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What This Guide Helps With
Troubleshooting oxygen-supply alarms, incorrect oxygen delivery, restricted ambient-air intake, damaged hoses, source-pressure problems, or turbine-related airflow failure.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
Do not troubleshoot a suspected gas-supply failure while the HAMILTON-C6 is actively supporting a patient.
- Notify respiratory therapy and the clinical team immediately.
- Transfer the patient to another verified ventilator or approved ventilation method.
- Provide manual ventilation when clinically required and performed by qualified personnel.
- Confirm adequate ventilation and oxygenation using independent monitoring.
Expected outcome: The patient is safely supported without depending on a ventilator with an uncertain gas supply.
Continue Clinical Engineering troubleshooting only after the affected ventilator has been removed from patient use.
2. Confirm the Exact Alarm or Failure
Record the complete alarm wording and determine whether the reported problem involves:
- Loss of oxygen supply
- Low oxygen-source pressure
- Delivered oxygen concentration differing from the set value
- Inability to achieve the selected FiO₂
- Reduced flow or pressure during ventilation
- Turbine, blower, or technical fault messages
- Failure occurring only at high flow or high oxygen settings
The HAMILTON-C6 uses a turbine to draw ambient air and uses an external high-pressure oxygen source. Therefore, a reported “air supply failure” may involve the ambient-air inlet or turbine rather than a disconnected wall-air hose.
Expected outcome: The failure is identified as an oxygen-source issue, ambient-air restriction, setup problem, or possible internal airflow failure.
3. Inspect the Ventilator Externally
Check the ventilator for:
- Physical or liquid damage
- Blocked ventilation openings
- Dust, linens, plastic coverings, or equipment obstructing the air inlet
- Unusual heat, odor, vibration, or turbine noise
- Damaged oxygen fittings or connectors
- Evidence that the ventilator was dropped or struck
Move the ventilator to a clean, open test location with adequate clearance around its air openings.
Expected outcome: The ventilator has unobstructed airflow and no obvious physical damage.
If clearing an external obstruction resolves the issue and the ventilator passes all required testing, stop troubleshooting.
4. Verify the Oxygen Source
Confirm that the oxygen source is available and appropriate:
- Test the wall oxygen outlet with an approved gas-pressure analyzer or verified test device.
- When using a cylinder, verify that it contains sufficient oxygen and that the valve is fully open.
- Confirm that the regulator is compatible, functional, and providing stable pressure.
- Check whether other equipment connected to the same outlet is experiencing oxygen-supply problems.
- Try a known-good oxygen outlet or cylinder when available.
Do not use an unverified source merely because gas can be heard flowing.
Expected outcome: A stable, verified high-pressure oxygen source is available to the ventilator.
If the source is defective, remove that outlet, regulator, or cylinder from use and notify the appropriate department.
5. Inspect the Oxygen Hose and Fittings
Disconnect the oxygen hose from service pressure before inspecting it.
Check for:
- Kinks, crushing, or tight bends
- Cuts, cracking, blistering, or contamination
- Loose or damaged fittings
- Missing or damaged connector seals
- Incorrect gas-specific fittings
- A hose that is not fully seated at the wall outlet or ventilator
- Evidence that the hose has been stretched or rolled over
Reconnect both ends securely. Substitute a known-good, compatible oxygen hose when possible.
Expected outcome: Oxygen reaches the ventilator through a correctly connected, undamaged hose.
If replacing the hose resolves the alarm, complete operational testing and stop troubleshooting.
6. Confirm the Correct Gas Connection
Verify that the hose is connected to the ventilator’s oxygen inlet and to a verified oxygen source.
Check that:
- The connector matches the facility’s oxygen standard.
- No adapters are loose, damaged, or incorrectly installed.
- The oxygen hose has not been mistakenly connected to another medical-gas service.
- The fitting locks completely into place.
The manufacturer identifies high-pressure oxygen from a central supply or cylinder as the C6 oxygen source.
Expected outcome: The correct gas is connected to the correct inlet with secure, gas-specific fittings.
7. Check the Ambient-Air Intake Area
Because the C6 uses an internal turbine for airflow, inspect the accessible ambient-air intake and external filter area without opening the ventilator.
Check for:
- Dust accumulation
- A wet or visibly contaminated filter
- Packaging, linens, or equipment blocking the intake
- Incorrectly installed external filter components
- Restriction caused by positioning the ventilator against a wall or cabinet
Replace only user-accessible filter components when permitted by facility procedure and manufacturer instructions.
Expected outcome: Ambient air can enter the ventilator without external restriction.
Do not open the ventilator or attempt turbine disassembly during initial troubleshooting.
8. Restart the Ventilator Off the Patient
With the ventilator connected to verified AC power and a verified oxygen source:
- Power the ventilator off.
- Allow it to shut down completely.
