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What This Guide Helps With
Troubleshooting absent bellows movement or ventilation caused by circuit leaks, improper assembly, gas-supply problems, settings, connections, or external breathing-system faults.
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 the bellows stops moving or mechanical ventilation is not occurring during a procedure:
- Notify the anesthesia provider immediately.
- Begin an approved alternative ventilation method.
- Move the patient to another verified anesthesia machine when clinically appropriate.
- Maintain independent oxygenation, ventilation, and patient monitoring.
- Follow the facility’s anesthesia-machine failure procedure.
Expected: Patient ventilation no longer depends on equipment with an unresolved ventilator problem.
Continue troubleshooting only after the machine has been safely removed from patient use.
2. Confirm the Exact Failure Condition
Determine whether:
- The bellows does not rise during exhalation.
- The bellows rises but does not descend during inspiration.
- The ventilator does not begin cycling.
- The ventilator cycles inconsistently.
- Manual ventilation works, but mechanical ventilation does not.
- The problem began after circuit, absorber, bellows, or flow-sensor service.
- A specific alarm or advisory message is displayed.
Record the selected ventilation mode, respiratory rate, tidal volume or pressure setting, fresh-gas flow, and observed bellows behavior.
Expected: The failure is clearly defined before components are changed.
3. Verify the Machine Is in Mechanical Ventilation Mode
Confirm that:
- The bag-to-ventilator selector is fully placed in the ventilator position.
- A mechanical ventilation mode is selected.
- Ventilation has been started or confirmed at the controls.
- The respiratory rate is not set unusually low.
- Tidal volume, inspiratory pressure, and other required settings are appropriate for testing.
A selector left in bag mode can prevent expected ventilator and bellows operation.
Expected: The machine enters mechanical ventilation and the bellows begins cycling.
If ventilation starts normally, complete a full checkout before returning the machine to service and stop troubleshooting.
4. Verify Pipeline and Cylinder Gas Availability
Check the displayed supply pressures and confirm that the required medical-gas pipeline connections are secure.
Inspect for:
- Disconnected or partially connected hoses
- Closed cylinder valves when cylinders are being used
- Empty backup cylinders
- Pipeline pressure alarms
- Damaged hose fittings
- A facility gas-supply problem
The ventilator requires an adequate drive-gas supply to operate correctly.
Expected: Gas pressures are within the facility and manufacturer-approved operating range, with no active supply alarms.
If gas supply is restored and ventilation operates normally, complete the machine checkout and stop.
5. Inspect the Patient Breathing Circuit
Remove the machine from patient use and inspect the complete breathing circuit.
Confirm that:
- Inspiratory and expiratory limbs are connected to the correct ports.
- The patient Y-piece is connected to a test lung or approved test fixture.
- Circuit hoses are not disconnected, split, loose, or punctured.
- Connections at filters, adapters, humidification components, and sampling fittings are secure.
- The reservoir bag and bag arm connections are intact.
- No circuit component is severely kinked, blocked, or incorrectly installed.
Because the Carestation 600 Series uses an ascending bellows, a major breathing-circuit disconnection or leak may prevent the bellows from filling normally.
Expected: The circuit is complete, unobstructed, and capable of holding pressure.
Replace damaged or questionable disposable components and repeat the ventilation test.
6. Check the Adjustable Pressure-Limiting Valve and Bag Assembly
Verify that the adjustable pressure-limiting valve moves normally and is not visibly damaged or obstructed.
Inspect the reservoir bag for:
- Tears or punctures
- Loose attachment
- Incorrect size
- Hardened or deteriorated material
- A missing or damaged bag-arm connection
Although the adjustable pressure-limiting valve primarily affects manual ventilation, abnormalities in the bag circuit can help identify a broader breathing-system leak or assembly problem.
Expected: Manual ventilation with a test lung produces pressure and the reservoir bag fills and empties normally.
If manual ventilation is also unsuccessful, focus on a breathing-system leak, obstruction, or assembly problem before suspecting an internal ventilator failure.
7. Inspect the Bellows Assembly Externally
With the machine off patient and depressurized, visually inspect the bellows housing.
Look for:
- Bellows that are folded, twisted, collapsed, or separated from the lower rim
- Cracks, tears, or deterioration
- A bellows housing that is not seated or secured
- A displaced bellows top plate
- Moisture or contamination inside the visible assembly
- Damage following cleaning or recent service
Do not remove or internally rebuild the bellows assembly unless authorized, trained, and following approved service documentation.
Expected: The bellows is correctly seated, physically intact, and able to move freely within its housing.
If visible damage is found, remove the machine from service and send it for repair.
8. Verify the Breathing-System Components Are Properly Installed
Inspect externally accessible breathing-system components that may have been removed for cleaning or service.
Confirm that:
- The absorber canister is correctly installed and latched.
- The breathing system is fully seated.
- Drain plugs and condensate collection components are secure.
- Flow sensors are installed in their correct positions and orientations.
