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What This Guide Helps With
Troubleshoots persistent gas-supply alarms caused by hoses, connectors, source selection, restrictions, intermittent supply, or service-level pressure-sensing faults.
Step-by-Step Troubleshooting
1. Protect the Patient and Ensure Reliable Ventilation
Do not troubleshoot a persistent gas-supply alarm while the patient depends on the affected gas path.
Move the patient to a verified ventilator or establish appropriate backup ventilation and gas supply before technical testing.
Expected outcome: Patient ventilation continues independently of the affected Servo-n.
2. Confirm Which Gas Supply Is Affected
Determine whether the alarm concerns:
- Air
- Oxygen
- Both gases
- Only one wall outlet
- Only one hose or cylinder source
Document whether the alarm is continuous or intermittent.
Expected outcome: The affected supply path is clearly identified.
3. Verify the Source With Appropriate Test Equipment
Confirm that the gas source actually provides acceptable pressure and flow under the applicable facility and manufacturer requirements.
Do not assume the source is normal solely because another device is connected nearby.
Expected outcome: The external gas source is independently confirmed functional.
4. Inspect the Supply Hose
Inspect the complete hose for:
- Kinks
- Compression
- Internal restriction signs
- Cracked fittings
- Damaged quick-connects
- Incorrect gas-specific connection
- Loose coupling
Reseat both ends.
Expected outcome: The hose is correctly connected and physically intact.
5. Try an Alternate Verified Source
When available, connect the ventilator to another known-good wall outlet or approved gas source.
Expected outcome: If the alarm clears on the alternate source, investigate the original infrastructure connection rather than the ventilator.
6. Try a Known-Good Compatible Hose
Substitute a known-good approved gas hose for the affected supply.
Expected outcome: If the alarm clears, remove the original hose from service. Troubleshooting can stop after final verification.
7. Inspect Ventilator Gas Inlet Connections
Examine the accessible ventilator inlet for:
- Debris
- Damage
- Loose fittings
- Contamination
- Improperly engaged connectors
Do not probe deeply into the inlet or disassemble internal pneumatic components.
Expected outcome: The ventilator inlet is externally clean, undamaged, and properly connected.
8. Check for Intermittent Supply Conditions
Observe the system while other high-demand equipment uses the same supply area when appropriate.
If the alarm occurs only intermittently, coordinate with Facilities or Medical Gas personnel to investigate infrastructure pressure or flow instability.
Expected outcome: The source remains stable during the test period.
9. Perform Final Functional Verification
Run the approved pre-use check and confirm normal operation on both required gas supplies.
Verify the supply-pressure alarm does not recur.
Expected outcome: Gas supplies remain recognized and stable and the ventilator passes required testing. Troubleshooting can stop.
If the Problem Persists
External pressure, source, hose, connector, and infrastructure causes have been ruled out. The remaining problem may involve an internal pressure sensor, inlet assembly, pneumatic restriction, valve system, or associated electronics.
The Servo-n should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate Getinge service documentation and approved pneumatic test equipment
- Repaired or calibrated only by qualified personnel
Return-to-service testing should include gas-supply recognition, alarm verification, pre-use checks, and ventilator performance testing.
Knowing when to stop external troubleshooting and escalate is proper troubleshooting.
Clinical Use Tip
A normal static wall-pressure reading does not rule out a hose restriction or intermittent supply problem under demand.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported a persistent oxygen supply pressure alarm even though the wall outlet appeared to have normal pressure."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the oxygen supply hose produced the alarm while a known-good hose on the same outlet operated normally."
Resolution
What action was taken.
Example:
"The faulty oxygen hose was replaced, the alarm cleared, the pre-use check passed, and the ventilator was returned to service."
Helpful Details to Include (If Known)
- Air, oxygen, or both affected
- Exact alarm text
- Gas source tested
- Independent source verification
- Hose condition
- Alternate hose result
- Alternate outlet result
- Inlet connector condition
- Intermittent versus continuous alarm
- Final pre-use result
- Final device status
Final Thought
Verify the complete gas path from infrastructure to ventilator before assuming an internal pneumatic fault. Patient safety, independent supply verification, controlled substitution, appropriate escalation, and clear documentation are essential.
That is successful troubleshooting.