fisher--paykel mr850 Manual De Usuario

 

MR850 Technical Manual   *   Revision J   * Issued November 2005   *   Ref.  185041340 (185041713 internal)

 

26 

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 

 

Problems that cause the humidifier to malfunction without an audible alarm are discussed in this 
section. 
 

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