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What This Guide Helps With
This guide helps troubleshoot the ACB MICROPROC ERROR alarm on a GE Healthcare Aisys anesthesia machine. This alarm indicates a system malfunction caused by an unexpected Anesthesia Control Board microcontroller exception. It may affect system control, startup behavior, monitoring, or normal anesthesia machine operation.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Do not trust the anesthesia machine for active patient support while this alarm is unresolved.
- Remove the Aisys from patient use if the alarm occurs during setup, checkout, standby, or clinical operation.
- If the machine is connected to a patient, have anesthesia staff transition to another anesthesia machine or approved backup ventilation method.
- Do not continue clinical use with an unresolved ACB MICROPROC ERROR.
Verify the Reported Alarm and Behavior
- Confirm the exact alarm displayed is ACB MICROPROC ERROR.
- Note whether the alarm appears during power-up, system checkout, standby, active use, or after reboot.
- Check for associated behavior such as a System Malfunction message, failed startup, frozen display, unexpected restart, loss of normal machine function, or repeated alarm after cycling power.
- Document whether the alarm is constant or intermittent.
Remove the Device From Clinical Use Before Resetting
- Confirm the machine is not supporting a patient before attempting a reboot.
- Make sure anesthesia staff has another safe means of ventilation and anesthetic delivery available.
- Do not power cycle the machine during active patient care unless directed by clinical leadership as part of an emergency response.
Perform a Controlled Reboot
- Power the Aisys down using the normal shutdown method when possible.
- Wait briefly, then power the system back on.
- Observe the startup sequence and check whether the ACB MICROPROC ERROR returns.
- If the alarm clears, run the required checkout or operational verification before returning the machine to service.
- If the alarm returns, do not continue trying to clear it repeatedly for clinical use.
Check External Power Stability
- Verify the machine is connected to a known-good AC outlet.
- Confirm the power cord is fully seated at the wall and at the machine.
- Look for loose plugs, damaged cords, tripped outlets, or signs of power interruption.
- Avoid questionable power strips or non-approved extension cords.
- Document whether the alarm occurred after a power interruption or unexpected shutdown.
Inspect for Obvious External or Environmental Issues
- Check for liquid intrusion, physical damage, recent impact, burning smell, unusual heat, loose external modules, or recent service activity.
- Ask clinical staff whether the machine had repeated unexpected shutdowns, freezes, or resets.
- Do not open the machine or perform internal board-level troubleshooting during clinical-area checks.
- Document any visible damage or abnormal condition before sending the unit for repair.
Repeat Startup Observation
- After confirming power and basic external conditions, restart the system again only if appropriate and safe.
- Watch whether the alarm returns immediately or only after a certain point in startup.
- Note whether the failure is reproducible or intermittent.
- A repeatable ACB MICROPROC ERROR after reboot strongly supports an internal controller issue.
Determine Whether the Fault Is Device-Related
- If the alarm occurred after a power interruption and clears after reboot, document the power-related condition and complete required checkout.
- If there is evidence of liquid, impact, heat, or contamination, remove the unit from service for evaluation.
- If the alarm returns after reboot with stable power and no external cause found, treat the issue as a likely internal Anesthesia Control Board fault.
If the Problem Persists
If the ACB MICROPROC ERROR returns after reboot and basic external checks, common external causes have been ruled out. A persistent alarm strongly indicates an internal Anesthesia Control Board failure or processor-level fault.
- Remove the anesthesia machine from service.
- Label it Out of Service.
- Do not return it to clinical use.
- Send the device for repair or bench evaluation.
- Escalate according to facility process for GE Healthcare anesthesia machine service.
- The likely corrective action may involve Anesthesia Control Board evaluation or replacement.
Clinical Use Tip
Never troubleshoot an ACB MICROPROC ERROR on an active patient. Move the patient to a backup anesthesia machine or approved backup ventilation method first. An anesthesia machine with an unresolved controller fault should not be relied on for patient care.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"GE Healthcare Aisys anesthesia machine displayed ACB MICROPROC ERROR with System Malfunction message during startup/system checkout and was not cleared for use."
Cause
What was observed during troubleshooting.
Example:
"Confirmed ACB MICROPROC ERROR. External power connection and basic external condition were checked. Alarm returned after controlled reboot, indicating likely internal Anesthesia Control Board microcontroller fault."
Resolution
What action was taken.
Example:
"Removed anesthesia machine from service and labeled Out of Service. Reboot attempted and alarm persisted. Sent for repair/bench evaluation with suspected Anesthesia Control Board failure."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
The ACB MICROPROC ERROR should be treated as a serious anesthesia machine system malfunction. Start with patient safety, confirm the exact alarm, attempt a controlled reboot only when the device is not supporting a patient, and rule out obvious external power or damage issues. If the alarm returns, escalation is appropriate because the fault points toward an internal Anesthesia Control Board problem. Clear documentation protects patient safety, supports repair decisions, and helps identify repeat failures.
That is successful troubleshooting.