GE Healthcare Avance

Asset Type

Anesthesia Machine

Manufacturer

GE Healthcare

Model

Avance

What This Guide Helps With

Troubleshooting unavailable respiratory-gas measurements caused by module seating, sampling components, moisture, blockage, configuration, power, or communication problems.

Step-by-Step Troubleshooting

1. Ensure Patient Safety First

Do not remove, exchange, or troubleshoot the gas module while the Avance is actively supporting a patient unless directed by the anesthesia provider under an approved backup-monitoring plan.

If inspired or expired O2, CO2, N2O, or anesthetic-agent measurements are unavailable during a procedure:

• Notify the anesthesia provider immediately.
• Establish approved independent gas and patient monitoring.
• Move the patient to another verified anesthesia machine when clinically appropriate.
• Do not rely on estimated gas concentrations.

Expected: Patient care continues with verified ventilation and respiratory-gas monitoring.

The Avance airway module measures gases delivered to and exhaled by the patient, making loss of these measurements clinically significant.

If patient safety and alternate monitoring are established, continue troubleshooting off patient.

2. Confirm the Exact Failure Condition

Record the complete displayed message and determine what information is unavailable:

• Entire gas module not recognized
• No CO2 waveform or value
• Inspired or expired O2 unavailable
• Anesthetic-agent identification unavailable
• N2O measurement unavailable
• Sampling or water-trap alarm
• Values appear briefly and then disappear

Check whether ventilation pressure, flow, and volume measurements remain available.

Expected: The failure is narrowed to module recognition, a specific gas measurement, or the sampling pathway.

3. Inspect the Gas Module Installation

Verify that the compact airway or respiratory gas module is:

• Installed in the correct module slot
• Fully inserted
• Straight and securely seated
• Free from visible damage
• Not partially released from the module rack

Remove and reseat the module only when the machine is not being used on a patient and according to facility procedures.

Expected: The module seats completely and is detected by the Avance.

If recognition returns and gas measurements stabilize, complete an operational verification and stop.

4. Inspect the Module and Slot Contacts

Remove the module and inspect the exterior connector area and module slot for:

• Moisture
• Dust or residue
• Bent or damaged contacts
• Cracked housing
• Foreign material
• Signs of liquid intrusion

Do not insert tools, sprays, or cleaning fluids into the module slot. Clean only accessible external surfaces using approved methods.

Expected: The module and slot are dry, clean, and visibly undamaged.

If contamination, liquid intrusion, or damaged contacts are present, remove the device or module from service and escalate for repair.

5. Check the Water Trap

Inspect the gas-module water trap for:

• Full or excessive collected fluid
• Cracks
• Loose installation
• Incorrect water-trap type
• Contaminated filter membrane
• Damaged seals
• Evidence of fluid passing beyond the trap

Empty or replace the water trap according to facility policy and the applicable manufacturer instructions.

Expected: A compatible, dry water trap is securely installed and the sampling pathway is protected from moisture.

If measurements return after correcting the water trap, allow readings to stabilize and stop.

6. Inspect the Sampling Line

Trace the complete sample line from the patient circuit to the gas module.

Check for:

• Disconnection
• Loose fittings
• Kinks
• Compression beneath equipment
• Condensation
• Internal blockage
• Cracks or leaks
• Incorrect tubing
• Contaminated patient-end connector

Replace the sample line with a known-good compatible line when damage or restriction is suspected.

Expected: The sample line is open, dry, correctly connected, and leak-free.

If the gas waveform and measurements return, verify stable operation and stop.

7. Check the Patient Sampling Connection

Verify that the sample line is connected to the correct sampling port near the patient airway.

Inspect the airway adapter or circuit sampling connector for:

• Secretions
• Condensation
• Occlusion
• Incorrect orientation
• Loose connection
• Damage

Do not test using a contaminated clinical circuit.

Expected: Gas can move freely from the breathing circuit through the sampling line to the module.

8. Allow the Module to Complete Startup

After reseating or replacing the module, allow sufficient time for:

• Module recognition
• Internal initialization
• Sensor warm-up
• Automatic zeroing
• Agent identification

Observe for messages indicating warming, zeroing, calibration, or temporary measurement unavailability.

