Check Patient Circuit Alarm Troubleshooting

Check Patient Circuit activates when VOCSN detects an inadequate leak in a passive or valveless circuit, or an error in the flow sensor of an active circuit.

Follow these steps to troubleshoot this alarm:

1. Run a Pre-Use Test. If the test does not pass, see Why Is the Pre-Use Test Failing?
2. For Passive circuits, check the VOCSN Leak monitor. If needed, locate and resolve any unintentional leaks in the patient circuit (or around the patient interface) and ensure the exhalation valve is not obstructed (for example, by crystallized medications in the exhalation valve). If there are no leaks, check the exhalation valve to ensure it is not clogged with patient secretions or crystalized nebulizer medications. If the exhalation valve is clogged, replace the circuit.
3. For Active circuits, make sure the flow sensor (multilumen) tubing is securely connected to VOCSN and all three connection points are securely attached at the active exhalation valve.
4. If using a nebulizer (particularly with sticky medications), install a filter (HMEF or bacterial filter) between the nebulizer and the patient circuit exhalation valve.
5. If you’re using an external nebulizer, make sure you turn on External Neb. Compensation while running the nebulizer, and ensure you are using a 6 L/min nebulizer cup.
6. If using Cough therapy, and patient secretions are entering the patient circuit, install a filter (such as an HMEF), and/or use a 6” length of corrugated circuit tubing between the patient interface and the patient circuit exhalation valve during Cough to catch secretions.
7. For heated circuits, ensure there is no water accumulation in the tubing or valve. If there is water accumulation (rain out) in the circuit, drain it. 
8. Check your external and internal bacterial filters. If either is wet, soiled, or damaged, replace it.
9. If the problem persists, replace the patient circuit.