Fisher & Paykel MR700, MR720, MR730, MR480 technical manual LED on

		53
C1.7	TEMPERATURE DISPLAY
	Condition detected	Possible cause	FAction to take
	No temperature display, no alarm	Humidifier voltage rating incorrect.	Select correct voltage rated unit.
	lights.
		Heaterplate overheat protector	Reset overheat protector.
		operated.
		Transformer over heat protector	Replace transformer.
		operated.
	No temperature display, ‘see	Control PCB fault.	Check control PCB for water damage.or
	manual’ indicator light on.		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 O-ring faulty.	O-ring should be clean and properly
	chamber.		fitted. Replace if damaged.
	Water leak with disposable	Chamber used beyond lifespan.	Replace with new chamber.
	chamber.
C1.10	LED ON
	Condition detected	Possible cause	FAction to take
	An alarm LED is flashing.	No audible sound - mute switch has	Wait three minutes.
		been pressed.
	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	Re-adjust. Refer to humidifier operating
		control setting too low.	manual.

Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001