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What This Guide Helps With
This guide addresses the “Air supply low, GS500 active” alarm, which indicates insufficient compressed air supply. The ventilator may rely on the internal GS500 turbine, resulting in reduced or unstable ventilation performance.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
- Assess the patient immediately
- Provide manual ventilation or switch to a backup ventilator if needed
- Confirm adequate oxygenation and ventilation
2. Verify the Alarm and Behavior
- Confirm the “Air supply low, GS500 active” alarm is displayed
- Observe if it occurs continuously or intermittently
- Check for reduced pressure or volume delivery
3. Check External Air Supply Connection
- Inspect the compressed air hose at the wall outlet and ventilator
- Ensure all fittings are tight and secure
- Look for kinks or partial disconnections
4. Verify Wall Air Supply Pressure
- Confirm pressure is within normal range (typically greater than 3 bar / ~43 psi)
- Test with another device or pressure gauge if available
- Try a different wall outlet to rule out infrastructure issues
5. Inspect Air Hose and Filters
- Check for cracks, leaks, or obstructions in the hose
- Inspect any accessible inlet filters for contamination
- Replace damaged or restricted components
6. Observe GS500 Operation
- Confirm the ventilator is compensating using the internal turbine
- Monitor for reduced maximum flow or pressure capability
- Recognize this as a backup mode, not normal operation
7. Evaluate Ventilation Settings
- Review tidal volume, inspiratory flow, and pressure settings
- Reduce demand if clinically appropriate
- Monitor if alarm clears with reduced load
If the Problem Persists
If proper air supply and connections are confirmed and the alarm remains, external causes have been ruled out. This may indicate internal pneumatic or sensing issues.
- Remove the ventilator from service
- Label the device as Out of Service
- Send for repair or bench evaluation
Clinical Use Tip
Never troubleshoot a ventilator while it is actively supporting a patient. Always transition the patient to a backup device before investigating the issue.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Ventilator alarming ‘Air supply low, GS500 active’ with reduced ventilation performance during use."
Cause
What was observed during troubleshooting.
Example:
"Low central air supply pressure due to loose wall connection."
Resolution
What action was taken.
Example:
"Secured air hose connection, verified adequate pressure, alarm cleared, and ventilator returned to service."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Air supply alarms should always be approached from an external perspective first. Verifying infrastructure, connections, and supply pressure ensures safe and efficient troubleshooting before escalating to internal faults.
That is successful troubleshooting.