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What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting a Smiths Medical CADD Legacy infusion pump that displays a “Check Cassette” error or refuses to start infusion. Symptoms may include:
- Pump displays “Check Cassette” on the screen
- Pump will not start infusion
- Audible alarm may be active
Focus is on external checks for cassette seating and latch engagement before considering internal repair.
Step-by-Step Troubleshooting
Power Cycle the Pump
- Turn the pump off, wait ~10 seconds, then power it back on.
Why: Clears temporary sensor misreads and ensures error isn’t a transient fault.
Inspect the Cassette and Slot
- Remove the infusion cassette completely.
- Check for obstructions, debris, or misaligned tubing.
Why: Even minor blockage can prevent proper seating.
Reinsert the Cassette Properly
- Align the cassette with the pump guides.
- Insert fully until the latch clicks or stops moving.
Why: Proper engagement is required for the sensor to detect the cassette.
Check the Latch Mechanism
- Observe that the latch moves freely and is not bent, broken, or sticky.
- Clean lightly if necessary with a lint-free cloth.
Why: Latch interference can prevent sensor detection.
Verify Sensor Engagement
- With cassette seated, check if the “Check Cassette” error clears.
- If equipped, inspect the sensor visually for damage or misalignment.
Attempt Infusion Only After Error Clears
- Only start infusion when the error has cleared and the pump accepts programming.
If the Problem Persists
External causes (cassette seating, debris, latch issues) have been ruled out. Internal latch or sensor failure is likely.
- Remove pump from service
- Label Out of Service
- Send for manufacturer repair or bench evaluation
Clinical Use Tip
- Never attempt to bypass the cassette sensor with a patient connected.
- Move the patient to another pump if therapy is critical.
- Only troubleshoot when safe and the pump is disconnected from the patient.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Pump displays “Check Cassette” error and will not start infusion.”
Cause
What was observed during troubleshooting.
Example:
“Cassette partially seated or latch obstructed by debris.”
Resolution
What action was taken.
Example:
“Cleared debris, reinserted cassette fully, verified latch and sensor engagement, pump operational.”
Helpful Details to Include
- Cassette seating and alignment checked
- Latch mechanism cleaned and inspected
- Sensor visually checked
- Pump surface stable during insertion
- Final pump status: operational / out of service if unresolved
Final Thought
Troubleshooting starts with simple, external verification of cassette seating and latch engagement. Escalate only when internal sensor or latch mechanisms fail, always keeping patient safety as the top priority. Clear CCR documentation preserves accountability and supports maintenance decisions.
That is successful troubleshooting.