D-1 
D Alarm Messages 
 
This chapter lists physiological and technical alarm messages. 
Note that in this chapter: 
  Column P stands for the default alarm level: H for high, M for medium and L for 
low. 
  For each alarm message, corresponding actions are given instructing you to 
troubleshoot problems. If the problem persists, contact your service personnel. 
D.1 Physiological Alarm Messages 
Source  Alarm message  P  Cause and action 
Ventilator 
parameters 
Paw Too High  H 
The airway pressure exceeds the set pressure high alarm 
limit. 
1. Check the patient. 
2. Check the ventilation parameter setup. 
3. Check the alarm limits. 
4. Check the patient tubing for occlusion. 
FiO
2
 Too High  H 
The inspired O
2
 concentration is greater than the FiO
2
 high 
alarm limit for at least 30s. 
1. Check the ventilation parameter setup. 
2. Check the alarm limits. 
3. Check the HEPA filter for occlusion. 
4. Calibrate the O
2
 sensor. 
FiO
2
 Too Low  H 
The inspired O
2
 concentration is less than the FiO
2
 low 
alarm limit for at least 30s or is less than 18 %. 
1. Check the ventilation parameter setup. 
2. Check the alarm limits. 
3. Check the O
2
 supply. 
4. Calibrate the O
2
 sensor. 
O
2
% Too High  H 
During O
2
 therapy, the O
2
 concentration is greater than the 
O
2
% high alarm limit for at least 30s. 
1. Check the ventilation parameter setup. 
2. Check the alarm limits. 
3. Check the O
2
 supply. 
4. Calibrate the O
2
 sensor. 
O
2
% Too Low  H 
During O
2
 therapy, the O
2
 concentration is less than the 
O
2
% low alarm limit for at least 30s or is less than 18 %. 
1. Check the ventilation parameter setup. 
2. Check the O
2
 supply. 
3. Calibrate the O
2
 sensor.