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What This Guide Helps With
This guide addresses situations where a Servo-i ventilator reports expiratory cassette errors. These errors often indicate issues with the cassette installation, sensors, or external tubing rather than internal hardware failure. The focus is on simple, external, and easily verifiable causes—such as cassette seating, tubing, and software configuration—before escalating for repair.
Step-by-Step Troubleshooting
Ensure the ventilator is powered off before handling the cassette
- Safety first: avoid disconnecting tubing or cassettes while the device is active on a patient.
Verify expiratory cassette installation
- Remove and reinstall the expiratory cassette.
- Listen for the “click” indicating it is fully seated.
- Misalignment can cause error codes.
Inspect cassette and sensors for debris or damage
- Check for moisture, secretions, or obstructions in the expiratory cassette.
- Ensure the sensor ports are clean and unobstructed.
Check expiratory tubing connections
- Confirm all patient circuit tubing is securely connected.
- Ensure there are no kinks, pinches, or leaks that could trigger cassette errors.
Run a ventilator self-test
- After verifying installation and connections, power on the ventilator and initiate a system self-test.
- Observe whether the expiratory cassette error clears.
- If the error persists, note the exact error code for escalation.
Verify software and calibration status
- Ensure the ventilator’s software is up to date.
- Confirm calibration logs do not indicate failed expiratory cassette calibration.
If the Problem Persists
Common external causes have been ruled out.
Action: Remove the ventilator from service, label it Out of Service, and send for bench evaluation or vendor repair.
Remember: stopping at this point is proper troubleshooting and maintains patient safety.
Clinical Use Tip
- Never troubleshoot the expiratory cassette while a patient is connected.
- Move the patient to a backup ventilator before performing any interventions.
- Always check alarms and circuit integrity first to ensure patient safety.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
Ventilator displays expiratory cassette error code during setup.
Cause
What was observed during troubleshooting.
Example:
Cassette was not fully seated; tubing connections were loose.
Resolution
What action was taken.
Example:
Reinstalled expiratory cassette, secured tubing connections, ran self-test—device passed and returned to service.
Helpful Details to Include
- Outlet tested: Yes / No
- Tubing checked for leaks or kinks
- Sensor ports inspected and cleaned
- Error codes recorded
- Cassette seating verified
- Final device status: Ready for patient use or Out of Service
Final Thought
Proper troubleshooting begins with external, easily verifiable causes. Confirm cassette installation, tubing integrity, and sensor cleanliness before assuming internal failure. Always prioritize patient safety by moving the patient first and documenting your findings thoroughly. Escalation to repair is appropriate when external checks are exhausted.
That is successful troubleshooting.