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What This Guide Helps With
FRESH GAS LOW !! alarm indicating insufficient fresh gas flow, which can lead to inadequate ventilation delivery and risk of patient hypoventilation.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- If the machine is in use, immediately assess ventilation
- If gas delivery is inadequate, switch to manual ventilation or alternate anesthesia machine
- Ensure continuous patient support
Verify the Reported Alarm and Behavior
- Confirm the FRESH GAS LOW !! alarm is displayed
- Observe when the alarm occurs (startup vs during ventilation)
- Check flowmeter readings for low or zero flow
- Observe bellows movement or lack of volume delivery
- Check for additional related alarms
Check Medical Gas Supply Sources
- Confirm wall gas connections (Oā, Air, NāO if used) are connected
- Verify pipeline pressures are within normal range
- Check backup cylinders are open and adequately pressurized
Check Flowmeter and Gas Settings
- Ensure flowmeters are not set to zero
- Confirm proper gas mixture settings
- Adjust flow controls and observe response
Inspect Fresh Gas Hoses and Connections
- Check hoses for kinks, compression, or blockage
- Ensure all connections are secure
- Look for visible damage or disconnections
Check Breathing Circuit for Leaks or Disconnections
- Inspect all circuit connections
- Check for cracks, holes, or worn seals
- Verify all components are properly connected
Perform a Leak Test
- Run a system leak test per standard procedure
- Verify results are within acceptable limits
Stop When Resolved
- Confirm normal gas flow is restored
- Verify stable ventilation
- Return device to service if functioning properly
If the Problem Persists
If all external gas sources, hoses, and circuit issues have been ruled out and the alarm continues, an internal flow regulation or sensing failure is likely.
- Remove the device from service
- Label Out of Service
- Send for repair or bench evaluation
Clinical Use Tip
Never troubleshoot gas supply issues on an active patient. Always move the patient to a backup device before continuing.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Unit displayed FRESH GAS LOW !! alarm with low delivered tidal volume during ventilation."
Cause
What was observed during troubleshooting.
Example:
"Kinked oxygen supply hose restricting fresh gas flow to the machine."
Resolution
What action was taken.
Example:
"Repositioned and replaced hose, verified normal gas flow and cleared alarm. Performed leak test and returned unit to service."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Fresh gas flow is essential for safe anesthesia delivery. Always begin with supply and external causes before considering internal faults, and prioritize patient safety at every step.
That is successful troubleshooting.