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What This Guide Helps With
Troubleshooting air-supply alarms, compressor failure, reduced gas pressure, disconnected hoses, closed outlets, restricted fittings, or unavailable wall-gas sources.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
Do not troubleshoot a gas-source or compressor failure while the Puritan Bennett 980 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 directed by qualified staff.
- Confirm effective ventilation and alarm operation on the replacement equipment.
Expected outcome: The patient is safely supported without relying on a ventilator with an unreliable gas source.
Continue Clinical Engineering troubleshooting only after the affected PB980 has been removed from patient use. The PB980 is intended for neonatal, pediatric, and adult critical-care ventilation and should be operated by trained healthcare professionals.
2. Confirm the Exact Failure
Review the active alarm, alarm history, and reported behavior. Determine whether the issue involves:
- Complete loss of medical air
- Intermittent or low air-supply pressure
- Internal or external compressor failure
- Failure limited to one wall outlet
- Failure after the ventilator was moved
- Abnormal compressor noise, vibration, heat, or odor
- Inability to complete startup or the short self-test
Record the exact alarm wording and any diagnostic code before cycling power.
Expected outcome: The failure is clearly identified as an air-source, compressor, connection, or ventilator-related problem.
3. Verify the Facility Gas Source
Confirm that the medical-air wall outlet or approved external gas source is available.
- Check whether nearby equipment connected to the same outlet or zone also reports low air pressure.
- Ask Facilities or respiratory therapy whether there is a known medical-gas interruption.
- Verify that zone valves have not been closed for maintenance or an emergency.
- Do not use oxygen as a substitute for medical air unless the ventilator configuration and clinical procedure specifically permit it.
Expected outcome: A functioning facility medical-air source is confirmed.
If the wall source is unavailable, relocate the ventilator to a verified outlet or address the facility gas issue. Stop if normal operation is restored.
4. Inspect the Air-Supply Hose
Inspect the entire medical-air hose from the wall outlet or compressor to the ventilator.
Check for:
- A hose that is disconnected or not fully seated
- Kinks, crushing, or sharp bends
- Cuts, cracks, bulges, or worn fittings
- Contamination inside either connector
- Incorrect gas-specific fittings
- Loose adapters or quick-connect fittings
- Excessive tension caused by equipment placement
Reconnect each fitting securely without forcing incompatible connectors.
Expected outcome: The hose is correctly connected, unrestricted, undamaged, and appropriate for medical air.
If correcting the hose connection clears the alarm and the ventilator passes testing, stop.
5. Test the Wall Outlet and Hose Independently
Use an approved medical-gas pressure tester or another facility-approved method to verify the wall outlet.
When permitted:
- Test the suspect hose on a known-good air outlet.
- Test the ventilator with a known-good compatible air hose.
- Compare results using one change at a time.
Do not vent medical gas unnecessarily or use unapproved gauges and adapters.
Expected outcome: The fault is isolated to the wall outlet, gas hose, or ventilator.
Replace a defective hose or refer an outlet problem to Facilities. Stop if the PB980 operates normally afterward.
6. Check the Ventilator Air-Inlet Connection
Inspect the PB980 air-inlet fitting externally.
Look for:
- A fitting that is loose or visibly damaged
- Debris or contamination
- A damaged sealing surface
- An adapter preventing complete engagement
- Evidence that the unit was struck or pulled while connected
- Gas leakage that can be heard or felt at the connection
Do not insert tools into the inlet or attempt internal fitting repair during floor troubleshooting.
Expected outcome: The external air-inlet connection is clean, secure, and free of visible damage or leakage.
7. Evaluate the Compressor Configuration
Determine whether the PB980 is expected to use:
- Facility-provided compressed medical air
- An approved external compressor
- An installed compressor configuration
Confirm that the compressor is connected, powered, and configured according to the facility’s approved setup.
For an external compressor, check:
- AC power and power-cord connection
- Power switch and status indicators
- Air hose connection
- Intake obstruction
- Accessible filters or moisture traps
- Overtemperature or fault indicators
- Unusual noise, vibration, heat, or smell
Do not remove compressor covers or bypass protective devices.
Expected outcome: The compressor powers on, produces stable air pressure, and shows no external fault condition.
8. Confirm Adequate AC Power for the Compressor
If a compressor is used, connect it directly to a verified hospital-grade receptacle.
- Avoid unapproved extension cords or overloaded power strips.
- Confirm the receptacle provides stable power.
- Inspect the compressor power cord and plug for damage.
- Reset only user-accessible circuit protection when allowed by facility policy.
- Do not repeatedly reset a breaker that trips again.
Expected outcome: The compressor receives stable AC power and remains operating.
A repeated trip, burning smell, excessive heat, or immediate shutdown requires removal from service.
9. Check Accessible Intake and Cooling Areas
Inspect externally accessible compressor and ventilator air intakes.
- Remove obvious external lint or obstruction.
- Confirm cooling vents are not blocked by linens, walls, equipment, or packaging.
- Verify that approved external filters are correctly installed and not visibly saturated or collapsed.
- Do not operate the compressor without required filters.
- Do not open the ventilator or compressor housing.
Expected outcome: Air intake and cooling paths are externally clear.
If clearing an obstruction restores stable compressor operation, continue with functional testing before returning the system to use.
10. Restart the System Off-Patient
After confirming the external gas source, hoses, fittings, and compressor condition:
- Power the ventilator down using the normal shutdown procedure.
- Allow the shutdown sequence to complete.
- Restore the verified air source.
- Power the compressor first when applicable.
- Power on the PB980.
- Observe startup messages and alarm behavior.
Do not repeatedly restart a ventilator that continues to report a gas-delivery failure.
Expected outcome: The PB980 completes startup without recurring air-supply or compressor alarms.
11. Run the Required Pre-Use Test
Connect an approved test circuit and test lung. Complete the manufacturer-required startup or short self-test according to facility procedure and the current operator’s manual.
Confirm:
- The test completes successfully.
- Air-supply alarms do not recur.
- Delivered pressure and volume are stable.
- Gas-source indicators remain normal.
- No abnormal compressor sound, heat, or vibration develops.
- Alarm functions remain available.
The manufacturer identifies the operator’s manual as the primary operating and troubleshooting reference for the PB980.
Expected outcome: The ventilator passes the required pre-use testing with a verified gas source.
If the ventilator passes after replacing a hose or correcting the external source, document the repair and return it according to facility policy.
12. Compare With a Known-Good Gas Source
When the failure remains unclear, connect the PB980 to a known-good compatible air source using a known-good hose.
- Keep all other setup conditions unchanged.
- Observe the air-supply status during startup and test-lung operation.
- Do not connect the ventilator to an unregulated or nonmedical compressed-air source.
Expected outcome: The comparison confirms whether the failure follows the source equipment or remains with the PB980.
If the alarm remains with verified gas pressure and a known-good hose, suspect an internal pressure-regulation, gas-mixing, sensor, inlet, or compressor-system problem.
13. Review Logs and Diagnostic Information
Record available information before removing the unit from service:
- Exact alarm text
- Alarm priority
- Diagnostic or service codes
- Time of occurrence
- Whether the failure was continuous or intermittent
- Gas source being used
- Compressor indicators
- Results of the pre-use test
- