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What This Guide Helps With
This guide addresses situations where a Fabius anesthesia machine shows low oxygen pressure or the O₂ flush function is not performing correctly. The focus is on simple, external, and verifiable causes first—such as supply issues, hoses, and flow controls—before assuming internal machine failure.
Step-by-Step Troubleshooting
Verify Oxygen Supply
- Check that the oxygen cylinder or pipeline supply is full and turned on.
- Confirm the correct pressure at the machine inlet using the pressure gauge.
Why it matters: Low or empty supply is the most common cause of low oxygen pressure alarms.
Inspect Hoses and Connections
- Visually inspect the oxygen hose from the source to the machine.
- Ensure all connections are tight and free of kinks, cracks, or leaks.
Why it matters: Even small leaks can reduce pressure and prevent the O₂ flush from functioning properly.
Check the Oxygen Flowmeter
- Verify that the flowmeter knob is in the correct position.
- Ensure the flowmeter tube and bobbin move freely.
Why it matters: Obstructions or misalignment can prevent proper flow and pressure.
Test O₂ Flush Function
- Press the O₂ flush button briefly. Observe whether the oxygen flows rapidly into the circuit.
- If the flush is weak or absent, note any unusual sounds or behavior.
Why it matters: A faulty flush valve or blocked pathway may indicate internal components need servicing.
Check for Machine Alarms or Messages
- Review the display panel for any error messages related to oxygen supply or pressure.
- Follow any suggested external corrective actions listed by the machine.
Power Cycle the Machine
- Turn the machine off and back on per manufacturer instructions.
- Confirm if the low oxygen pressure alarm persists.
Why it matters: Some sensors or valves may reset after power cycling.
If the Problem Persists
All external causes have been ruled out.
- Remove the machine from service and label it Out of Service.
- Escalate to Drager service or a qualified repair bench.
Reminder: Knowing when to stop and escalate is proper troubleshooting.
Clinical Use Tip
- Never troubleshoot oxygen issues on a patient actively receiving anesthesia.
- Ensure a backup oxygen source or machine is available before performing any checks.
- Only operate the machine with patients once proper oxygen delivery is confirmed.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Low oxygen pressure alarm and weak O₂ flush observed."
Cause
What was observed during troubleshooting.
Example:
"Oxygen cylinder was low and supply hose had a minor kink reducing flow."
Resolution
What action was taken.
Example:
"Replaced cylinder, straightened hose, verified O₂ flush function; machine returned to service."
Helpful Details to Include
- Supply pressure at machine inlet
- Oxygen cylinder status (full/empty)
- Condition of hoses and connections
- Alarm type and behavior
- O₂ flush response (strong/weak/absent)
- Final machine status after troubleshooting
Final Thought
Always prioritize patient safety by confirming oxygen delivery first. Use a logical, stepwise approach, ruling out external factors before assuming internal failure. Document each step clearly in CCR format to ensure accurate records and aid future troubleshooting.
That is successful troubleshooting.