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What This Guide Helps With
This guide addresses the “Safety valve open” alarm, indicating a gas bypass condition. This can result in unreliable or absent ventilation due to gas supply failure or a critical internal system fault.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
- Immediately assess the patient’s ventilation status
- Remove the ventilator from use if ventilation is compromised
- Provide alternate ventilation (bag-valve mask or backup ventilator)
2. Verify the Reported Alarm and Behavior
- Confirm the ventilator displays “Safety valve open”
- Observe when the alarm occurs (startup, during use, intermittent)
- Check for reduced, absent, or inconsistent ventilation
- Look for additional alarms (gas supply, pressure, system faults)
3. Check Gas Supply Sources (Most Common Cause)
- Verify air and oxygen hoses are securely connected
- Confirm pipeline pressure is adequate (typically > 3 bar / ~43 psi)
- Ensure hoses are not kinked or disconnected
4. Inspect External Gas Connections and Hoses
- Inspect hoses for leaks, cracks, or damage
- Verify correct gas connections (air to air, O₂ to O₂)
- Swap hoses if damage is suspected
5. Perform Device/System Check
- Initiate System Self Test (SST) or device check
- Observe for failures during gas delivery or pressure testing
6. Isolate the Issue
- If gas supply issue found → Correct and retest
- If external connections faulty → Repair/replace and retest
- If system test fails or alarm persists → Suspect internal failure
7. Stop When Resolved
- Confirm normal ventilation resumes
- Verify no recurring alarms
- Return the ventilator to service only after full verification
If the Problem Persists
If all external causes have been ruled out and the alarm remains, this indicates a likely internal failure such as a safety valve or gas control issue.
- Remove the device from service
- Label Out of Service
- Send for repair or bench evaluation
Clinical Use Tip
Never troubleshoot on an active patient. Always move the patient to a verified ventilation source before addressing device issues.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Ventilator displaying 'Safety valve open' alarm with reduced ventilation output during use."
Cause
What was observed during troubleshooting.
Example:
"Gas supply verified functional; alarm persisted after system test, indicating likely internal safety valve or gas control fault."
Resolution
What action was taken.
Example:
"Removed ventilator from service, labeled out of service, and sent to Biomed/vendor for repair evaluation."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Safety valve alarms indicate protective system behavior in response to serious faults. Always verify external gas sources first, prioritize patient safety, and escalate promptly when the issue persists.
That is successful troubleshooting.