Filter
Top Products
50
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
APPENDIX C __________________________________________________
C1 TROUBLESHOOTING GUIDE FOR THE MR700 SERIES RESPIRATORY HUMIDIFIERS
This is a guide to possible corrective action in the case of an humidifier alarm condition or malfunction. It is primarily
written for humidifiers using heated wire mode. So parts of this guide would not be applicable for the MR480 and MR730
and MR720 in the heater wire off mode.
Unless the cause and immediate effects of an alarm condition are understood and assessed to be of no hazard to the
patient, the humidifier should be immediately switched off and removed from the patient circuit.
C1.1 LOW TEMPERATURE
Condition detected Possible cause F Action to take
Temperature less than desired,
no alarm.
Humidifier warming up. Wait for a few minutes.
Standby mode switched on. Push mode button for 1 second to
disable standby. Wait 20 minutes (30
minutes for v3.0 software).
Temperature probe not in position. Check position of temperature probe in
the circuit.
Airway temperature low alarm
activated.
Gas flow stopped or interrupted. Enter standby mode or turn humidifier
off until gas flow resumed. (Gas flow
must be resumed before coming out of
standby mode).
Set temperature increased by more than
2 °C.
Wait for temperature to rise.
Temperature probe not in probe
housing.
Fit temperature probe.
Gas flow rate too low. Increase gas flow to more than 2 litres
per minute.
Too much distance between end of
heater wire and temperature probe.
Use longer heater wire or shorten
inspiratory hose so that distance is
between 25 (1") and 100 mm (4"), ideally
30 mm.
Chamber temperature low alarm
activated.
Poor thermal contact between base of
chamber and heaterplate.
Check that chamber base and heaterplate
are clean, smooth and flat. If necessary
clean or replace. Humidification
chambers which are not manufactured by
Fisher & Paykel may not be suitable.
Temperature probe not inserted at
chamber outlet.
Fit temperature probe correctly.
Heater element needs replacement. Send for repair.
Gas flow rate too high for chamber Use correct chamber. Refer to the
operating instructions for the type of
chamber used.