module 
Comm Stop 
High 
The communication 
between the CPU board 
and the HFNC module 
stops. 
The CPU board lost 
communication with the 
HFNC module for 10s. 
1. Restart the HFNC module. 
2. If the status screen has a 
communication stop alarm, or encounters 
the black or blank screen error, rectify 
the fault of the status screen first (refer to 
7.2.1). 
3. If the problem persists, remove the 
auxiliary electrical outlet (refer to 8.1.2) 
and service door (refer to 8.1.1), 
reconnect the cable between the auxiliary 
O2/air module and the backplane 
(backplane socket position: "O2Air" 
socket on the right). 
4. If the problem persists, replace the 
HFNC module (refer to 11.1.4). 
HFNC Module 
Failure 
Med 
faulty. 
2. The branch switch 
1. Restart the HFNC module. 
2. If the problem persists, replace the 
HFNC module (refer to 11.1.4). 
HFNC Selftest 
Error 
Med 
1. A module self-test 
error occurs. 
2. A proportional valve 
self-test error occurs. 
3. A power-on zeroing 
error or zero point 
reading error occurs. 
1. Restart the HFNC module and main 
unit. 
2. If the problem persists, remove the 
auxiliary electrical outlet (refer to 8.1.2) 
and service door (refer to 8.1.1), 
reconnect the cable between the auxiliary 
O2/air module and the backplane 
(backplane socket position: "O2Air" 
socket on the right). 
3. If the problem persists, replace the 
HFNC module (refer to 11.1.4). 
Calibrate HFNC 
Module 
Low 
the proportional valve or 
sensor has no data or has 
1. Restart the HFNC module. 
2. If the problem persists, replace the 
HFNC module (refer to 11.1.4). 
 
7.3.10 External AG Module Runtime Alarms 
AG Hardware 
Error 
Med 
The AG hardware 
malfunctions. 
1. Re-plug the AG module, or replace the 
slot. 
2. If the problem persists or the alarm 
occurs repeatedly, replace the AG