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What This Guide Helps With
Troubleshooting restricted, inadequate, or excessive waste-gas evacuation caused by hoses, connections, receiving-system suction, flow adjustment, or external scavenging components.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
Do not perform extended scavenging troubleshooting while the Carestation 600 Series is supporting an active patient.
If waste-gas evacuation is questionable during a procedure:
- Notify the anesthesia provider immediately.
- Confirm that ventilation, gas delivery, and patient monitoring remain functional.
- Minimize personnel exposure to waste anesthetic gas according to facility policy.
- Transfer the patient to another verified anesthesia machine when clinically appropriate.
- Follow the facility’s anesthesia-equipment failure procedure.
Expected outcome: Patient care continues safely without relying on equipment with unresolved scavenging performance.
Continue troubleshooting only after the machine is removed from active patient use.
2. Confirm the Exact Failure Condition
Determine whether the reported problem involves:
- Weak or absent evacuation
- Excessive evacuation or suction
- A restricted or collapsed scavenging hose
- An unusual scavenging flow indication
- An anesthetic odor near the machine
- A fault that occurs only in one operating room
- A problem that follows the machine between locations
Record any displayed message, indicator position, abnormal sound, or odor.
Expected outcome: The failure is clearly identified as inadequate evacuation, excessive suction, restriction, disconnection, or an intermittent condition.
3. Inspect the Scavenging Hose
Trace the scavenging hose from the anesthesia machine to the wall connection or waste-gas receiving system.
Check for:
- Kinks
- Compression beneath equipment
- Tight bends
- Cracks or splits
- Loose fittings
- Internal blockage
- Incorrect hose routing
- A hose stretched tightly between connections
Straighten the hose and reconnect any loose fittings. Replace visibly damaged or questionable hoses with an approved compatible hose.
Expected outcome: The scavenging pathway is open, correctly routed, and securely connected.
If normal evacuation returns, complete an operational check and stop troubleshooting.
4. Verify the Wall AGSS Connection
Confirm that the scavenging hose is connected to the correct wall outlet and that the connector is fully seated.
Inspect the terminal connection for:
- Incomplete engagement
- A damaged connector
- Debris or contamination
- A loose wall receptacle
- Connection to an incorrect gas terminal
Disconnect and reconnect the fitting when safe to do so.
Expected outcome: The hose is securely attached to the designated waste anesthetic gas evacuation outlet.
5. Check the Facility Evacuation Source
Determine whether the wall AGSS or central waste-gas evacuation system is operating.
When permitted by facility procedures:
- Test the outlet with an approved flow-testing device.
- Compare operation with a known-good outlet.
- Ask Facilities whether the central evacuation system has an active fault.
- Determine whether other anesthesia machines in the same area have similar symptoms.
Do not use uncontrolled suction or improvised test methods.
Expected outcome: The wall outlet provides evacuation within the facility’s specified operating range.
If the outlet is not functioning correctly, refer the issue to Facilities and document that the anesthesia machine was not the source of the failure.
6. Inspect the Scavenging Interface Externally
Examine the machine’s scavenging interface and visible external components for:
- Disconnected tubing
- Cracked fittings
- Obstructed openings
- Damaged reservoir components
- Contamination
- Incorrect assembly
- Components installed backward or incompletely
Do not disassemble internal valves or regulated assemblies unless authorized and trained to perform the manufacturer’s service procedure.
Expected outcome: External scavenging components are correctly assembled, unobstructed, and undamaged.
7. Check for Excessive or Insufficient Suction
Observe the scavenging system while the machine is connected to the verified evacuation source.
Look for indications that:
- Suction is too low to evacuate waste gas.
- Suction is pulling excessively on the breathing system.
- A reservoir component remains continuously collapsed or overfilled.
- The interface does not respond when gas flow changes.
If an externally accessible flow adjustment is present, verify that it has not been inadvertently moved. Do not adjust regulated components without the proper test equipment and service documentation.
Expected outcome: Evacuation is sufficient to remove waste gas without applying inappropriate suction to the breathing system.
8. Remove External Accessories From the Path
Temporarily remove or substitute externally attached scavenging accessories, adapters, extension hoses, or nonstandard connectors.
Test using the shortest approved configuration available.
Expected outcome: A restrictive or incompatible accessory is identified or ruled out.
If removing an accessory restores normal operation, replace the defective component and stop troubleshooting.
9. Compare With Known-Good Components
Substitute one component at a time using verified compatible parts:
- Scavenging hose
- Wall connector
- External adapter
- Reservoir or interface accessory, when applicable
Do not exchange multiple components simultaneously because this makes the actual cause difficult to identify.
Expected outcome: The defective external component is isolated without unnecessary internal repair.
10. Perform an Off-Patient Operational Check
After correcting any external problem:
- Reconnect the scavenging system.
- Power on the Carestation.
- Complete the required pre-use checkout.
- Operate the machine with an approved test lung.
- Confirm that ventilation remains stable.
- Verify that waste-gas evacuation is functioning without excessive suction.
- Check for abnormal odor, sound, or scavenging behavior.
The Carestation 600 Series user reference documentation and related support materials are available through GE HealthCare’s perioperative equipment resources.
Expected outcome: The machine passes its checkout and scavenging performance remains stable throughout functional testing.
If the device passes all required testing, return it to service according to facility policy.
If the Problem Persists
If the hose, connections, wall outlet, accessories, and external scavenging components have been verified, the failure may involve an internal interface valve, relief component, flow-control assembly, damaged internal tubing, or another internal pneumatic fault.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for authorized repair or bench evaluation
- Tested according to manufacturer procedures before being returned to clinical use
Do not continue operating the machine with uncertain waste-gas evacuation. Knowing when to stop and escalate is proper troubleshooting.
Clinical Use Tip
Never perform extended scavenging troubleshooting while the anesthesia machine is supporting an active patient. Establish alternate ventilation and anesthesia delivery before disconnecting hoses or testing evacuation performance.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Anesthesia staff reported weak waste-gas evacuation and anesthetic odor near the Carestation 600 Series during setup."
Cause
What was observed during troubleshooting.
Example:
"Inspection found the scavenging hose sharply kinked behind the machine, restricting flow to the wall AGSS outlet."
Resolution
What action was taken.
Example:
"Rerouted and secured the scavenging hose, verified wall evacuation, completed the machine checkout with a test lung, and returned the unit to service."
Helpful Details to Include (If Known)
- Exact displayed message or reported symptom
- Scavenging hose inspected
- Hose or adapter replaced
- Wall AGSS outlet tested
- Known-good outlet used
- Other machines affected
- Anesthetic odor reported
- Reservoir or flow-indicator behavior
- Unusual sound, heat, or physical damage
- Machine checkout result
- Final device status
Final Thought
Scavenging faults require a logical separation of machine problems from hose, accessory, and facility evacuation issues. Protect the patient and staff first, verify external causes systematically, and escalate internal faults appropriately. Clear CCR documentation preserves the troubleshooting history and supports safe return-to-service decisions.
That is successful troubleshooting.