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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
24
6 Troubleshooting
6.1 Operational 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
indicator flashing
with audible alarm
Record the displayed error code. Section 6.3
1. If “PtS” is displayed on the front panel, then the production
test mode has been accessed. Check the production test
button is not depressed or mode set by serial command.
Section 7.2.6
See manual
indicator light
permanently on,
without an audible
alarm
2. Humidifier faulty. Replace PCBs. Section 7.2.3
1. Check that there is sufficient water in the chamber. Refill
or replace chamber as necessary. Check that the water
bag is not empty, and the delivery tube is not kinked or
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
flow accuracy test on the probe. Replace probe as
required.
Section 8.2
Water Out indicator
flashes,
accompanied by an
audible alarm
6. Humidifier faulty. Complete a performance test. Service
humidifier as required.
Section 8
1. Check that the chamber probe is inserted into the
breathing circuit correctly, and that the breathing circuit is
set up correctly.
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.
Chamber Probe
alarm flashes
accompanied by an
audible alarm
6. Temperature probe or humidifier faulty. Complete
performance tests. Replace probe or service humidifier as
required.
Section 8
1. Check that the heater wire adaptor is correctly plugged into
the humidifier along with the breathing circuit.
NOTE: The short lead must connect to the inspiratory limb.
2. Replace breathing circuit, and re-rest.
3. Replace heater wire adaptor, and check for intermittent
connections. Re-test.
Heater wire
connector alarm
flashes,
accompanied by an
audible alarm
4. Humidifier faulty. Replace PCBs. Section 7.2.3