Hi Flow Stroller Technical Service Manual • PN 14314465 Rev
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Troubleshooting Chart
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Symptom
Probable Cause
Corrective Action
6)
Excessive venting from
relief valves (hissing
sound)
a) The portable has been trans-
ported or laid in an improper
operating position
Return the portable to an upright or acceptable operating posi-
tion and allow several minutes for stabilization.
b) Saturation pressure too high.
Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.
c) Relief valve frozen open
Allow the portable to warm and thaw. Attempt to re-fill the
portable.
d) Faulty relief valve
Test the operating pressure (RP25) and replace the relief valve
if necessary (RP22)
e) Partial or complete loss of vac-
uum
Conduct the NER test (RP28) and return the unit to CAIRE,
Inc. if necessary.
7)
No Flow
a) Portable is empty
Check the contents indicator/level gauge and fill the portable if
needed.
b) Flow control valve turned off
Ensure the flow control knob is not in the off (“0”) position.
c) Nasal cannula kinked or discon-
nected
Ensure proper nasal cannula functionality and positioning
d) Saturation pressure is too low
Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.
e) Leak in the system
Preform a leak check on the plumbing (RP18). Repair leaks as
necessary.
f) Relief valve is open
Ensure that there is no venting from the relief valves. If there is
refer to the corrective actions for “Excessive venting from relief
valves (hissing sound)”
g) Vent valve is open
Ensure that there is no venting from the vent valve outlet/tube.
If there is refer to the corrective actions for “Liquid leaks from
the vent valve tube/outlet”
h) Blockage in the liquid withdrawal
circuit
Check the warming coils and withdrawal tubes for blockages.
Replace if necessary.
i) FCV Faulty
Replace the FCV (RP20)
8)
Low flow at all LPM set-
tings
a) Nasal cannula kinked or leaking Inspect the functionality of the nasal cannula.
b) Saturation pressure is too low
Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.
c) Leak in the system
Preform a leak check on the plumbing (RP18). Repair leaks as
necessary.
d) PRV faulty
Test the operating pressure (RP25) and replace the relief valve
if necessary (RP22).
e) Blockage in the liquid withdrawal
circuit
Check the warming coils and withdrawal tubes for blockages.
Replace if necessary.
f) FCV faulty
Replace the FCV (RP20)