- Inspiratory and expiratory valve assemblies appear correctly seated.
- All removable covers and seals are properly installed.
A missing, loose, or incorrectly installed component can create a significant leak and prevent the bellows from rising.
Expected: All breathing-system components are present, correctly oriented, and securely installed.
If reseating a component resolves the problem, run the complete system checkout and stop.
9. Inspect the Flow Sensors and Associated Connections
Check the inspiratory and expiratory flow sensors for:
- Incorrect installation
- Reversed positioning
- Loose electrical or pneumatic connections
- Excessive moisture
- Visible contamination
- Cracks or physical damage
Allow wet components to dry according to approved facility and manufacturer procedures. Replace visibly damaged sensors with compatible known-good components when permitted.
Expected: Flow sensors are clean, dry, correctly installed, and recognized without related alarms.
If the ventilator begins cycling normally, perform the required calibration or checkout before returning the machine to service.
10. Check the Scavenging Connection for Severe Restriction
Inspect the anesthetic gas scavenging system connection and hose.
Confirm that:
- The scavenging hose is not kinked or crushed.
- The connection is made to the correct port.
- The receiving system is not applying abnormal suction.
- No external hose, adapter, or connector is obstructed.
- The scavenging flow indicator, when equipped, is within its acceptable range.
A significant evacuation-system restriction or excessive suction can disrupt breathing-system pressure and bellows operation.
Expected: Scavenging is connected correctly and does not interfere with ventilation.
If disconnecting the machine from a questionable external scavenging source restores operation during controlled testing, investigate the facility evacuation system before returning the machine to use.
11. Power-Cycle the Machine Safely
After documenting active messages and removing the device from patient use:
- Turn the system off normally.
- Wait for the shutdown process to complete.
- Verify the AC power connection.
- Restart the machine.
- Observe the startup process for errors.
- Repeat the manufacturer-required pre-use checkout.
Do not repeatedly restart a machine that displays a persistent ventilator, control, or hardware fault.
Expected: The system starts without ventilator-related faults and successfully completes checkout.
If normal ventilation returns after restart, perform repeated operational testing to confirm that the problem is not intermittent.
12. Perform the Full System Checkout
Use an approved test lung and perform the complete manufacturer-required checkout.
Verify:
- Leak-test results
- Circuit-pressure generation
- Bellows rise and fall
- Delivered volume or pressure
- Respiratory rate
- Inspiratory and expiratory valve operation
- Alarm operation
- Manual and mechanical ventilation
- Stable operation across appropriate ventilation modes
The Carestation 600 Series user reference documentation identifies the platform as an integrated anesthesia delivery and patient-monitoring system; a successful system checkout is necessary before clinical use.
Expected: The machine completes checkout and provides stable, repeatable ventilation without abnormal alarms.
Do not return the machine to service based only on a single successful breath or brief test.
If the Problem Persists
If the bellows still does not rise or the ventilator does not cycle after gas supplies, settings, breathing-circuit connections, removable components, flow sensors, scavenging, and system checkout have been evaluated, common external causes have been ruled out.
The remaining problem may involve an internal leak, drive-gas fault, ventilator valve, control electronics, internal pneumatic component, or bellows-base assembly.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for qualified repair or bench evaluation
- Tested using approved service procedures before being released
Do not proceed with internal pneumatic or electronic disassembly without appropriate training, authorization, test equipment, and current service documentation.
Knowing when to stop and escalate is proper troubleshooting.
Clinical Use Tip
Never attempt prolonged bellows or ventilator troubleshooting while the machine is connected to an active patient. Establish alternate ventilation first and troubleshoot only when patient care is safely supported.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Anesthesia staff reported that the Carestation 600 Series bellows did not rise and the ventilator would not cycle in mechanical ventilation mode."
Cause
What was observed during troubleshooting.
Example:
"Inspection found the expiratory flow sensor incorrectly seated after breathing-system cleaning, creating a significant system leak."
Resolution
What action was taken.
Example:
"Correctly installed the flow sensor, completed the full system checkout, verified stable bellows movement and ventilation with a test lung, and returned the machine to service."
Helpful Details to Include (If Known)
- Patient removed or alternate ventilation established
- Ventilation mode and selected settings
- Exact alarm or advisory message
- Bellows movement observed
- Manual ventilation test result
- Pipeline and cylinder pressures
- Bag-to-ventilator selector position
- Circuit and test-lung configuration
- Absorber installation checked
- Flow sensors inspected or exchanged
- Scavenging connection tested
- Leak-test and checkout results
- Unusual sounds, heat, odor, or visible damage
- Final device status
Final Thought
Bellows and ventilator problems require immediate attention because they directly affect ventilation. Protect the patient first, verify external gas, circuit, accessory, and assembly conditions logically, and escalate when reliable operation cannot be confirmed. Accurate CCR documentation preserves the failure history and supports safe repair decisions.
That is successful troubleshooting.