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What This Guide Helps With
Troubleshoots centrifugal pump drive recognition or unexpected stopping by checking power, connections, compatible accessories, controls, and communication before escalation.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Circulatory Support
Do not troubleshoot an unreliable centrifugal pump drive while it is providing patient flow. If the drive stops or becomes unrecognized during clinical use, immediately execute the facility perfusion backup plan and establish flow using verified alternate equipment.
Do not repeatedly restart a drive that stops unexpectedly during patient support.
Expected outcome: Patient circulation is maintained independently of the suspect centrifugal pump drive.
Once the affected drive is no longer supporting the patient, troubleshooting may continue.
2. Confirm the Exact Failure
Determine whether:
- The drive is absent from the system at startup.
- It is initially recognized but later disappears.
- The pump starts and then stops.
- A display or module indicates loss of communication.
- Recognition changes when the cable is moved.
- The problem began after equipment relocation or accessory replacement.
Record any displayed message exactly.
Expected outcome: The problem is categorized as startup recognition, intermittent connection, or unexpected stopping.
If recognition returns and remains stable through repeated controlled testing, troubleshooting can stop.
3. Verify Power and Module Readiness
Confirm the S5 console and associated pump-control hardware are fully powered and have completed normal startup. Check that the affected drive is connected to the expected powered system configuration.
Expected outcome: The supporting console and control module are operational and ready to communicate with the centrifugal drive.
If restoring normal system power resolves the issue, troubleshooting can stop after verification.
4. Inspect the Drive Cable and Connectors
With the equipment safely out of clinical use, inspect accessible drive and system cables for:
- Loose connectors
- Damaged connector shells
- Bent or contaminated contacts visible externally
- Cable cuts or crushing
- Strain near connector ends
- Evidence of fluid intrusion
Reseat only approved external connections.
Expected outcome: The drive connections are secure and free of visible damage.
If reseating a connection restores reliable recognition and controlled operation, troubleshooting can stop after repeated verification.
5. Verify the Pump Head and Disposable Interface
Inspect the compatible centrifugal pump head and its seating in the drive. Confirm it is correctly positioned, fully engaged, undamaged, and free of foreign material at the interface.
Do not troubleshoot using a patient-connected disposable circuit.
Expected outcome: The disposable pump head interfaces correctly with the drive and does not create an obvious mechanical or recognition problem.
If correcting seating or replacing a defective disposable with a known-good compatible item restores operation, troubleshooting can stop after verification.
6. Compare With Known-Good Compatible Components
When permitted by approved procedures, substitute a known-good compatible drive cable, pump head, or drive assembly one component at a time.
Maintain clear control of which component is being tested.
Expected outcome: The problem follows one replaceable external component or remains with the original drive/system connection.
If a defective external component is identified and replaced successfully, troubleshooting can stop after final functional testing.
7. Check Normal Controls and Configuration
Verify that the centrifugal pump function is enabled and configured as expected for the installed system. Confirm no externally accessible stop condition or control selection is preventing operation.
Do not alter restricted configuration or bypass safety functions.
Expected outcome: The drive is correctly enabled within the normal operating configuration.
If an authorized control or configuration correction restores stable function, troubleshooting can stop.
8. Perform Controlled Functional Verification
Under approved bench conditions, verify:
- Drive recognition remains stable.
- The pump starts and stops normally.
- Speed commands produce predictable response.
- No unexpected interruptions occur.
- Cables remain stationary and secure.
- Relevant alarms or status indications function.
Expected outcome: The centrifugal pump drive remains recognized and operates reliably during repeated testing.
If all checks pass, troubleshooting is complete.
9. Escalate Persistent Recognition or Shutdown Problems
If recognition remains intermittent or the drive stops unexpectedly after external components and connections are ruled out, remove the system from service.
Do not disassemble the drive motor, internal sensors, communication circuitry, or module electronics without authorized service procedures.
Expected outcome: Unreliable centrifugal pump equipment is prevented from returning to patient care.
If the Problem Persists
External power, cable, disposable interface, controls, and known-good substitution checks have not resolved the condition. Remaining causes may involve the drive electronics, internal communication circuitry, motor control, internal sensing, or protected configuration.
The affected equipment should be:
- Removed from service.
- Labeled Out of Service.
- Sent for repair or bench evaluation.
- Evaluated using appropriate LivaNova documentation and approved test equipment.
- Repaired or configured only by qualified personnel.
Complete applicable pump-drive, communication, alarm, and operational return-to-service testing before release.
Knowing when to stop troubleshooting an intermittent pump drive is proper troubleshooting.
Clinical Use Tip
A centrifugal drive that has stopped unexpectedly even once should not be relied upon for bypass until the cause is identified or the equipment has been formally evaluated and verified.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Perfusion reported that the S5 centrifugal pump drive was intermittently not recognized during setup."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the external drive cable connector was not fully seated at the system connection."
Resolution
What action was taken.
Example:
"Clinical Engineering reseated and secured the connection and verified consistent drive recognition and normal operation through repeated bench testing."
Helpful Details to Include (If Known)
- When recognition was lost
- Whether the drive stopped while running
- Any displayed message
- Drive cable condition
- Connector condition
- Pump head seating
- Known-good substitutions performed
- Response when cables were moved
- Startup versus operating behavior
- Final test result
- Final device status
Final Thought
Treat any centrifugal-drive interruption as a patient-safety concern. Verify external power, connections, disposable interfaces, controls, and compatible substitutions before suspecting internal hardware, and escalate any intermittent or unexplained failure that cannot be confidently resolved.
That is successful troubleshooting.