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Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
C1.7 TEMPERATURE DISPLAY
Condition detected Possible cause FAction to take
No temperature display, no alarm
lights.
Humidifier voltage rating incorrect. Select correct voltage rated unit.
Heaterplate overheat protector
operated.
Reset overheat protector.
Transformer over heat protector
operated.
Replace transformer.
No temperature display, ‘see
manual’ indicator light on.
Control PCB fault. Check control PCB for water damage.or
contamination.
Error code. Humdifier failed self test. Check control PCB for water damage or
contamination.
Check thermistor conection to control
PCB.
If new PCB fitted, check correct polarity
of transformer secondary harness.
C1.8 BREATHING CIRCUIT LEAK
Condition detected Possible cause FAction to take
Breathing circuit leak. Faulty circuit connections. Check all circuit connections.
No water bag. Connect water bag
Temperature probes incorrectly fitted. Check connections.
Chamber filler stopper missing. Put stopper in place.
C1.9 EXTERNAL WATER LEAK
Condition detected Possible cause FAction to take
Water leak with reusable
chamber.
Chamber O-ring faulty. O-ring should be clean and properly
fitted. Replace if damaged.
Water leak with disposable
chamber.
Chamber used beyond lifespan. Replace with new chamber.
C1.10 LED ON
Condition detected Possible cause FAction to take
An alarm LED is flashing. No audible sound - mute switch has
been pressed.
Wait three minutes.
Standby LED is flashing. Humidifier is in standby mode. Puch button for 1 second to disable.
Wait 20 minutes (30 minutes for v3.0
software).
‘Set Low’ LED is on. Chamber control or airway temperature
control setting too low.
Re-adjust. Refer to humidifier operating
manual.