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Technical specifications
The delivered airflow is not humid/heated although the H4i humidifier is
in use
The humidifier is not properly at
t
ached. Correctly attach the humidifier.
The humidifier does not heat. The device is currently powered by
batt
ery use or not connected to the
mains.
The humidifier does not work. Return the device and the humidifier for
serv
icing.
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 hav
e 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.
Fi
O
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.
FiO
2
sensor is used or defective. If the lifetime of the FiO
2
sensor has
exceeded one year please replace the
FiO
2
sensor and start calibration again.
LCD: is displayed in the header
Battery is not charging.
•
Ensure the ambient temperature
conditions are within the specified
operating range. If the problem persists
within the specified operating conditions
please return the device for servicing.
• Power-off the device. Power-on the
device again.
Operating pressure
ra
n
ge
• IPAP: 2 cm H
2
O to 40 cm H
2
O (in S, ST, T, PAC mode)
• PS: 0 cm H
2
O to 38 cm H
2
O (in S, ST, T, PAC mode)
• EPAP: 2 cm H
2
O to 25 cm H
2
O (in S, ST, T, iVAPS, PAC
mode)
• CPAP: 4 cm H
2
O to 20 cm H
2
O (in CPAP mode only)
• Min PS: 0 cm H
2
O to 20 cm H
2
O (in iVAPS mode)
• Max PS: 0 cm H
2
O to 30 cm H
2
O (in iVAPS mode)
Note: iVAPS mode is only available in Stellar 150.
Maximum single fault
pr
essure
60 cm H
2
O (in all modes)
Breathing resistance
under s
ingle fault
2 cm H
2
O at 30 L/min;
7. 2 c m H
2
O at 60 L/min
Maximum flow > 200 L/min at 20 cm H
2
O
Flow accuracy ± 6 L/min or 20% measured value, whichever is greater
Test condition: T mode, IPAP: 40 cm H
2
O, EPAP:
2 cm H
2
O, Rise Time: MIN, Fall Time: MIN, Ti: 4.0 sec,
Respiratory Rate: 10 bpm, with ResMed calibration cap.
Problem / possible cause Solution