22 Troubleshooting
6.2 Remedies
Fault Cause Localisation Remedy
No motor noises,
power indicator does
not light up, mains
failure alarm sounds.
No power.
Check mains lead for
secure connection.
If applicable, check
whether power is available
at the mains (e.g. with a
lamp).
Faulty fuse.
Replace fuse 39 (see "5.3.4
Checking the fuse" on
page 11).
A spare fuse can be found
in the fuse box.
Power indicator fails to
illuminate, no acoustic
alarm.
Capacitor for mains
failure alarm is
completely
discharged.
Leave the appliance to run
for 5 minutes.
No flow at nasal
cannula, although
there is flow at the
appliance outlet. In
such cases, the
appliance does not
emit an alarm.
Tube connections
interrupted.
Disconnect tube from inlet of
dosage monitor; check
whether flow is escaping
from the tube.
Seal all connection and
sealing points from the
appliance outlet to the inlet
of the dosage monitor.
Oxygen distributor in
bubble humidifier
blocked.
Loosen union nut of bubble
humidifier; the ball should
then rise.
Clean or replace the
oxygen distributor.
After running for a
long period,
appliance emits
intermittent acoustic
warnings and red fault
indicator flashes;
no flow.
Motor compressor not
rotating.
Capacitor incorrectly
connected or not connected
at all. Connect the
capacitor correctly
(7.5, page 30).
Check the voltage supply at
the motor. Motor defective:
Replace the compressor
(7.5, page 30).
Crank mechanism stiff,
motor circuit-breaker of
compressor is
activated.
Compressor defective:
Replace compressor
(7.5, page 30).
After running for a
long period,
appliance emits
intermittent acoustic
warnings and red fault
indicator flashes.
Appliance too hot,
coarse dust filter
blocked.
Clean or replace coarse
dust filter.
(3.2, page 8).
Leak at compressor
outlet port elbow
connector
Replace parts (7.5,
page 30)
Suction filter blocked.
Replace suction filter.
(3.2, page 8).
Overtemperature of
60 °C ± 2.5 °C.
Check fan
(7.10, page 42).
Power cord damaged. Replace power cord.
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