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What This Guide Helps With
Troubleshooting occlusion alarms caused by tubing restriction, clamp position, pressure settings, IV site issues, or pump setup problems.
Step-by-Step Troubleshooting
Ensure Patient Safety First
If the pump is actively infusing and an occlusion alarm occurs, notify clinical staff and ensure the patient’s therapy is not interrupted without clinical awareness.
Do not clear the alarm repeatedly without confirming the cause.
Expected outcome: Patient therapy is protected while the alarm condition is evaluated.
Why it matters: An occlusion alarm may indicate that medication or fluid is not reaching the patient.
Confirm the Reported Alarm
Review the pump display and confirm the alarm is an occlusion alarm, not air-in-line, door open, battery, keep vein open, or infusion complete.
Note whether the alarm is:
- Upstream occlusion
- Downstream occlusion
- Intermittent during infusion
- Immediate after start
- Occurring only with a specific channel, tubing set, or medication setup
Expected outcome: The alarm type and timing are confirmed before troubleshooting continues.
Stop Troubleshooting on the Patient When Needed
If the issue cannot be quickly verified externally, have clinical staff move the infusion to another pump or line as appropriate.
Expected outcome: Clinical therapy continues safely on a reliable setup.
If this resolves the clinical situation, continue evaluating the removed pump separately.
Inspect the IV Tubing Path
Trace the tubing from the fluid container to the patient connection.
Check for:
- Closed roller clamp
- Kinked tubing
- Tubing caught under the pump door
- Tubing pinched by bed rails, blankets, or patient positioning
- Tubing routed too tightly around the pump
- Extension set restriction
Expected outcome: Tubing should be open, straight, properly routed, and free of visible restriction.
If a kink or closed clamp is found, correct it, restart per clinical policy, and stop if the alarm clears.
Check the Fluid Source and Upstream Side
Verify the fluid container has adequate volume and is hanging properly.
Inspect the spike, drip chamber, venting if applicable, and upstream tubing for restriction.
Expected outcome: Fluid should flow freely to the pump when the upstream path is open.
Why it matters: Upstream restriction can trigger occlusion-like behavior or cause abnormal pumping conditions.
Check the Downstream Side
Inspect the tubing from the pump outlet to the patient.
Look for:
- Closed slide clamp
- Kinked extension tubing
- Stopcock turned off
- Injection cap obstruction
- Filter restriction
- Tight or bent tubing near the IV site
- Patient arm position causing flow restriction
Expected outcome: The downstream path should be open and unrestricted.
If a closed clamp or stopcock is found, correct the issue and stop if normal infusion resumes.
Have Clinical Staff Assess the IV Site
Ask nursing or authorized clinical staff to verify IV patency.
Do not attempt to clinically assess or manipulate the patient’s IV site unless within your role and facility policy.
Expected outcome: The IV site is confirmed patent, or the infusion is moved to another access point.
Why it matters: A good pump can alarm correctly if the patient line is infiltrated, positional, or occluded.
Verify Tubing Is Loaded Correctly
Remove the pump from patient use before opening the door for equipment inspection.
Check that the administration set is properly seated in the pumping mechanism and sensor areas.
Look for stretched, flattened, damaged, or incorrectly installed tubing.
Expected outcome: Tubing should sit correctly in the pump path without being pinched or misaligned.
If improper loading is found, reload with a new approved set and test again.
Use a Known-Good B. Braun-Compatible Administration Set
Replace the tubing set with a known-good, correct administration set approved for the Outlook 400ES.
Do not reuse suspect tubing if it appears damaged, stretched, contaminated, or restricted.
Expected outcome: If the original set was restricted or damaged, the occlusion alarm should not return with a known-good set.
Check Occlusion Pressure Setting or Therapy Configuration
Review the pump setup with clinical staff to confirm the selected therapy, rate, and pressure/occlusion settings are appropriate for the infusion.
Expected outcome: Pump settings should match the intended clinical use and facility policy.
Why it matters: A low occlusion pressure limit or inappropriate setup may alarm during a clinically normal infusion.
Test the Pump Away From the Patient
Remove the Outlook 400ES from patient use and test it with:
- Known-good tubing
- Appropriate test fluid setup
- Open downstream path
- Controlled test container or outlet setup
Start an infusion and observe whether the occlusion alarm occurs under normal unrestricted flow.
Expected outcome: The pump should infuse without occlusion alarms when the fluid path is open.
If the pump works normally during bench testing, the original issue was likely related to tubing, setup, pressure setting, or patient line restriction.
Check for External Damage or Contamination
Inspect the pump door, latch, tubing channel, pressure sensor area, and exterior housing.
Look for:
- Sticky medication residue
- Cracked door or latch
- Damaged tubing guide
- Debris in the tubing path
- Signs of fluid intrusion
- Unusual heat, smell, or noise
Expected outcome: The pump should be clean, intact, and free of visible damage.
If contamination is found in the tubing path, clean according to facility procedure and retest.
Repeat Test After Cleaning and Setup Correction
After correcting external causes, repeat a controlled infusion test.
Confirm:
- No occlusion alarm occurs
- Pump runs at the selected rate
- Door and latch remain secure
- Alarm clears normally
- No abnormal noise or mechanical behavior is present
Expected outcome: Pump operates normally without false occlusion alarms.
If the pump passes testing, document the findings and return to service according to facility policy.
Remove From Service if Alarm Repeats Without Restriction
If the Outlook 400ES continues to alarm for occlusion with known-good tubing, open clamps, correct setup, and unrestricted flow, remove it from service.
Expected outcome: Suspect internal pressure sensing or pumping mechanism issues are escalated for repair.
If the Problem Persists
If common external causes have been ruled out, the issue is likely internal to the pump’s pressure sensing, door mechanism, pumping system, or related electronics.
The device should be removed from service, labeled Out of Service, and sent for repair or bench evaluation.
Knowing when to stop is proper troubleshooting. Repeatedly clearing an occlusion alarm without finding the cause can create patient safety risk.
Clinical Use Tip
Do not troubleshoot an active infusion on a patient longer than necessary. If the cause is not immediately obvious, have clinical staff move the infusion to another pump or access point before continuing equipment evaluation. Maintain therapy continuity before continuing troubleshooting.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Nursing reported that the B. Braun Outlook 400ES repeatedly displayed an occlusion alarm during a normal infusion."
Cause
What was observed during troubleshooting.
Example:
"Inspection found the downstream extension tubing was kinked near the bed rail, causing flow restriction."
Resolution
What action was taken.
Example:
"Tubing was repositioned, infusion was restarted by clinical staff, pump was tested with known-good tubing, and no further occlusion alarms occurred."
Helpful Details to Include (If Known)
- Exact occlusion alarm displayed
- Upstream or downstream alarm if identified
- Infusion rate and therapy type if provided
- Tubing set changed or reused
- Clamps and stopcocks checked
- IV site assessed by clinical staff
- Pump tested off patient
- Known-good tubing used
- Door and latch condition
- Any residue, fluid intrusion, or physical damage
- Whether alarm repeated during bench testing
- Final device status
Final Thought
Occlusion alarms should be approached logically and safely. Start with the patient, tubing, clamps, fluid path, and setup before suspecting pump failure. If the alarm repeats under controlled conditions with known-good accessories, escalation is appropriate. Clear CCR documentation helps distinguish a true device issue from a setup or line restriction problem.
That is successful troubleshooting.