Air
Life
®
nCPAP Driver Service Manual
2008, Cardinal Health
Page 73 of 81
Warning Screen
Description
Possible Fault
Suggested Action
Pressure is elevated in
the patient circuit during
start-up
Disconnect the proximal
pressure line from the
Device’s receptacle to
ensure pressure is not
trapped and cycle power to
the device.
Indicates that the patient
pressure sensor failed the
zero point calibration
during the Power-On Self
Test.
Faulty or defective
patient pressure sensor
Service or replace the
Outlet Fitting Assembly
Source Valve and
Delivery Valve failure.
Service and/or replace the
Manifold Assembly.
Indicates that the flow
sensor failed the zero
point calibration during the
Power-On Self Test.
Faulty or defective flow
sensor
Service or replace the
Outlet Fitting Assembly.
Perform PM service to inlet
filter screens, air inlet filter
bowl media, and O
2
sensor
filters
Service or replace the
Manifold Assembly
Check for occluded Oxygen
Sensor Bleed Port
Insufficient bleed flow
(<0.9 lpm at 50 psig)
Check for clogged inlet filter
screens
Indicates that the 2-point
O
2
sensor calibration
criteria are not met
Faulty or defective O
2
sensor
Service or replace the
Divider/Oxygen Sensor
Assembly
Patient Treatment Mode Warning Screens
Running on DC power
longer than the
specified duration of 4
hours
Apply AC power to the
device and allow the
battery to charge for a
minimum of 16 hours for a
full charge
Indicates that the battery
power level is below the
minimum required to
reliably operate the device
Battery has exceeded
its useful life
Replace the Battery
Assembly
Indicates that a fatal
software fault has been
detected by the device
Software fault or
detection of a fault
condition based on
watchdog criteria that
may adversely affect
the operation of the
device
Remove device from
service. Note displayed
code and re-install the
latest revision of software