- Confirm all hoses and test accessories are properly connected.
- Restart the ventilator.
- Observe the startup sequence for gas-supply or technical alarms.
Record any displayed alarm number, technical code, or message exactly as shown.
Expected outcome: The ventilator completes startup without a gas-supply or turbine-related fault.
If the alarm returns, continue troubleshooting.
9. Review Oxygen and Ventilation Settings
Using a test lung, review:
- Set oxygen concentration
- Ventilation mode
- Flow demand
- Pressure and volume settings
- Patient category
- Any recent configuration changes
Determine whether the failure occurs:
- At all oxygen settings
- Only when FiO₂ is increased
- Only at high minute-volume demand
- Immediately after startup
- Intermittently during operation
Do not change clinical settings merely to suppress an alarm. Use controlled test settings appropriate for bench evaluation.
Expected outcome: The issue is reproduced under controlled conditions and is not caused by an unrealistic or unintended setup.
10. Perform the Required Preoperational Check
Connect the ventilator to a manufacturer-compatible test circuit and test lung. Run the applicable preoperational checks according to the facility’s approved procedure.
Verify:
- The test completes without oxygen-supply errors.
- The ventilator builds and maintains pressure.
- Delivered flow appears stable.
- Audible and visual alarms function.
- The device recognizes the oxygen source.
- No turbine or technical fault is displayed.
Hamilton provides C6-specific preoperational-check resources as part of its official training materials.
Expected outcome: The ventilator passes its preoperational checks without gas-supply or airflow faults.
Do not return the device to service if any required test fails.
11. Verify Delivered Oxygen and Ventilator Performance
Using calibrated test equipment, compare the set oxygen concentration with the measured delivered concentration at several representative settings.
Also verify:
- Delivered tidal volume or flow
- Airway pressure
- Stability during increased flow demand
- Alarm activation when the oxygen source is intentionally removed during controlled testing
- Recovery after the verified oxygen source is restored
Follow the facility’s performance limits and current manufacturer service documentation.
Expected outcome: Delivered oxygen and ventilation performance remain within approved limits.
If oxygen concentration is inaccurate despite a verified source, hose, fittings, and setup, stop troubleshooting and escalate the device.
12. Compare with Known-Good External Components
When available, repeat testing using:
- A known-good oxygen outlet
- A known-good oxygen hose
- A verified cylinder and regulator
- A known-good patient circuit
- A verified test lung
Change one component at a time so the cause can be identified.
Expected outcome: The failure either follows an external component or remains with the ventilator.
If the fault remains with the ventilator after all external components are verified, internal evaluation is required.
If the Problem Persists
If the HAMILTON-C6 continues to display an oxygen-supply, turbine, airflow, or delivered-FiO₂ fault after the source, hose, fittings, ambient-air intake, settings, circuit, and test equipment have been verified, common external causes have been ruled out.
The issue may involve an internal oxygen-control component, pressure sensor, turbine assembly, internal pneumatic pathway, control electronics, or calibration fault.
The ventilator should be:
- Removed from service
- Labeled Out of Service
- Sent for qualified repair or bench evaluation
- Evaluated using current Hamilton service documentation and approved test equipment
Do not open the pneumatic system or replace internal components unless trained, authorized, and equipped to complete the required calibration and performance verification.
Knowing when to stop is proper troubleshooting.
Clinical Use Tip
Never troubleshoot uncertain gas delivery on an active patient. Transfer the patient first, maintain independent oxygenation and ventilation monitoring, and test the ventilator only with a test lung in a controlled environment.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory therapy reported that the HAMILTON-C6 displayed an oxygen-supply alarm and could not maintain the selected FiO₂."
Cause
What was observed during troubleshooting.
Example:
"Testing found a damaged oxygen hose fitting that caused an unstable high-pressure oxygen connection."
Resolution
What action was taken.
Example:
"Replaced the oxygen hose, connected the ventilator to a verified oxygen source, completed preoperational and performance testing, and returned the unit to service."
Helpful Details to Include (If Known)
- Exact alarm wording or technical code
- Oxygen source and measured source pressure
- Wall outlet or cylinder tested
- Oxygen hose inspected or substituted
- Condition of gas fittings and seals
- Ambient-air inlet checked for obstruction
- External filter condition
- Whether the fault occurred at all FiO₂ settings
- Delivered oxygen analyzer readings
- Turbine sound or unusual vibration
- Unusual heat, odor, or physical damage
- Preoperational-check results
- Test-lung performance
- Final device status
Final Thought
Gas-supply troubleshooting must begin with patient safety and verification of the external oxygen source, hose, fittings, ambient-air intake, and setup. When the fault remains after controlled testing, remove the ventilator from service and escalate it rather than assuming it is safe to use. Clear CCR documentation preserves the reasoning, findings, and final equipment status.
That is successful troubleshooting.