Expected: Temporary startup messages clear and gas values become available.

Do not condemn the module before its normal initialization period has completed.

9. Review Gas-Monitoring Settings

Confirm that the Avance is configured to display and use the installed gas module.

Check relevant settings for:

• Gas monitoring enabled
• Correct module source
• CO2 waveform selected
• Gas numerics assigned to the screen
• Appropriate agent monitoring configuration
• Automatic or manual agent identification selection
• Alarm limits enabled as required

Expected: Installed module measurements are selected and visible on the configured display pages.

If values were present but hidden by the screen configuration, restore the correct display setup and stop.

10. Perform a Controlled Power Restart

When the machine is off patient and alternate equipment is available:

• Turn the Avance off using the normal shutdown process.
• Remove and inspect the gas module.
• Reinstall the module securely.
• Restart the system.
• Observe whether the module is recognized during startup.

Do not interrupt power while the machine is supporting a patient.

Expected: The Avance completes startup and recognizes the gas module without recurring communication alarms.

11. Test With a Known-Good Gas Module

When available, install a compatible, verified gas module of the correct type.

GE respiratory-module measurement options vary, and not every module option is supported by every host device. Confirm compatibility before substitution.

Interpret the result:

• Known-good module works: The original module, water trap, or module-specific sampling system is suspect.
• Known-good module is also not recognized: The Avance module slot, power supply, communication path, or system configuration may be faulty.
• Module is recognized but measurements remain unavailable: Continue evaluating the water trap, sampling line, patient connection, settings, and test-gas source.

Expected: Substitution isolates the problem to the removable module or the anesthesia-machine host.

12. Verify Measurements With an Approved Test Source

Using an approved gas-simulation or verification method:

• Confirm CO2 detection and waveform response.
• Confirm O2 measurement response when applicable.
• Confirm agent identification only with an approved test source and facility procedure.
• Verify that displayed values stabilize and alarms operate appropriately.

Do not expose personnel to anesthetic vapor or improvise agent-testing methods.

Expected: The module produces stable, plausible measurements and appropriate waveforms.

If the module passes verification, return the machine to service only after completing the required operational checkout.

If the Problem Persists

If the gas module remains unrecognized, repeatedly disconnects, fails verification, or produces unavailable or unreliable measurements after external checks, the likely causes include:

• Failed gas module
• Damaged module connector
• Module-slot power failure
• Internal communication fault
• Internal sampling-pump failure
• Sensor or optical-bench failure
• Internal contamination or liquid damage
• Software or configuration fault

The device should be:

• Removed from service
• Labeled Out of Service
• Sent for repair or bench evaluation
• Evaluated using approved GE service documentation and test equipment

Do not open the gas module or continue internal disassembly without appropriate authorization, training, and service procedures.

Knowing when external causes have been ruled out and escalation is required is proper troubleshooting.

Clinical Use Tip

Do not troubleshoot absent respiratory-gas measurements on an active patient without an approved backup monitor. Restore reliable gas monitoring before continued clinical use.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Anesthesia staff reported that the GE Healthcare Avance displayed gas measurement unavailable and did not show CO2 or anesthetic-agent values."

Cause

What was observed during troubleshooting.

Example:
"The gas-module water trap was saturated and the sample line contained condensation, preventing adequate sample flow."

Resolution

What action was taken.

Example:
"Replaced the water trap and sample line, reseated the gas module, verified stable CO2 and gas measurements, and completed the operational checkout successfully."

Helpful Details to Include (If Known)

• Exact displayed alarm or message
• Gas module model and serial number
• Module recognition status
• Water-trap condition
• Sampling line inspected or replaced
• Presence of moisture or contamination
• CO2 waveform behavior
• O2 and agent values available or unavailable
• Known-good module substitution result
• Module slot tested
• Power restart performed
• Unusual heat, odor, or sounds
• Operational checkout result
• Final device status

Final Thought

Loss of gas monitoring requires immediate attention because treatment should not continue without dependable respiratory-gas information. External sampling components, module seating, compatibility, and settings should be ruled out logically before internal failure is suspected. Clear CCR documentation supports safe escalation and prevents repeat troubleshooting.

That is successful troubleshooting.