GE Healthcare Aisys

Asset Type

Anesthesia Machine

Manufacturer

GE Healthcare

Model

Aisys

What This Guide Helps With

This guide helps troubleshoot a BATTERY LOW alarm on a GE Healthcare Aisys anesthesia machine. This alarm indicates the machine is operating on battery power with limited backup time remaining. The issue may be caused by loss of AC mains power, a loose or damaged power cord, a depleted battery, poor battery charging, or a battery that no longer holds charge reliably.

Because the Aisys supports ventilation, monitoring, and anesthesia delivery, a low battery condition should be treated as a patient safety concern until AC power and battery backup status are confirmed.

Step-by-Step Troubleshooting

1. Ensure Patient Safety First

• Confirm whether the anesthesia machine is connected to an active patient.
• If the machine is in clinical use, notify anesthesia staff immediately.
• Restore AC power immediately if safe to do so.
• Ensure an alternate ventilation and anesthesia plan is available if power cannot be restored.
• Do not ignore the alarm or continue relying on battery operation longer than necessary.

Expected outcome: Patient care continues while AC power is restored or the machine is removed from service.

Why it matters: Loss of battery power during use can interrupt ventilation, monitoring, or anesthesia delivery support.

2. Verify the Reported Alarm and Behavior

• Confirm the displayed alarm is BATTERY LOW.
• Confirm whether the screen indicates the system is on battery power.
• Check whether the display instructs the user to plug in the power cable.
• Ask staff when the alarm appeared and whether the machine had been unplugged or moved.
• Observe whether the alarm occurs during AC mains power failure, while unplugged, after movement, or even when plugged into a wall outlet.

Expected outcome: The BATTERY LOW alarm is confirmed and associated with AC power loss, limited battery charge, or a charging problem.

Why it matters: Confirming the exact alarm prevents confusion with other battery or power-related alarms.

3. Check the AC Power Source

• Verify the anesthesia machine power cord is plugged into a known working hospital-grade outlet.
• Confirm the outlet has power.
• If appropriate, test the outlet using an approved outlet tester or another approved device.
• Check whether the machine recognizes AC mains power after being plugged in.
• Try a different approved outlet if the first outlet is questionable.

Expected outcome: The machine recognizes AC mains power and begins charging the battery.

Why it matters: The most common cause of this alarm is the machine operating on battery because AC power is missing, disconnected, or unreliable.

4. Check the Power Cord and Plug

• Inspect the power cord for loose connections.
• Look for bent or damaged plug blades.
• Check for cuts, crushing, exposed conductors, strain relief damage, or signs of heat.
• Confirm the power cord is fully seated at the wall outlet.
• Confirm the power cord is fully seated at the machine.
• Verify the cord is not being pulled loose during movement or setup.

Expected outcome: The power cord is intact and provides stable AC power to the machine.

Why it matters: A damaged or loose power cord can cause the machine to run on battery even when it appears plugged in.

5. Confirm the Machine Charges While Plugged In

• Leave the Aisys plugged into confirmed AC power.
• Allow the battery to charge.
• Monitor whether the BATTERY LOW alarm clears after sufficient charging time.
• Check whether the machine continues to report battery-related alarms.
• Verify the machine still recognizes AC power during the charging period.

Expected outcome: Battery charge level improves and the BATTERY LOW alarm clears.

Why it matters: A battery that was simply depleted may recover after being connected to AC power.

6. Check for Repeated or Rapid Battery Drain

• Ask staff how long the machine had been unplugged before the alarm occurred.
• Determine whether the machine had recently been stored unplugged.
• Check whether the battery drains quickly after a normal charge period.
• Look for a pattern of repeated BATTERY LOW alarms after short unplugged periods.

Expected outcome: The alarm is explained by normal battery discharge, extended unplugged storage, recent AC power loss, or abnormal battery behavior.

Why it matters: Batteries naturally discharge over time, but rapid battery loss after charging may indicate battery deterioration.

7. Check for Other Battery or Power Alarms

• Look for additional battery or power-related messages.
• Check for alarms such as No battery backup, Battery charge failure, Battery missing, Battery fail, or AC power loss.
• Document any additional alarms exactly as displayed.
• Do not assume this is only a low charge condition if other battery alarms are present.

