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20. Troubleshooting Chart
20.1 Ventilation Related Problems
Warning: In all alarm conditions check
the patient first.
Symptom Possible Cause Remedy
Tidal volume maintained
despite low PIP.
Flow sensor incorrectly calibrated. Calibrate flow sensor.
Blocked Fresh Gas
alarm.
Alarm Message:
Blocked Fresh Gas.
Fresh gas supply tube blocked or
kinked.
Check the fresh gas supply line and
rest of the patient circuit.
Leaking Fresh Gas
alarm.
Alarm Message:
Leaking Fresh Gas.
Patient circuit leaking fresh gas. Check the fresh gas supply line and
rest of the patient circuit plus water
trap.
Continuing positive
pressure alarm.
Alarm Message:
Continuing positive
pressure.
Constriction of proximal airway line. Remove constriction.
High pressure alarm.
Alarm Message:
High Pressure.
Waveform has crossed high pressure
alarm threshold.
Check ventilator pressures.
Check the patient circuit.
Adjust alarm threshold.
Failure to cycle alarm.
(No flow sensor fitted)
Alarm Message:
Cycle Fail.
Waveform has crossed cycle fail alarm
threshold.
Check ventilator pressures.
Check the patient circuit and water
trap.
Adjust alarm threshold
Low pressure alarm.
Alarm Message:
Low Pressure.
Waveform has crossed low pressure
alarm threshold.
Check ventilator pressures.
Check the patient circuit and water
trap.
Adjust alarm threshold.
Unexpected rise in mean
P alarm.
Alarm Message:
Unexpected Rise in
mean P.
The mean pressure has increased by
more than 5mbar.
Check ventilator pressures.
Check the patient circuit.
Press autoset to for new alarm
thresholds.
Unexpected drop in
mean P alarm.
Alarm Message:
Unexpected Drop in
Mean P.
The mean pressure has decreased by
more than 5mbar.
Check ventilator pressures.
Check the patient circuit and water
trap.
Press autoset to for new alarm
thresholds.
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