GE Healthcare Aisys

Asset Type

Anesthesia Machine

Manufacturer

GE Healthcare

Model

Aisys

What This Guide Helps With

This guide helps troubleshoot a GE Healthcare Aisys anesthesia machine reporting VENT AIRWAY OVERPRESS SIGNAL FAIL. This condition may appear with a Vent Fail. Monitoring Only. message and can stop normal ventilator function.

The alarm indicates that the ventilator system detected an airway overpressure signal disagreement. The machine may be seeing a high airway overpressure signal even though measured airway pressure and manifold pressure are not high enough to match a true overpressure condition.

Step-by-Step Troubleshooting

1. Ensure Patient Safety First

• Do not rely on the internal ventilator if the machine is displaying Vent Fail, Monitoring Only, or any active ventilator failure condition.
• Remove the anesthesia machine from active patient use if ventilation cannot be trusted.
• Have anesthesia staff ventilate the patient manually or transfer ventilation to a backup anesthesia machine or approved alternate device as clinically appropriate.
• Do not continue using the machine for normal automatic ventilation while this alarm is active.

2. Verify the Reported Alarm and Behavior

• Confirm the exact alarm reported is VENT AIRWAY OVERPRESS SIGNAL FAIL.
• Confirm whether the screen also displays Vent Fail. Monitoring Only.
• Ask when the alarm occurred: during startup, during ventilation, intermittently during a case, after a mode change, or after a reboot.
• Record whether the ventilator stopped normal function or remained in monitoring-only operation.

3. Understand What the Alarm Means

• Interpret this as a ventilator pressure signal disagreement rather than a simple high-pressure circuit event.
• The system may be detecting a high airway overpressure signal while the measured airway pressure and manifold pressure are below the expected overpressure range.
• This can point toward a pressure signal, sensing, ventilator interface, or internal electronics issue if the condition repeats.

4. Inspect the Patient Circuit and Breathing System

• Check for kinked breathing hoses.
• Check for blocked inspiratory or expiratory limbs.
• Inspect the filter or HME for blockage, moisture, or contamination.
• Check the patient connection for obstruction or incorrect assembly.
• Verify the breathing circuit is assembled correctly and fully seated.
• Look for condensation, damaged tubing, pinched hoses, or recently changed accessories.

5. Check Airway Pressure Line and Sampling Connections

• Inspect externally accessible airway pressure sensing tubing and related connections.
• Look for loose pressure tubing, disconnected sensing lines, cracked tubing, blocked ports, or fluid contamination.
• Verify breathing system components are connected correctly and not interfering with the pressure sensing path.
• Correct any obvious external pressure signal problem before continuing.

6. Check for Recent Setup or Accessory Changes

• Ask staff whether the alarm started after a circuit change, filter change, breathing system cleaning, reassembly, service, transport, or power interruption.
• Inspect any recently changed breathing circuit components.
• Correct obvious setup issues and repeat the appropriate checkout before considering the unit ready for use.

7. Reboot the System Only When Safe

• Only reboot after the patient is no longer dependent on the machine and clinical staff confirm it is safe.
• Power the Aisys down and restart it.
• Allow the system to complete startup checks.
• Observe whether the alarm returns.

8. Perform Checkout if the Alarm Clears

• If the alarm clears after reboot, perform the normal anesthesia machine checkout required by your facility.
• Verify ventilator operation, leak test results, circuit compliance testing if applicable, pressure readings, bag/vent switch operation, and alarm function.
• Do not treat a reboot alone as a completed repair unless checkout and functional verification pass.

9. Test for Repeat Failure

• Run the machine long enough to confirm the alarm does not return.
• Use an approved test lung or facility-approved test method.
• Watch for repeat VENT AIRWAY OVERPRESS SIGNAL FAIL, Vent Fail messages, Monitoring Only status, abnormal airway pressure readings, or failure during ventilation mode changes.

10. Escalate to Service Mode Evaluation if the Alarm Repeats

• If the alarm repeats after external checks and reboot, remove the unit from service.
• Request bench evaluation by qualified Clinical Engineering or authorized service personnel.
• The listed follow-up action is to check the airway pressure signal in Service Mode.
• Do not continue resetting the machine and returning it to clinical use if the ventilator failure repeats.

11. Stop When Resolved

• If the alarm clears, the machine passes checkout, and functional ventilation testing passes, return the unit to service according to facility policy.
• If the alarm repeats or ventilator function remains questionable, keep the unit out of service.
• Document the alarm, external checks, reboot result, checkout result, functional test result, and final device status.

If the Problem Persists

If the VENT AIRWAY OVERPRESS SIGNAL FAIL alarm continues after external circuit checks, pressure connection checks, setup review, and reboot, common external causes have been ruled out.

A persistent Vent Fail or Monitoring Only condition strongly suggests an internal ventilator pressure signal, sensing, interface, or control issue.

• Remove the device from service.
• Label it Out of Service.
• Send it for repair or bench evaluation.
• Have qualified personnel evaluate the airway pressure signal through Service Mode checks.

Clinical Use Tip

Never troubleshoot this alarm on an active patient. If Vent Fail or Monitoring Only appears, move the patient to a backup device or have anesthesia staff maintain ventilation manually before troubleshooting the Aisys.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"GE Healthcare Aisys anesthesia machine reported VENT AIRWAY OVERPRESS SIGNAL FAIL with Vent Fail. Monitoring Only displayed. Staff reported ventilator fault and machine could not be trusted for normal ventilation."

Cause

What was observed during troubleshooting.

Example:
"External breathing circuit, filter, hose, and pressure-related connections inspected. Alarm indicates high airway overpressure signal disagreement while measured pressures were not consistent with a true overpressure condition."

Resolution

What action was taken.

Example:
"Removed unit from patient use. Verified alarm condition, inspected external circuit and pressure connections, rebooted system, and completed checkout and functional ventilation testing. Unit returned to service after passing testing, or labeled Out of Service for bench evaluation if alarm repeated."

Helpful Details to Include (If Known)

• Alarm behavior
• Accessories swapped
• Power behavior
• Environmental factors
• Indicator lights
• Final device status

Final Thought

Aisys ventilator failure alarms should be handled with patient safety first, then logical troubleshooting. Start with the breathing circuit, pressure connections, recent setup changes, and reboot only when safe. If the alarm repeats after external causes are ruled out, remove the anesthesia machine from service and escalate for proper evaluation.

That is successful troubleshooting.