Expected outcome: No additional battery or charging system alarms are present, or additional faults are identified for escalation.

Why it matters: Additional alarms may point away from simple low charge and toward battery, charging circuit, or power supply failure.

8. Isolate External Power vs Battery Issue

• After confirming the machine is plugged into a working outlet, observe whether it still behaves as though it is on battery.
• If the machine recognizes AC power and charges normally, continue charging and retest.
• If the machine does not recognize AC power, recheck the outlet, power cord, and cord connection before escalating.
• If AC power is recognized but the battery does not recover, suspect weak battery condition or charging issue.

Expected outcome: The issue is narrowed to external AC power, power cord connection, battery charge state, or internal charging/power circuitry.

Why it matters: External power problems should be ruled out before assuming battery or internal failure.

9. Perform Bench Evaluation if the Alarm Persists

• Remove the machine from patient care if the BATTERY LOW alarm does not clear after confirmed charging on AC power.
• Evaluate the machine on the bench away from patient use.
• Verify AC input behavior and battery charge status.
• Use service software to check the battery charge circuit if available and appropriate for your department’s service level.
• Follow facility and manufacturer-approved service procedures.

Expected outcome: The battery charging condition is evaluated without risking patient care.

Why it matters: A persistent BATTERY LOW alarm after charging may indicate a weak battery or charging circuit issue.

10. Replace Battery if Needed

• If the battery does not hold charge, charges abnormally, or repeatedly triggers BATTERY LOW after proper charging, replace the battery according to approved service procedure.
• After replacement, allow the system to charge.
• Retest battery operation.
• Confirm the BATTERY LOW alarm no longer appears during normal AC-powered operation.
• Verify the machine passes required checkout before return to use.

Expected outcome: The battery charges normally and the BATTERY LOW alarm no longer appears under normal AC-powered operation.

Why it matters: A deteriorated battery may not provide reliable backup power during an AC mains failure.

11. Stop When Resolved

• If the alarm clears after restoring AC power or charging the battery, confirm the machine recognizes AC power.
• Confirm no battery-related alarms remain active.
• Verify the machine passes required checkout before clinical use.
• Return the device to service only after normal operation is confirmed.

Expected outcome: The Aisys is safe to return to service with functional AC power and acceptable battery backup status.

Why it matters: Returning the machine too soon may leave staff with unreliable backup power during a later AC mains failure.

If the Problem Persists

If the BATTERY LOW alarm continues after confirming the outlet, power cord, AC connection, and charging time, external and common causes have been ruled out.

Persistent battery low conditions may indicate a failed or weak battery, a battery that is not accepting charge, a battery charge circuit issue, or an internal power management fault.

The device should be removed from service, labeled Out of Service, and sent for repair or bench evaluation. Use service software to check the battery charge circuit if available and appropriate for your department’s service level. Replace the battery if indicated. If the battery and external power checks are good but the condition remains, escalate for internal power system repair.

Clinical Use Tip

Never troubleshoot on an active patient unless clinical staff have confirmed it is safe. If the anesthesia machine is running on battery with limited backup time, restore AC power immediately or move the patient to a backup device first.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"GE Healthcare Aisys anesthesia machine reported BATTERY LOW alarm. Display indicated the unit was on battery power and instructed staff to plug in the power cable."

Cause

What was observed during troubleshooting.

Example:
"Machine was operating on battery power due to AC power loss or insufficient battery charge. External AC power source, power cord connection, and battery charge condition were checked. Persistent alarm after charging may indicate weak battery or battery charge circuit issue."

Resolution

What action was taken.

Example:
"Verified machine was removed from patient use for evaluation. Checked wall outlet, power cord, and AC power connection. Left machine plugged into confirmed AC power to charge battery. Monitored battery alarm status. If alarm cleared and checkout passed, returned device to service. If alarm persisted, labeled device Out of Service for battery replacement and battery charge circuit evaluation."

Helpful Details to Include (If Known)

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

Final Thought

The BATTERY LOW alarm should be treated as a real patient safety concern because the anesthesia machine is already relying on limited backup power. Start with simple external power checks, confirm the machine can charge normally, and escalate when the battery or charge circuit does not recover as expected. Clear documentation helps show whether the issue was caused by power loss, a depleted battery, or a likely internal charging failure.

That is successful troubleshooting.