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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
26
Symptom Corrective Action Reference
1. Make sure the humidifier has had time to warm up and that
there is sufficient gas flow through the breathing circuit.
2. The humidifier cannot maintain temperature. If the
temperature indicator is also on then an alarm will occur
eventually.
Section 4.5
A low temperature
is shown on the
humidifier’s
display, with no
audible alarm
3. Humidifier or probe faulty. Complete humidifier and probe
performance test. Replace probe or service humidifier as
required.
Section 8
1. Flow has recently been changed, allow 30 minutes for
temperature to stabilise
High displayed
temperature, no
temperature alarm
2. Manual or automatic humidity compensation is active Section 4.1.5
Temperature
indicator flashes,
with audible alarm,
and a high
temperature is
shown.
The gas flow rate may have suddenly changed. Monitor
the displayed temperature, if the temperature does not fall
rapidly then remove humidifier from patient, and complete a
performance test on the humidifier, and temperature / flow
probe. Replace probe or service humidifier as required.
Section 8
6.2 Technical Problems
Problems that cause the humidifier to malfunction without an audible alarm are discussed in this
section.
Symptom Corrective Action Reference
1. Check that the mains supply is within specification.
Provide adequate mains supply if required.
2. If ‘PtS’ is displayed. Section 6.1
See manual
indicator lit (not
flashing)
3. Replace PCBs. Section 7.2.3
1. Humidifier plugged into mains supply?
2. Check that the mains supply is within specification.
Provide adequate mains supply if required.
3. Remove mains power and check the fuses. Section 7.2.2
4. Check continuity of mains power cord. Replace as
necessary.
Section 7.2.7
5. Check the transformer windings are not open circuit.
Primary Winding: Red wires
Secondary 10v winding: White wires
Secondary 22v winding: Yellow wires
If any windings are open circuit, replace the transformer.
Section 7.2.4
Humidifier will not
turn on with on/off
button, and no
indicators are lit
6. Replace PCBs. Section 7.2.3
Unit fails
calibration check
Send unit to a Fisher & Paykel Healthcare service
representative for calibration, or replace PCBs.
Section 7.2.3
Probe fails Probe
Accuracy Check
Replace probe.
1. If the chamber outlet temperature was low, the heater plate
element should be checked. Replace element as
necessary.
Section 7.2.5
2. If the airway temperature was low, replace breathing circuit
and re-test.
Unit fails to reach
temperature in
humidifier control
check. (Section
8.1.4)
3. Replace PCBs. Section 7.2.3