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What This Guide Helps With
Pre-use check failures due to circuit setup, leaks, sensors, or configuration issues preventing the ventilator from passing readiness testing.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
- Do not use the ventilator on a patient if it fails pre-use check
- Move the patient to a verified working ventilator if needed
Expected: Patient is safely supported on another device
Why it matters: Pre-use check failures indicate the ventilator may not deliver safe or accurate ventilation
2. Verify the Reported Failure
- Run the pre-use check and observe exact failure message or step (leak test, flow sensor, pressure test)
- Note when the failure occurs during the sequence
Expected: Failure is repeatable and identifiable
Why it matters: Identifies whether the issue is circuit-related, sensor-related, or system-related
3. Inspect Patient Circuit Setup (Most Common Cause)
- Check correct circuit type selected in settings
- Ensure all tubing is securely connected
- Verify no missing components (filters, exhalation valve, humidifier bypass if applicable)
- Reseat all connections firmly
Expected: Properly assembled and secure circuit
Why it matters: Incorrect or loose setup frequently causes pre-use check failures
4. Check for Circuit Leaks
- Inspect for loose fittings
- Check for cracked tubing
- Ensure filters and adapters are properly seated
- Replace with a known-good circuit if available
Expected: Leak-free system
Why it matters: Even small leaks will cause failure during leak and pressure tests
5. Verify Flow Sensor Installation and Condition
- Confirm proper orientation (correct direction)
- Ensure sensor is clean and dry (no condensation or debris)
- Verify it is fully seated in the circuit
- Swap with a known-good sensor if available
Expected: Proper airflow measurement
Why it matters: Flow sensor issues commonly trigger calibration or pre-check failures
6. Check Exhalation Valve Function (if applicable)
- Inspect for proper placement
- Check for visible damage or obstruction
- Ensure valve is clean and dry
- Reseat or replace if questionable
Expected: Valve operates freely
Why it matters: Valve malfunction affects pressure and leak testing
7. Confirm Proper Test Setup (No Patient Connected)
- Ensure circuit is capped or configured per pre-use instructions
- Confirm no patient or open airway connection
- Use a test lung if required
Expected: Proper test environment
Why it matters: Incorrect test setup will cause false failures
8. Check Internal Settings and Mode Configuration
- Verify correct circuit type selected
- Confirm appropriate ventilation mode for testing
- Ensure no unusual alarm limits interfering with test
Expected: Settings aligned with test requirements
Why it matters: Incorrect configuration can prevent successful test completion
9. Power Cycle the Ventilator
- Turn the unit off
- Wait 10–15 seconds
- Power back on and rerun the pre-use check
Expected: System resets and test may pass
Why it matters: Clears temporary software or initialization issues
If the Problem Persists
If all external causes (circuit, sensor, setup, and configuration) have been ruled out, the issue is likely internal (pressure sensors, flow measurement system, or control board). 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 proper escalation.
Clinical Use Tip
Never attempt troubleshooting or pre-use checks while a patient is connected. Always verify ventilator readiness before clinical use.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Ventilator failed pre-use check and would not pass system test."
Cause
What was observed during troubleshooting.
Example:
"Leak identified in patient circuit due to loose connection at flow sensor."
Resolution
What action was taken.
Example:
"Reseated connections, replaced circuit, and confirmed unit passed pre-use check successfully."
Helpful Details to Include (If Known)
- Pre-use check failure step (leak test, calibration, pressure test)
- Circuit type used
- Flow sensor condition
- Leak presence or absence
- Alarm messages displayed
- Whether circuit was replaced
- Final device status (passed/failed)
Final Thought
Pre-use check failures are often caused by simple external setup issues rather than internal faults. A structured approach—starting with the circuit and accessories—ensures safe, efficient troubleshooting. Escalate appropriately when needed, and always prioritize patient safety and clear documentation.
That is successful troubleshooting.