8-4 
Message 
Alarm 
Priority 
Cause  Solution 
and expiratory valve assembly.   
4. When necessary, replace the VCM 
board.  
5. When necessary, replace the 
expiratory valve assembly.. 
6. When necessary, replace the power 
board.  
Insp Valve 
Failure 
Medium 
1. Inspiratory valve voltage 
error2. Inspiratory valve flow 
error 
1. Check whether the accuracy of the 
inspiratory flow sensor is within the 
valid range. On the [Maintenance] 
menu, calibrate the flow sensor. Or, 
when a flow error occurs, replace the 
flow sensor.   
2. Test the voltage at the corresponding 
testing point. 
3. Check the installation of and 
connection between the power cable 
and expiratory valve assembly.   
4. When necessary, replace the VCM 
board.  
5. When necessary, replace the 
expiratory valve assembly.. 
6. When necessary, replace the power 
board.  
Safety Valve 
Failure 
Medium 
PEEP safety valve voltage 
error 
1. Test the voltage at the corresponding 
testing point. 
2. Check the installation of and 
connection between the power cable 
and expiratory valve assembly.   
3. When necessary, replace the VCM 
board.  
4. When necessary, replace the 
expiratory valve assembly. 
5. When necessary, replace the power 
board.  
Flow Sensor 
Failure 
Low 
The ventilator flow is out of 
range. 
1. Check whether the zero point of the 
flow sensor is within the valid range.   
2. Check whether the monitored value 
of the flow sensor is within the valid 
range.  
3. Replace the flow sensor and perform