GE Healthcare Carestation 600 Series

Asset Type

Anesthesia Machine

Manufacturer

GE Healthcare

Model

Carestation 600 Series

What This Guide Helps With

Troubleshooting high airway pressure caused by circuit obstruction, accessory restriction, incorrect settings, expiratory-flow problems, or breathing-system assembly issues.

Step-by-Step Troubleshooting

1. Ensure Patient Safety First

Do not perform extended troubleshooting while the Carestation 600 Series is supporting an active patient.

If a high airway pressure alarm occurs during a procedure:

• Notify the anesthesia provider immediately.
• Have the provider assess the patient, airway, endotracheal tube, and clinical condition.
• Prepare another verified anesthesia machine or an approved backup ventilation method.
• Transfer ventilation when directed by the anesthesia provider.
• Maintain appropriate independent patient monitoring.

Expected outcome: Patient care no longer depends on equipment with unresolved elevated airway pressure.

Continue Clinical Engineering troubleshooting only after the anesthesia machine has been removed from active patient use.

2. Confirm the Exact Alarm Condition

Record the complete alarm message and determine:

• Whether the pressure reaches the configured high-pressure limit.
• Whether pressure remains elevated between breaths.
• Whether the alarm occurs during inspiration, expiration, or both.
• Whether the issue occurs in mechanical ventilation, manual ventilation, or both.
• Whether the issue began after changing the circuit, accessory, breathing bag, absorber, or ventilation settings.

Review the displayed pressure waveform and alarm history when available.

Expected outcome: The timing and pattern of the pressure increase are identified.

3. Verify Ventilation and Alarm Settings

Confirm that the selected ventilation mode and settings are appropriate for the test setup.

Check:

• Tidal volume or inspiratory pressure
• Respiratory rate
• Inspiratory time or I ratio
• PEEP setting
• Fresh-gas flow
• High airway pressure alarm limit
• Patient-type or ventilation configuration

An alarm limit set too close to the normal peak inspiratory pressure may create repeated alarms even when the machine is functioning normally.

Expected outcome: Settings and alarm limits are appropriate and not independently causing the reported condition.

If correcting an inappropriate setting resolves the alarm and the device passes checkout, stop troubleshooting.

4. Inspect the Patient Breathing Circuit

Remove the circuit from clinical use and inspect its full length.

Look for:

• Kinked or compressed tubing
• Tubing trapped under equipment
• Internally collapsed circuit limbs
• Incorrectly assembled connectors
• Obstructed filters
• Water accumulation
• Damaged or incompatible breathing circuits
• Caps or packaging materials left in a connection

Replace the circuit with a known-good compatible circuit when its condition is uncertain.

Expected outcome: Gas can move freely through the inspiratory and expiratory limbs.

If replacing the circuit resolves the alarm and the machine passes checkout, stop troubleshooting.

5. Remove External Airway Accessories

Temporarily remove nonessential external components from the test circuit, including:

• Heat and moisture exchangers
• Bacterial or viral filters
• Catheter mounts
• Flexible extensions
• Nebulizer adapters
• Sampling adapters
• Additional connectors

Inspect each accessory for blockage, contamination, moisture, or an incorrect orientation.

Reconnect only the components required for the controlled test.

Expected outcome: Excessive resistance caused by an external accessory is eliminated.

If removing or replacing an accessory resolves the problem, document the affected component and stop troubleshooting after successful testing.

6. Check the Test Lung or Breathing Bag

Connect a known-good test lung appropriate for anesthesia-machine testing.

Confirm that:

• The test lung is not obstructed.
• Its compliance is suitable for the selected settings.
• The breathing bag is not twisted, compressed, or improperly installed.
• No test plug or cap is restricting the circuit.

A stiff, undersized, or obstructed test lung can produce high airway pressure without a machine failure.

Expected outcome: The anesthesia machine is tested against a known and repeatable load.

7. Inspect the Adjustable Pressure-Limiting Valve

When testing manual ventilation, inspect the adjustable pressure-limiting valve for:

• An excessively high pressure setting
• Restricted movement
• Contamination around the external control
• Incorrect operating position
• Physical damage

Do not disassemble the valve beyond procedures authorized for Clinical Engineering.

Set the valve appropriately for the controlled test and observe whether pressure releases normally.

Expected outcome: Pressure can be relieved during manual ventilation.

If the valve does not operate normally, remove the machine from service for repair evaluation.

8. Inspect the Breathing-System Assembly

Verify that externally removable breathing-system components are properly installed and secured.

Check:

• Absorber canister installation
• Breathing-system seating
• Inspiratory and expiratory valve covers
• Circuit-port connections
• Bag-arm connection
• Condensate drains or water traps
• Seals and gaskets visible during normal removal
• Components recently removed for cleaning or maintenance

Look for misalignment, contamination, trapped material, moisture, or visibly damaged seals.

Expected outcome: The breathing system is correctly assembled without an obvious flow restriction.

9. Check Inspiratory and Expiratory Valve Movement

Using only approved external inspection methods, observe the inspiratory and expiratory valve discs during controlled ventilation.

