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What This Guide Helps With
Troubleshooting missing CO2 detection or capnograms caused by module connections, sampling accessories, blockages, contamination, configuration, or communication failure.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
Do not perform extended troubleshooting while the CARESCAPE Canvas is the only device monitoring ventilation on an active patient.
If continuous capnography is clinically required:
- Assess the patient and airway immediately.
- Verify ventilation using another approved clinical method.
- Transfer CO2 monitoring to another verified monitor or capnography device.
- Do not assume a missing capnogram is only an equipment problem.
Expected outcome: Patient ventilation continues to be assessed without relying on the unavailable CO2 parameter.
Continue Clinical Engineering troubleshooting only after the device can be safely removed from active patient use.
2. Confirm the Exact Failure
Observe the CO2 parameter area and record whether the monitor shows:
- CO2 module not detected
- Module disconnected
- Sampling line blocked
- Water trap full or missing
- No breath detected
- Dashed CO2 values
- Numeric values without a waveform
- An intermittent or distorted capnogram
- No CO2 parameter window
Expected outcome: The failure is clearly identified as module recognition, sampling, waveform, or configuration related.
3. Identify the Installed CO2 Configuration
Determine whether CO2 is being provided through:
- A CARESCAPE ONE with compatible Microstream CO2 capability
- A CARESCAPE respiratory gas module
- Another approved CARESCAPE micro-module or parameter interface
CARESCAPE Canvas supports modular parameter acquisition, but available CO2 options depend on installed hardware, software, licensing, and system configuration.
Expected outcome: The correct module, accessories, and communication path are identified before components are exchanged.
4. Inspect the Module and Host Connection
Remove the device from patient use and inspect:
- The CO2 module or CARESCAPE ONE seating
- Module bay or interface connections
- Connector pins and contact surfaces
- Retaining mechanisms
- Communication or interface cables
- Signs of liquid intrusion, contamination, cracks, or physical damage
Reseat the module firmly using normal installation methods. Do not force the module into the interface.
Expected outcome: The module is fully seated, mechanically secure, and recognized by the monitor.
If recognition returns and remains stable, complete functional verification and stop troubleshooting.
5. Restart the CO2 Measurement
Using the normal clinical interface:
- Verify the CO2 measurement is enabled.
- Confirm the CO2 parameter is assigned to the active screen or profile.
- Exit standby or measurement-off modes.
- Allow the module to complete its startup and initialization period.
Do not enter protected service menus or alter institutional defaults unless authorized.
Expected outcome: The CO2 parameter window appears and the module begins its normal initialization sequence.
6. Inspect the Sampling Line
For sidestream CO2 configurations, inspect the complete sampling path for:
- Loose connections
- Kinks or compression
- Cracks or punctures
- Moisture
- Secretions
- Occlusion
- Incorrect assembly
- Expired or incompatible accessories
Disconnect and reconnect the sampling line at both the patient-end accessory and module inlet.
Expected outcome: The sampling line is secure, open, dry, and compatible with the installed CO2 system.
If the capnogram returns, replace any questionable disposable accessory and stop troubleshooting.
7. Inspect the Water Trap or Sampling Receptacle
When the installed respiratory module uses a water trap:
- Verify the correct trap is installed.
- Confirm it is completely seated.
- Check for fluid, discoloration, contamination, cracks, or a blocked membrane.
- Replace a full, damaged, contaminated, or questionable trap with an approved replacement.
GE respiratory modules use sidestream sampling, and water-trap condition can directly affect gas sampling.
Expected outcome: The module begins sampling without blockage or water-trap alarms.
8. Test With Known-Good Accessories
Replace the installed components one at a time with compatible known-good items:
- Sampling line
- Airway adapter or nasal cannula
- Water trap, when applicable
- Module interface cable, when applicable
Change only one item at a time so the failed component can be identified.
Expected outcome: A capnogram and respiratory rate appear when the defective accessory is removed.
If the issue is corrected, discard or quarantine the failed accessory according to facility policy and stop troubleshooting.
