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What This Guide Helps With
Troubleshoots abnormal turbine noise or weak gas delivery caused by airflow obstruction, circuit problems, environment, power, accessories, or internal turbine-system faults.
Step-by-Step Troubleshooting
1. Protect the Patient From Unreliable Gas Delivery
If ventilation is weak, unstable, unusually noisy, or associated with a suspected turbine problem, move the patient to another verified ventilator immediately.
Do not continue troubleshooting while the patient depends on uncertain gas delivery.
Expected outcome: Patient ventilation is maintained with reliable alternate equipment and the Savina 300 is available for off-patient evaluation.
2. Confirm the Complaint
Determine whether the reported problem is:
- New or unusually loud turbine noise
- Grinding, rattling, or changing mechanical sound
- Weak inspiratory flow
- Inability to reach expected pressure or volume
- Intermittent gas delivery
- Complete failure to ventilate
Note whether the problem begins at startup or only under greater test-lung demand.
Expected outcome: The turbine or gas-delivery complaint is clearly characterized and reproducible.
3. Inspect for Immediate Safety Concerns
Check for:
- Burning odor
- Excessive heat
- Smoke
- Visible damage
- Severe mechanical noise
- Evidence of fluid intrusion
If any are present, disconnect the unit from clinical use and discontinue testing.
Expected outcome: The ventilator has no immediate signs requiring termination of troubleshooting. Severe abnormal conditions require immediate removal from service.
4. Verify AC Power
Confirm stable AC input and inspect the power cord and external power connection.
A power problem can cause abnormal blower or turbine performance and should be excluded before assuming a mechanical failure.
Expected outcome: Reliable AC power is confirmed. If restoring stable input resolves operation, continue through functional testing.
5. Inspect Ventilation Openings and Environment
Inspect accessible air-inlet and ventilation openings for obstruction from dust, linens, packaging, or positioning against a wall or other equipment.
Ensure the ventilator is being operated in an appropriate environment with adequate airflow.
Expected outcome: External airflow paths are unobstructed. If removing an obstruction restores normal operation and noise, proceed to verification.
6. Inspect the Patient Circuit
Check the breathing circuit, filters, humidification components, valves, and adapters for restriction or blockage that could make the turbine operate abnormally or appear weak.
Expected outcome: The external circuit is unrestricted and correctly assembled.
7. Check for Significant Leakage
Inspect the circuit for large leaks that could cause the turbine to work continuously at elevated output or prevent pressure and volume targets from being achieved.
Expected outcome: The circuit is leak-free. If correcting an external leak restores normal turbine sound and delivery, complete final verification.
8. Compare With a Known-Good Circuit and Test Lung
Simplify the setup using known-good compatible breathing-circuit components and a known-good test lung.
Observe turbine sound and compare delivered flow, pressure, and volume with approved test equipment.
Expected outcome: Gas delivery is stable and the turbine produces only normal operating sound. If so, the problem was external and troubleshooting can stop after verification.
9. Evaluate Gas-Delivery Performance
Using an approved ventilator analyzer, verify applicable flow, pressure, and volume performance under controlled conditions.
Do not attempt turbine disassembly, bearing repair, or internal adjustment.
Expected outcome: The ventilator meets applicable performance criteria without abnormal noise or instability.
10. Escalate Suspected Turbine Failure
Persistent mechanical noise, weak output, inability to achieve test conditions, or turbine-related malfunction after external causes are excluded requires service-level evaluation.
Expected outcome: The ventilator is removed from service rather than returned with an unresolved gas-delivery problem.
If the Problem Persists
Power, environment, breathing circuit, leakage, accessories, and test setup have been ruled out. Remaining causes may involve the turbine assembly, turbine drive electronics, internal airflow path, pressure or flow control, power electronics, or another service-level fault.
The ventilator should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate Drager documentation and approved ventilator test equipment
- Repaired only by qualified personnel
Do not disassemble or repair the turbine at board or component level without approved service procedures. Following repair, verify complete gas delivery, pressure, flow, volume, alarms, and electrical safety before return to service.
Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
A new mechanical sound from a ventilator should be treated seriously when it occurs with any change in pressure, flow, or volume delivery.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported unusually loud turbine operation and reduced gas delivery from the Savina 300 during a pre-use test."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found an external intake area obstructed by material positioned against the ventilator."
Resolution
What action was taken.
Example:
"The obstruction was removed, airflow clearance was restored, and the ventilator passed pressure, flow, volume, alarm, and test-lung functional verification."
Helpful Details to Include (If Known)
- Description of abnormal sound
- When the sound occurred
- AC power condition
- Air-inlet obstruction
- Circuit and filter condition
- Leak-test result
- Pressure, flow, and volume measurements
- Heat or odor observed
- Results before and after correction
- Final device status
Final Thought
Abnormal turbine behavior can directly affect ventilation. Verify power, airflow, circuit condition, and objective gas-delivery performance before assuming internal failure, and remove the ventilator from service when mechanical or delivery problems remain unexplained.
That is successful troubleshooting.