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What This Guide Helps With
Persistent air-in-line or occlusion alarms caused by tubing, clamps, patient access, set placement, fluid conditions, accessories, or external sensor contamination.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Therapy
If an active infusion is affected, assess continuity of therapy with clinical staff and move the patient to another verified pump when interruption or unreliable delivery presents risk. Never defeat or bypass an alarm.
Expected outcome: Patient therapy is maintained safely while the affected pump is evaluated.
2. Confirm Which Alarm Is Occurring
Determine whether the pump consistently reports air-in-line, upstream occlusion, downstream occlusion, or alternates between alarms. Record when the alarm occurs: immediately after loading, during priming, shortly after starting, or after running normally.
Expected outcome: The specific failure pattern is established. If the problem is not reproducible and the device passes verification, troubleshooting can stop after documentation.
3. Inspect the Entire Administration Set
Trace the tubing from fluid source to patient connection. Look for closed clamps, pinched tubing, tight loops, kinks, crushed tubing, incorrectly positioned stopcocks, filters, check valves, or connectors.
Expected outcome: The fluid path is visibly open and unobstructed. If correcting an external obstruction resolves the alarm, verify delivery and stop troubleshooting.
4. Check the Fluid Source and Upstream Conditions
Confirm the fluid container is not empty, improperly vented where applicable, collapsed, positioned incorrectly, or connected through an obstructed accessory.
Expected outcome: Fluid can move freely from the source toward the pump. If the alarm clears after correcting the source condition, troubleshooting can stop after verification.
5. Inspect for Air and Priming Problems
Examine the tubing for bubbles, large air gaps, foam, or incomplete priming. Replace or reprime the administration set according to approved clinical procedures if necessary.
Expected outcome: The fluid path is properly primed and free of unacceptable visible air. Persistent air-in-line alarms with a correctly primed known-good set require further evaluation.
6. Check Set Placement Through the Pump
Verify that the tubing and cassette are fully seated in the correct path with no twisting, stretching, or partial engagement around accessible sensor areas.
Expected outcome: The administration set is correctly positioned. If reseating the set resolves the alarm, confirm stable operation and stop.
7. Inspect Accessible Sensor Areas
With the device removed from patient use, inspect accessible air-detection and pressure-sensing interfaces for contamination, dried fluid, residue, damaged surfaces, or foreign material. Clean only using approved methods.
Expected outcome: Sensor interfaces are clean and undamaged. If external contamination caused the false alarm and cleaning restores reliable operation, verify and stop.
8. Evaluate the Downstream Path Separately
If a downstream occlusion is reported, disconnect the pump from patient use and evaluate the disposable tubing independently. Clinical staff should assess the patient access device separately when appropriate.
Expected outcome: The pump is not blamed for resistance caused by the downstream tubing, clamp, connector, or vascular access.
9. Use a Known-Good Set
Replace the entire administration set with a known-good compatible set and test the pump outside patient use.
Expected outcome: The pump operates without inappropriate air or occlusion alarms. If so, the original disposable was likely involved and troubleshooting can stop.
10. Compare With Another Pump if Needed
If the alarm follows a specific set to another verified pump, investigate the set or fluid path. If multiple known-good sets alarm only on the affected pump, remove it from clinical use.
Expected outcome: The comparison separates disposable/fluid-path problems from a pump-specific detection problem.
11. Perform Final Functional Verification
Using an approved setup, confirm normal priming, startup, fluid delivery, and appropriate response to alarm conditions without persistent false alarms.
Expected outcome: The device operates reliably. Any unexplained intermittent or repeated alarm requires removal from service.
If the Problem Persists
Common external causes including closed clamps, tubing kinks, air, improper priming, fluid-source problems, patient-side resistance, disposable defects, loading errors, and accessible contamination have been ruled out. A persistent alarm may involve the pump's pressure-sensing system, air-detection system, mechanical loading interface, calibration, or other service-level condition.
Remove the device from service, label it Out of Service, and send it for repair or bench evaluation using appropriate Fresenius Kabi service documentation and approved test equipment. Qualified personnel should perform any required calibration, repair, or configuration.
Return to service only after alarm detection and infusion performance are verified.
Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Do not silence or repeatedly restart a pump with unexplained air or occlusion alarms while a patient depends on the infusion.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Nursing reported repeated downstream occlusion alarms shortly after starting an infusion."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the downstream tubing was pinched beneath an accessory clamp and the pump operated normally with the tubing repositioned."
Resolution
What action was taken.
Example:
"Corrected the tubing path, verified uninterrupted delivery and normal alarm behavior with a known-good setup, and returned the pump to service."
Helpful Details to Include (If Known)
- Exact alarm displayed
- Timing of alarm occurrence
- Fluid source condition
- Clamp and tubing position
- Visible air or priming condition
- Administration set type
- Patient access excluded from testing
- Accessible sensor-area condition
- Known-good set results
- Comparison with another pump
- Final alarm and delivery verification
- Final device status
Final Thought
Start with the entire fluid path before assuming a pump failure, protect uninterrupted therapy, verify alarm behavior with known-good disposables, and escalate any persistent sensing problem appropriately.
That is successful troubleshooting.