6 Troubleshooting

6.1Operational Problems

This section deals with faults that cause the humidifier to alarm. This may be caused by incorrect setup, faulty accessories, or a faulty humidifier. Refer below for troubleshooting.

Symptom

Corrective Action

Reference

See manual

Record the displayed error code.

Section 6.3

indicator flashing

 

 

 

with audible alarm

 

 

 

See manual

1.

If “PtS” is displayed on the front panel, then the production

Section 7.2.6

indicator light

 

test mode has been accessed. Check the production test

 

permanently on,

 

button is not depressed or mode set by serial command.

 

without an audible

2.

Humidifier faulty. Replace PCBs.

Section 7.2.3

alarm

 

 

 

 

Water Out indicator

1.

Check that there is sufficient water in the chamber. Refill

 

flashes,

 

 

or replace chamber as necessary. Check that the water

 

accompanied by an

 

bag is not empty, and the delivery tube is not kinked or

 

audible alarm

 

occluded.

 

 

 

2.

Check that the water level in the MR290 chamber is not

 

 

 

 

above the marked line. Replace chamber if the water is

 

 

 

 

above this line.

 

 

 

3.

Check that the gas flow rate is within specification of the

 

 

 

 

humidifier and accessories being used. Adjust as

 

 

 

 

necessary.

 

 

 

4.

Has condensate formed on the chamber probe? Dry

 

 

 

 

Probe and re-insert.

 

 

 

5.

Temperature probe faulty. Complete a temperature and

Section 8.2

 

 

 

flow accuracy test on the probe. Replace probe as

 

 

 

 

required.

 

 

 

6.

Humidifier faulty. Complete a performance test. Service

Section 8

 

 

 

humidifier as required.

 

Chamber Probe

1.

Check that the chamber probe is inserted into the

 

alarm flashes

 

breathing circuit correctly, and that the breathing circuit is

 

accompanied by an

 

set up correctly.

 

audible alarm

2.

Check that there is sufficient water in the chamber. Refill

 

 

 

 

as necessary. Check that the water bag and delivery tube

 

 

 

 

are not kinked or occluded.

 

 

 

3.

Ensure correct chamber is being used (refer Operating

 

 

 

 

Manual)

 

 

 

4.

Check that the gas flow rate is within specification of the

 

 

 

 

humidifier and accessories being used. Adjust as

 

 

 

 

necessary.

 

 

 

5.

Has condensate formed on the chamber probe? Dry

 

 

 

 

probe and re-insert.

 

 

 

6.

Temperature probe or humidifier faulty. Complete

Section 8

 

 

 

performance tests. Replace probe or service humidifier as

 

 

 

 

required.

 

Heater wire

1.

Check that the heater wire adaptor is correctly plugged into

 

connector alarm

 

the humidifier along with the breathing circuit.

 

flashes,

 

 

NOTE: The short lead must connect to the inspiratory limb.

 

accompanied by an

2.

Replace breathing circuit, and re-rest.

 

audible alarm

 

3.

Replace heater wire adaptor, and check for intermittent

 

 

 

 

 

 

 

connections. Re-test.

 

 

 

4.

Humidifier faulty. Replace PCBs.

Section 7.2.3

24

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