Look for:

• A valve disc that does not move.
• A disc that sticks or closes slowly.
• Moisture or residue around the valve.
• A warped, cracked, or incorrectly seated disc.
• An incorrect valve-cover installation.

Do not continue using the machine if valve operation is inconsistent.

Expected outcome: Both unidirectional valves move freely and support proper gas flow.

If cleaning or replacing a user-removable component is permitted by facility procedure, complete the action and repeat checkout. Otherwise, escalate for repair.

10. Evaluate the Expiratory Path

High pressure may occur when gas enters the circuit normally but cannot exit without restriction.

Inspect the accessible expiratory path for:

• Kinked expiratory tubing
• Saturated or obstructed filters
• Water accumulation
• Improperly installed expiratory components
• Restricted breathing-system outlets
• Accessories connected to the wrong port

Pay particular attention when pressure does not return to baseline between breaths.

Expected outcome: Exhaled gas has an unrestricted path through the breathing system.

11. Inspect the Scavenging Connection

Check the anesthetic gas scavenging system for:

• Kinked or crushed hoses
• An obstructed transfer hose
• Incorrect wall-suction connection
• Excessive suction
• Restricted scavenging components
• Improper hose routing

A scavenging-system problem may affect breathing-system pressure and must be evaluated before assuming an internal ventilator failure.

Expected outcome: Waste-gas evacuation operates without creating abnormal pressure or restriction.

12. Compare Manual and Mechanical Ventilation

Using a verified test lung, determine whether the high-pressure condition occurs during:

• Manual ventilation only
• Mechanical ventilation only
• Both manual and mechanical ventilation

Expected outcome: The failure is narrowed to a specific operating path.

A problem in both modes suggests a common circuit, accessory, valve, or breathing-system restriction.

A problem limited to manual ventilation may involve the bag circuit or adjustable pressure-limiting valve.

A problem limited to mechanical ventilation may require ventilator or electronically controlled valve evaluation.

Do not proceed into internal pneumatic or electronic repair unless trained and authorized.

13. Perform the Full System Checkout

After correcting any visible issue:

• Reassemble the breathing system.
• Install a known-good circuit and test lung.
• Perform the complete manufacturer-required system checkout.
• Verify manual ventilation.
• Verify mechanical ventilation.
• Confirm normal pressure-waveform behavior.
• Confirm pressure returns to the expected baseline.
• Confirm that the high-pressure alarm activates appropriately when intentionally tested.
• Confirm that no other alarms or checkout failures remain.

GE HealthCare identifies checkout procedures and breathing-system leak troubleshooting as core service competencies for the Carestation 600 Series.

Expected outcome: The machine completes checkout and operates normally across applicable ventilation modes.

Do not return the device to service based only on the disappearance of the alarm.

If the Problem Persists

If the circuit, accessories, test lung, settings, breathing-system assembly, valves, and scavenging connections have been checked, the common external causes have been ruled out.

The problem may involve an internal pressure sensor, flow-control component, ventilator valve, expiratory valve, pneumatic pathway, or control-system fault.

The device should be:

• Removed from service
• Labeled Out of Service
• Sent for qualified bench evaluation or GE HealthCare service
• Tested according to the applicable service documentation before being returned to clinical use

Do not perform unauthorized internal pneumatic or board-level repairs. Knowing when to stop and escalate is proper troubleshooting.

Clinical Use Tip

Never test airway-pressure alarms or breathing-system restrictions while the machine is connected to an active patient. Move the patient to verified equipment before conducting controlled testing.

Maintain therapy continuity with an approved backup ventilation method and appropriate independent patient monitoring.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Clinical staff reported repeated high airway pressure alarms during mechanical ventilation on the GE Healthcare Carestation 600 Series."

Cause

What was observed during troubleshooting.

Example:
"Inspection found a moisture-saturated bacterial filter restricting flow in the expiratory side of the patient circuit."

Resolution

What action was taken.

Example:
"Replaced the restricted filter, installed a verified test circuit, completed system checkout, and confirmed normal airway pressure and alarm operation."

Helpful Details to Include (If Known)

• Complete alarm message recorded
• Alarm history reviewed
• Ventilation mode documented
• Peak airway pressure recorded
• Pressure alarm limit recorded
• Pressure returned to baseline between breaths
• Patient circuit inspected or replaced
• Filters and accessories removed or exchanged
• Known-good test lung used
• APL valve checked
• Inspiratory and expiratory valves inspected
• Absorber and breathing system reseated
• Scavenging hose and suction checked
• Manual ventilation tested
• Mechanical ventilation tested
• Full system checkout completed
• Unusual sounds, heat, odor, or physical damage documented
• Environmental factors documented
• Indicator lights documented
• Final device status recorded

Final Thought

High airway pressure may result from the patient, circuit, accessories, settings, scavenging system, or anesthesia machine. Patient safety comes first, followed by logical isolation of external causes and appropriate escalation when the fault cannot be safely resolved. Clear CCR documentation preserves what was reported, what was found, and why the device was returned to service or sent for repair.

That is successful troubleshooting.