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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
25
Symptom Corrective Action Reference
Heater wire alarm
not working
Non-heater wire mode has been activated, connect a heated
wire circuit or disable this mode via the diagnostic menu.
Section 4.1.2
1. Check that the airway probe is inserted into the breathing
circuit correctly, the breathing circuit assembled correctly,
and that there is water in the chamber.
2. Check that the circuit is connected correctly to the
ventilator – gas flow could be reversed through the
humidifier.
3. Check that the gas flow rate is within specification of the
humidifier and type of accessories being used. Adjust as
necessary.
Section 3.4
4. Check for excessive condensate build up. Excessively
cold or drafty ambient conditions may cause this alarm to
occur. Ensure there are no strong drafts around the
breathing circuit.
5. Complete a probe accuracy check. Replace probe as
necessary.
Section 8.2
Airway Probe
alarm flashes along
with an audible
alarm
6. Humidifier faulty. Replace PCBs.
1. If the Temperature / Flow Probe alarm occurs with
chamber or airway indicators also flashing, the
temperature probe is faulty.
Section 4.4 Temperature / Flow
Probe alarm with
airway or chamber
indicators flashing
2. Complete a probe accuracy check, and replace probe if
required.
Section 8.2
1. Is the probe connector correctly plugged into the
humidifier? Plug in probe as required.
2. Check that the circuit is connected correctly to the
ventilator – gas flow could be reversed through the
humidifier.
3. Perform a humidifier calibration check. Section 8.1.2
4. Replace temperature probe and re-test. If the alarm
condition disappears, the temperature probe is faulty.
Discard faulty probe.
Section 8.2
Temperature probe
connector indicator
flashes,
accompanied by an
audible alarm
5. Humidifier faulty. Replace PCBs. Section 7.2.3
The humidifier has been unable to maintain temperature over a
period of time.
1. Gas flow has been disconnected from the humidifier either
reconnect gas flow or turn the humidifier off.
2. Check that the gas flow rate is within specification of the
humidifier and accessories being used.
3. Check for drafts around the breathing circuit. This can be
caused by fans or room air conditioning. If this is found to
be the cause, the breathing circuit should be shielded from
the ambient airflow.
4. Check that the circuit is connected correctly to the
ventilator – gas flow could be reversed through the
humidifier.
WARNING: Never cover the breathing circuit.
5. Check for excessive condensate pooling in the breathing
circuit. Drain circuit if necessary.
6. Humidifier or probe faulty? Complete humidifier & probe
performance test. Replace probe or service humidifier as
required.
Section 8
Temperature
Indicator flashes,
with audible alarm,
coupled with a low
temperature
(< 35.5 °C)
displayed
7. Check that there is sufficient water in the chamber. Refill
as necessary. Check that the water bag and delivery tube
are not occluded.