9. Check for Sampling Pump Operation
Listen for normal sampling-pump operation and observe the monitor for continuing blockage or flow-related messages.
Do not insert tools, compressed air, cleaning solution, or probes into the sampling inlet.
Expected outcome: The module draws a sample without unusual noise, repeated blockage alarms, or loss of flow.
No pump sound, abnormal noise, or persistent blockage with known-good accessories suggests an internal module problem.
10. Test the Module on Another Compatible System
When available and permitted:
- Install the suspect CO2 module or CARESCAPE ONE on another compatible, verified CARESCAPE system.
- Install a known-good compatible module on the affected CARESCAPE Canvas.
- Confirm software and configuration compatibility before swapping equipment.
Expected outcome:
- If the suspect module fails on both systems, the module is likely defective.
- If a known-good module also fails on the affected Canvas, investigate the Canvas interface, configuration, or software.
- If both components work after reseating, suspect an intermittent connection.
11. Perform a Controlled Functional Test
Connect the device to an approved patient simulator, capnography test source, or manufacturer-approved gas-analysis test setup.
Verify:
- Module recognition
- Stable CO2 numeric display
- Visible capnogram
- Respiratory rate calculation
- Appropriate alarm response
- No blockage, water-trap, or module communication messages
Do not use exhaled breath as the only return-to-service verification.
Expected outcome: The CARESCAPE Canvas consistently displays and alarms on a controlled CO2 input.
If the system passes, return it to service only after completing required inspection and documentation.
12. Check for Software or Configuration Symptoms
If hardware and accessories test normally, document whether:
- The CO2 parameter disappears after startup.
- The module is recognized intermittently.
- The issue follows a specific clinical profile.
- A recent software update or configuration change occurred.
- Other modules also disconnect or disappear.
- The monitor displays communication or configuration errors.
Do not reinstall software, modify licenses, or perform protected configuration changes without authorization and approved GE service documentation.
Expected outcome: A software, licensing, profile, or host communication issue is distinguished from a failed CO2 module.
If the Problem Persists
If the module remains unrecognized or no capnogram is produced after checking connections, accessories, sampling components, settings, and known-good substitutions, the common external causes have been ruled out.
The issue may involve:
- Failed sampling pump
- Internal module contamination or occlusion
- Module electronics failure
- Damaged module interface
- Host communication failure
- Software or licensing problem
- Internal CARESCAPE ONE or Canvas hardware failure
The device or affected module should be:
- Removed from service
- Labeled Out of Service
- Sent for authorized repair or bench evaluation
- Escalated to GE HealthCare support when required
Do not open the gas module, bypass alarms, or attempt internal pneumatic or board-level repairs without proper authorization, training, and service documentation.
Knowing when to stop and escalate is proper troubleshooting.
Clinical Use Tip
Never troubleshoot a missing capnogram while an active patient depends on that channel for ventilation monitoring. Transfer monitoring first and verify ventilation independently.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the CARESCAPE Canvas did not recognize the CO2 module and displayed no capnogram."
Cause
What was observed during troubleshooting.
Example:
"Testing found a fluid-contaminated water trap restricting sidestream gas flow and preventing a stable CO2 waveform."
Resolution
What action was taken.
Example:
"Replaced the water trap and sampling line, verified module recognition, stable capnogram, respiratory rate, and CO2 alarms using an approved test setup, and returned the monitor to service."
Helpful Details to Include (If Known)
- Exact CO2 message displayed
- CO2 configuration or module type
- CARESCAPE ONE software version, if applicable
- Module recognition status
- Sampling line inspected or replaced
- Water trap condition
- Known-good module or accessory tested
- Sampling-pump sound or behavior
- Recent software or configuration changes
- Alarm behavior verified
- Signs of liquid contamination
- Final device and module status
Final Thought
Safe CO2 troubleshooting begins by protecting the patient, then separating module-recognition problems from sampling-path failures. Logical accessory checks and controlled substitution prevent unnecessary repairs, while complete CCR documentation supports future service decisions.
That is successful troubleshooting.