Alarms and Troubleshooting
3-4 User Manual
DMR V4C 3.3 (User Manual) V-4 06-May-2022
Target FiO
2
cannot be reached (too high)
OR
High FiO
2
alarm
OR
FiO
2
reads >100%
High oxygen delivery to patient.
Incorrect calibration of oxygen sensor.
Accuracy of FiO
2
sensor.
Incorrect connection(s) between
Oxygen Mixer and ventilator (electrical or
gas).
Leak in gas pathway.
Wait 10 breaths for the FiO
2
stabilize.
Turn FiO
2
adjustment knob to the left
and note if the FiO
2
changes. Do not
attempt to turn the knob past the point
where resistance is felt. If the knob is
unresponsive see troubleshooting for
"FiO
2
Knob unresponsive".
Recalibrate the FiO
2
sensor. See calibra-
tion steps in Section 5.1, FiO
2
Sensor Cal-
ibration.
Ensure the oxygen cell has not expired.
Ensure nothing is blocking the air intake
port of the Oxygen Mixer.
Confirm that no oxygen is being deliv-
ered to the low pressure oxygen inlet of
the compatible ventilator. Delivering
oxygen directly to the ventilator while
using the V4C-O2E Oxygen Mixer will
impact FiO
2
percentage delivered to the
patient.
If fault doesn't clear, discontinue use of
the V4C-O2E Oxygen Mixer. Contact your
customer service representative for assis-
tance.
High PEEP / High Pressure Internal technical fault. Follow all troubleshooting steps on the
compatible ventilator.
Discontinue use of the V4C-O2E Oxygen
Mixer and contact your customer service
representative for assistance.
Table3-1.V4C-O2E Oxygen Mixer troubleshooting
Alarm Message or Symptom Possible Reason for the Event Corrective Action
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