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What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting pre-use check failures on a Hamilton T1 ventilator. Pre-use check failures typically indicate issues with the breathing circuit, sensors, or setup configuration. Most failures are caused by external setup problems or component issues rather than internal faults.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Ensure the ventilator is not connected to a patient
- Pre-use checks must be performed off-patient to avoid false failures and ensure patient safety.
Verify proper circuit setup
- Confirm the breathing circuit is assembled correctly and matches the selected configuration (adult/pediatric, single/dual limb).
- Misconfigured circuits are one of the most common causes of failure.
Check all circuit connections
- Inspect connections at the ventilator, humidifier, and patient wye.
- Loose or partially connected tubing can cause leaks and test failure.
Inspect the circuit for damage or leaks
- Look for cracks, holes, or worn tubing.
- Replace the circuit if any damage is found.
Confirm correct humidifier setup (if in use)
- Ensure the humidifier is properly connected and not introducing leaks.
- If unsure, temporarily remove the humidifier and rerun the test.
Check and reseat flow sensor(s)
- Ensure the flow sensor is clean, dry, and properly connected.
- Moisture or debris can cause calibration or accuracy failures.
Verify expiratory valve and filter condition
- Inspect for contamination, moisture, or blockage.
- Replace disposable components if needed.
Ensure proper gas supply (if applicable)
- If using external oxygen, confirm the supply is connected and within normal pressure range.
- Inadequate supply can cause test failures.
Restart the ventilator and rerun the pre-use check
- A reboot can clear temporary faults or incomplete initialization.
Try a known-good circuit and components
- Swap with a verified working setup to isolate whether the issue is accessory-related.
If the Problem Persists
If the pre-use check continues to fail after verifying circuit setup, connections, sensors, and accessories, the issue is likely internal (e.g., internal flow sensors, valves, or control system faults).
- Remove the ventilator from service
- Label as Out of Service
- Send for repair or further bench evaluation
Recognizing when external causes have been ruled out is an important part of proper troubleshooting.
Clinical Use Tip
Do not attempt to troubleshoot or run pre-use checks while the ventilator is in use on a patient. Always transition the patient to another ventilator before performing testing to ensure continuous and safe ventilation.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Ventilator fails pre-use check during setup; will not pass system test.”
Cause
What was observed during troubleshooting.
Example:
“Leak detected due to loose circuit connection at expiratory limb (or contaminated flow sensor, or faulty circuit).”
Resolution
What action was taken.
Example:
“Reseated all connections and replaced breathing circuit; pre-use check passed successfully.”
Helpful Details to Include
- Circuit type used (adult/pediatric, single/dual limb)
- Whether a known-good circuit was tested
- Condition of flow sensor and expiratory valve
- Gas supply status (connected/not connected)
- Any visible damage or moisture in components
- Alarm or failure message displayed
- Final device status (passed/failed and removed from service if applicable)
Final Thought
Pre-use check failures are most often caused by setup or accessory issues rather than internal ventilator problems. A structured approach—starting with simple external checks—ensures efficient troubleshooting while protecting patient safety. Knowing when to escalate and documenting clearly are key responsibilities in Clinical Engineering.
That is successful troubleshooting.