5-4 
Key Error  M  The key was pressed and 
held for more than five 
seconds.  
1. Check the pop-up status of the 
key and the keyboard.   
2. If the problem persists, replace 
the keyboard.   
Device Fault, 
Ventilate 
Manually 
H  Both the valve and sensor 
are faulty. 
1. Troubleshoot the valve and 
sensor respectively. 
2. Refer to the alarms related to 
valve and sensor to eliminate the 
alarm. 
Ventilator 
Hardware Error 
01 to 09 
H  Monitor board selftest error Replace the monitor board. 
Ventilator 
Hardware Error 
11 
H  Safety valve control failure 
by the auxiliary control 
board  
Ventilator 
Hardware Error 
12 
H  Safety valve control failure 
by the main control board 
1. Perform leak test again. 
2. Check if the PEEP valve works 
normally. Restart the machine.   
(This fault occurs only when leak 
test is being carried out). 
Auxi Ctrl Module 
Error 
H  During leak test and 
zeroing, a failure occurred 
during the interaction 
between the auxiliary 
control board and the 
monitor board.   
1. Restart the machine.   
2. Perform leak test. 
3. Perform manual zeroing. 
4. Replace the monitor board. 
Ventilator Comm 
Error 
H The ventilator module 
failed to communicate 
normally with the main 
system. 
Ventilator Comm 
Stop 
H The ventilator module 
failed to communicate with 
the main system. 
1. Re-plug or replace the 
communication cable between the 
main control board and the monitor 
board. 
2. If the problem persists, replace 
the monitor board.   
3. If the problem persists, replace 
the main control board. 
Drive Gas 
Pressure Low   
H  The pressure of drive gas 
was low. 
1. Check the status of actual gas 
supply to confirm if the alarm is in 
compliance with the actual status. 
2. Short circuit the pressure switch 
and the alarm regarding outputted 
signals should disappear. 
Otherwise, it indicates that the 
pressure switch is faulty. Replace 
the pressure switch. Otherwise, 
check the connection between the