Fisher & Paykel MR850 manual 25

Symptom	Corrective Action		Reference
Heater wire alarm	Non-heater wire mode has been activated, connect a heated		Section 4.1.2
not working	wire circuit or disable this mode via the diagnostic menu.
Airway Probe	1.	Check that the airway probe is inserted into the breathing
alarm flashes along		circuit correctly, the breathing circuit assembled correctly,
with an audible		and that there is water in the chamber.
alarm	2.	Check that the circuit is connected correctly to the
		ventilator – gas flow could be reversed through the
		humidifier.
	3.	Check that the gas flow rate is within specification of the	Section 3.4
		humidifier and type of accessories being used. Adjust as
		necessary.
	4.	Check for excessive condensate build up. Excessively
		cold or drafty ambient conditions may cause this alarm to
		occur. Ensure there are no strong drafts around the
		breathing circuit.
	5.	Complete a probe accuracy check. Replace probe as	Section 8.2
		necessary.
	6.	Humidifier faulty. Replace PCBs.
Temperature / Flow	1.	If the Temperature / Flow Probe alarm occurs with	Section 4.4
Probe alarm with		chamber or airway indicators also flashing, the
airway or chamber		temperature probe is faulty.
indicators flashing	2.	Complete a probe accuracy check, and replace probe if	Section 8.2
		required.
Temperature probe	1.	Is the probe connector correctly plugged into the
connector indicator		humidifier? Plug in probe as required.
flashes,	2.	Check that the circuit is connected correctly to the
accompanied by an		ventilator – gas flow could be reversed through the
audible alarm		humidifier.
	3.	Perform a humidifier calibration check.	Section 8.1.2
	4.	Replace temperature probe and re-test. If the alarm	Section 8.2
		condition disappears, the temperature probe is faulty.
		Discard faulty probe.
	5.	Humidifier faulty. Replace PCBs.	Section 7.2.3
Temperature	The humidifier has been unable to maintain temperature over a
Indicator flashes,	period of time.
with audible alarm,	1.	Gas flow has been disconnected from the humidifier either
coupled with a low		reconnect gas flow or turn the humidifier off.
temperature	2.	Check that the gas flow rate is within specification of the
(< 35.5 °C)
		humidifier and accessories being used.
displayed
	3.	Check for drafts around the breathing circuit. This can be
		caused by fans or room air conditioning. If this is found to
		be the cause, the breathing circuit should be shielded from
		the ambient airflow.
	4.	Check that the circuit is connected correctly to the
		ventilator – gas flow could be reversed through the
		humidifier.

WARNING: Never cover the breathing circuit.

5.	Check for excessive condensate pooling in the breathing
	circuit. Drain circuit if necessary.
6.	Humidifier or probe faulty? Complete humidifier & probe	Section 8
	performance test. Replace probe or service humidifier as
	required.

7.Check that there is sufficient water in the chamber. Refill as necessary. Check that the water bag and delivery tube are not occluded.

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal) 25