Troubleshooting Overview
User Manual 3-3
DMR V4C 3.3 (User Manual) V-4 06-May-2022
Table3-1.V4C-O2E Oxygen Mixer troubleshooting
Alarm Message or Symptom Possible Reason for the Event Corrective Action
Target FiO
2
cannot be reached (too low)
OR
Low FiO
2
alarm
OR
Loss of oxygen
Low oxygen delivery to the patient.
Incorrect calibration of oxygen sensor.
Accuracy of FiO
2
sensor.
Air ingress in gas pathway.
Incorrect gas connection(s) between
Oxygen Mixer and ventilator.
Incorrect electrical connection(s)
between Oxygen Mixer and ventilator.
Fault in oxygen supply.
Ventilator fault, stall, loss of power, or
overheat.
Wait 10 breaths for the FiO
2
to stabilize.
Check the status of the ventilator. Ensure
it is powered on, ventilating, and there
are no active alarms.
Turn the FiO
2
adjustment knob to the
right 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 the appropriate electrical con-
necting cable is connected.
Ensure the gas connection tube and
oxygen input is connected and there are
no leaks.
Confirm that oxygen supply is delivering
100% oxygen.
Confirm the oxygen supply is delivering
uninterrupted flow to the Oxygen Mixer
at the appropriate pressure and flow rate
(see Section 2.7, Specifications).
Some combinations of breath settings
and patient characteristics may result in
decreased maximum achievable FiO
2
.
See section 2.5, Operating Parameters for
further information.
If fault does not clear, discontinue use of
the V4C-O2E Oxygen Mixer. Contact your
customer service representative for assis-
tance.
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