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There is a large impedance (eg,
antibacterial filter) in the air circuit.
Perform the Learn Circuit function.
The device does not stop when you remove your mask
SmartStart/Stop is disabled. Consult your clinician.
Use of a full face mask or tracheostomy
t
ube.
SmartStart is disabled if Full face mask or
Trach is selected as interface.
Incompatible accessories (eg, humidifier
or m
ask system) with high resistance
being used.
Use only equipment as recommended
and su
pplied by ResMed.
High Leak Alarm or Low Min Vent alarms
ar
e set to ON.
Consult your clinician.
“Confirm
Stop” is enabled. Consult your clinician.
High Leak Alarm is enabled, but alarm does not activate when the mask
is
removed during treatment
Incompatible air delivery system being
use
d.
Use only equipment as recommended
and supplied by ResMed.
Pressure settings are too lo
w for the air
delivery components being used.
Perform the Learn Circuit function to
adjust the therapy pressure according to
your air tubing system.
Learn Circuit failed
• The circuit configuration is
inapp
ropriate as the impedance
detected is too high.
• Too many components have been
included or the
impedance of
accessories in use is above ResMed’s
recommendation, eg, type of filter,
external humidifier, air tubing.
Review the components included in the
circuit configuration
and adjust as
appropriate, then rerun Learn Circuit (see
“Setup menu” on page 16).
The delivered airflow is not humid/heated
although the H4i humidifier is
in use
The humidifier is not properly at
tached. Correctly attach the humidifier.
The humidifier does not heat. The device is currently powered by
bat
tery use or not connected to the
mains.
The humidifier does not work. Return the device and the humidifier for
ser
vicing.
The water chamber is empty. Fill the water chamber of the humidifier.
USB stick is not readable or writeable
The USB stick contains unreadable data,
does not ha
ve enough space available, is
not compatible with the device.
Consult your clinician.
USB stick is defective. Replace the USB stick after consulting
y
our clinician.
FiO
2
sensor calibration failure
FiO
2
sensor is not attached properly. For the correct attachment of the FiO
2
sensor, see “Using the FiO2 monitoring
sensor” on page 8
.
Problem / possible cause Solution