Troubleshooting
64
Error code Action
504 Unable to learn the circuit.
1. Ensure that the circuit is not moved until completion of the test.
2. Check the circuit and attached accessories for blockages.
3. Ensure that there are no sharp bends or kinks in the circuit and the patient end is not
blocked.
4. If using humidification, ensure that the humidifier tub is not overfilled.
5. Follow the on-screen instructions carefully:
• circuit should not be blocked during step 2
• circuit should be completely blocked during step 3.
If the problem persists, contact your clinician or an authorised Service Centre.
505 The measured circuit resistance exceeds safe operating limits for this device.
1. Check the circuit and attached accessories for blockages.
2. Ensure that there are no sharp bends or kinks in the circuit and the patient end is not
blocked.
3. If using humidification, ensure that the humidifier tub is not overfilled.
4. Follow the on-screen instructions carefully:
• circuit should not be blocked during step 2
• circuit should be completely blocked during step 3.
If the problem persists, contact your clinician or an authorised Service Centre.
506, 512 Hardware fault detected. Contact an authorised Service Centre.
600 Unable to calibrate Expiratory Flow Sensor.
1. Check the circuit adapter is clean, dry and firmly inserted.
• If the adapter is wet, then removing the adapter and vigorously shaking to clear
water can be effective. Re-insert adapter firmly and repeat Learn Circuit.
• If the adapter is not clean, then it will need to be replaced.
2. If using a small diameter paediatric breathing circuit, consider using an anti-bacterial
filter or a 22-mm adapter on the expiratory adapter port.
3. Repeat Learn Circuit and ensure that the circuit is not moved until completion of the
test.
If the problem persists, contact an authorised Service Centre.
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