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Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
Excessive water in expiratory
circuit due to rainout.
Condensation due to cooling in
Expiratory line.
Use dual heated circuit.
Water ejected from
humidification chamber into
circuit.
Humidification chamber filled beyond
maximum water level line.
Rduce water level
Maximum permissible peak flow rate of
humidification chamber has been
exceeded.
Ue correct chamber. Refer to the
operating instructions for the type of
chamber used.
Humidifier chamber tilted. Chamber should be level.
C1.5 LOW HUMIDITY
Condition detected Possible cause FAction to take
Low humidity. Chamber control set to low. Increase setting.
No water in humidification chamber. Fill chamber.
Chamber temperature low. Check heaterplate temperature setting on
diaplay when humidifier is switched on,
Chamber base and heaterplate are smooth
and flat and in good contact. (Chambers
not made by Fisher & Paykel may not be
suitable).
Gas flow rate too high for chamber. Check maximum flow rate in to chamber
operating instructions.
C1.6 ALARMS
Condition detected Possible cause FAction to take
Temperature probe alarm (‘---’
appears on display).
Temperature probe unplugged. Check connetion.
Temperature probe plug dirty. Clean plug.
Temperature probe faulty Replace probe.
Heater wire alarm while
temperature still displayed.
Heater wire unplugged. Check connection.
Heater wire broken. Replace heater wire.
Heater wire switch turned off but
heater wire connected.
Turn heater wire on.
Heater wire switch turned on but heater
wire not connected.
Turn heater wire off.
Heater wire alarm while ‘F2’
displayed.
Internal fuse blown. Send for repair.
41 °C Overheat calibration outside
limits.
Check calibration of the 41 °C
comparator.