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What This Guide Helps With
This guide addresses situations where a Servo-i ventilator displays flow sensor errors, tidal volume inconsistencies, or measurement discrepancies. It focuses on external and easily verifiable causes first—such as tubing, sensors, humidifiers, and patient circuit setup—before assuming internal sensor or board failure. The goal is to restore accurate ventilator measurements safely.
Step-by-Step Troubleshooting
Verify Power and Startup Sequence
- Confirm the ventilator is properly powered and the battery is charged.
- Check that the ventilator completes its self-test without unexpected alarms.
- Why: Incomplete self-tests or unstable power can trigger false flow errors.
Inspect Patient Circuit Connections
- Ensure inspiratory and expiratory limbs are correctly connected.
- Confirm that filters, humidifiers, and heat moisture exchangers (HMEs) are properly seated.
- Why: Leaks or misaligned tubing can cause erroneous volume readings.
Check Flow Sensor (Pneumotach) and Adapter
- Remove and visually inspect the flow sensor for condensation, debris, or damage.
- Ensure the sensor is installed in the correct orientation according to the device labeling.
- Why: Obstructions, moisture, or incorrect installation can trigger measurement errors.
Inspect Circuit for Leaks
- Perform a leak test if the ventilator supports it.
- Check all connections, including endotracheal tube cuff seal, Y-piece, and filters.
- Why: Leaks affect tidal volume delivery and flow measurement accuracy.
Check Humidification and Condensation
- Drain excess water from heated circuits or HMEs.
- Confirm that the flow sensor is dry.
- Why: Condensation in the sensor or tubing alters flow and volume readings.
Swap with Known Good Consumables
- Replace the flow sensor or adapter with a verified functioning unit.
- Replace disposable patient circuit if necessary.
- Why: Confirms whether the error is due to consumable components rather than the ventilator hardware.
Verify Settings and Calibration
- Confirm ventilator mode, tidal volume, and circuit type are correctly configured.
- Re-run calibration or zeroing procedures as per normal operating procedure.
- Why: Incorrect configuration can cause alarms for “flow error” or “volume discrepancy.”
If the Problem Persists
External causes have been ruled out.
- The ventilator should be removed from service.
- Labeled Out of Service.
- Sent for internal service or bench evaluation by Getinge service personnel.
Note: Clinical Engineering should not attempt internal sensor replacement beyond approved procedures.
Clinical Use Tip
Do not troubleshoot on an active patient. Move the patient to another ventilator if flow errors are detected.
Ensure accurate tidal volumes and patient safety before reconnecting the patient.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Ventilator displays “flow sensor error” and delivered tidal volume inconsistent.”
Cause
What was observed during troubleshooting.
Example:
“External inspection revealed condensation in flow sensor and minor leak at Y-piece connection.”
Resolution
What action was taken.
Example:
“Drained condensation, secured connections, replaced disposable sensor and patient circuit, recalibrated ventilator. Verified proper tidal volume delivery.”
Helpful Details to Include
- Outlet tested and verified
- Power stability checked
- Circuit orientation confirmed
- Condensation present or absent
- Sensor replacement history
- Post-troubleshooting tidal volume verification
Final Thought
Proper troubleshooting prioritizes patient safety, confirms external causes first, and avoids unnecessary internal repair attempts. Accurate documentation ensures compliance and supports cost-effective service decisions.
That is successful troubleshooting.