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What This Guide Helps With
Pre-use check or leak test failing due to circuit leaks, loose connections, incorrect setup, or accessory issues.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the ventilator from patient use before troubleshooting
- Use a backup ventilator if needed
Expected: Patient is supported on a safe, functioning device.
Why it matters: Leak issues can compromise ventilation accuracy and patient safety.
Verify the Reported Failure
- Run the pre-use check again and observe the exact failure message
- Check for leak test failure, volume loss warnings, or specific component prompts
Expected: Clear identification of the failure step.
Why it matters: Helps isolate whether the issue is circuit-related or device-related.
Inspect the Patient Circuit Assembly
- Ensure all tubing connections are fully seated
- Look for cracks, tears, or loose fittings
- Confirm proper assembly per configuration
Expected: Circuit is intact with no visible leaks.
Why it matters: Most leak failures are caused by circuit integrity issues.
Check the Test Lung and Accessories
- Confirm test lung is properly attached
- Ensure no open ports or missing caps
- Replace test lung if suspected faulty
Expected: Proper closed system for testing.
Why it matters: An incomplete or open system will always fail a leak test.
Inspect Filters, Water Traps, and Valves
- Ensure filters are seated correctly
- Check water traps for proper sealing
- Verify valves are installed and not loose
Expected: All components properly installed with no gaps.
Why it matters: Misaligned or loose accessories introduce leaks.
Check Inspiratory and Expiratory Ports
- Ensure circuit is firmly connected to both ports
- Check for damaged seals or O-rings
- Remove and reseat connections
Expected: Tight, secure connections at ventilator ports.
Why it matters: Even small leaks at ports can cause test failure.
Replace the Circuit with a Known Good Setup
- Use a new or verified working circuit
- Re-run the pre-use check
Expected: Leak test passes with known good circuit.
Why it matters: Confirms whether issue is circuit vs ventilator.
Check for Environmental or Setup Errors
- Ensure all ports are capped if not in use
- Verify correct mode/setup for pre-use check
- Confirm no additional devices are connected improperly
Expected: Proper configuration for testing.
Why it matters: Incorrect setup can mimic a leak condition.
If the Problem Persists
If all external components, circuits, and setup conditions have been verified and the leak test still fails, the issue is likely internal (e.g., internal valves, pressure sensors, or pneumatic system).
Remove the ventilator from service, label it Out of Service, and send for repair or bench evaluation.
Knowing when to stop prevents unnecessary risk and ensures patient safety.
Clinical Use Tip
Never attempt to troubleshoot or run leak tests while the ventilator is connected to a patient. Always use a test lung and remove from service first.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Ventilator failed pre-use check with leak test error."
Cause
What was observed during troubleshooting.
Example:
"Leak identified in patient circuit due to loose expiratory limb connection."
Resolution
What action was taken.
Example:
"Secured connections and replaced circuit; pre-use check passed successfully."
Helpful Details to Include (If Known)
- Pre-use check error message displayed
- Circuit condition and type used
- Test lung used and condition
- Filters and water traps checked/replaced
- Ports and seals inspected
- Whether issue resolved with circuit replacement
- Final device status (passed/failed testing)
Final Thought
Pre-use check failures are most commonly caused by external setup issues, not internal failures. A methodical approach—starting with the circuit and accessories—ensures safe, efficient troubleshooting. Recognizing when the issue is internal and escalating appropriately protects both the patient and the integrity of the device.
That is successful troubleshooting.