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Manufacturer
Model
What This Guide Helps With
Addresses loss or interruption of ventilator air or oxygen supply caused by source, hose, connection, infrastructure, or equipment-related problems.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Ventilation
Treat any loss of required ventilator gas supply as a patient-safety issue. If ventilation or oxygen delivery is unreliable, immediately transition the patient to a verified alternative ventilator or backup ventilation method.
Do not disconnect a gas source from a ventilator supporting a patient solely for troubleshooting.
Expected outcome: Patient ventilation and oxygenation continue without dependence on the affected gas supply path.
2. Confirm Which Gas Supply Is Affected
Identify whether the ventilator reports an air supply problem, oxygen supply problem, or both. Record any displayed message exactly.
Determine whether the failure is continuous or intermittent.
Expected outcome: The affected supply path is identified.
3. Inspect Gas Hose Connections
Trace the affected hose from the ventilator to the source. Verify secure connections at both ends and inspect for kinks, crushing, visible damage, contamination, or loose fittings.
Expected outcome: The hose is securely connected and unobstructed. If restoring a loose connection clears the condition, proceed to final verification.
4. Verify the Gas Source
Check the wall outlet, cylinder-based source, or other approved supply using the facility's accepted method.
If another verified source is available, compare ventilator operation using that source.
Expected outcome: The external source is confirmed available. If the original outlet or source is faulty, remove it from use and report the infrastructure problem.
5. Check for Incorrect or Interchanged Connections
Confirm that the air and oxygen hoses are connected to their intended sources and ventilator inlets.
Do not assume labeling alone proves correct connection; visually trace the complete supply path.
Expected outcome: Air and oxygen supply paths are correctly connected.
6. Inspect Hose and Connector Condition
Examine accessible hose fittings, adapters, and ventilator gas inlets for physical damage or abnormal wear.
Substitute a known-good approved hose if the existing hose is questionable.
Expected outcome: The gas supply fault resolves with the known-good hose, identifying the original external component as the cause.
7. Compare With Another Device or Outlet
When infrastructure is suspected, compare the affected outlet with another known-good outlet or another suitable device according to facility policy.
Coordinate infrastructure findings with Facilities or the appropriate medical-gas service group.
Expected outcome: The fault is isolated to either the external gas infrastructure or the ventilator.
8. Restart and Recheck Off Patient
After gas supplies are verified and the patient is no longer dependent on the ventilator, restart or reinitialize the device if appropriate and observe whether the supply condition clears.
Expected outcome: The ventilator recognizes both required gas sources and no supply fault remains.
9. Perform Ventilation and Oxygen Verification
Use a test lung and approved test equipment to verify stable ventilator operation, gas delivery, and oxygen concentration following correction.
Expected outcome: Ventilation remains stable and gas-supply indications are normal. Troubleshooting can stop when all required checks pass.
10. Escalate an Internal Gas-Supply Failure
If verified gas sources and known-good hoses are available but the ventilator continues to report gas supply failure, stop external troubleshooting.
Expected outcome: The ventilator remains out of service for qualified evaluation.
If the Problem Persists
External source availability, hoses, connections, and infrastructure have been ruled out. Remaining causes may involve internal gas inlet, pneumatic regulation, sensing, gas-mixing, electronic, or control systems.
The ventilator should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate manufacturer documentation and approved test equipment
- Repaired or configured only by qualified personnel
Following repair, verify gas-source recognition, ventilation performance, oxygen delivery, alarms, and all applicable system checks before return to service. Recognizing when the problem has moved beyond the external supply path is proper troubleshooting.
Clinical Use Tip
A suspected ventilator gas-supply failure should trigger immediate confirmation of alternate ventilation capability before any connections are manipulated.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported that the Evita V600 indicated loss of oxygen supply during setup."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the external oxygen hose fitting was not fully engaged at the wall outlet."
Resolution
What action was taken.
Example:
"The connection was secured, gas supply recognition returned to normal, and ventilation and oxygen delivery were verified with test equipment before return to service."
Helpful Details to Include (If Known)
- Air, oxygen, or both affected
- Exact displayed message
- Hose connection condition
- Hose damage or kinking
- Wall outlet or source tested
- Alternate source tested
- Known-good hose substitution
- Gas supply status after correction
- Oxygen verification results
- Final device status
Final Thought
Gas supply failures should be handled by securing patient ventilation first, then tracing the complete external gas path before considering an internal ventilator problem. Verification after correction and precise CCR documentation are essential before the device returns to clinical service.
That is successful troubleshooting.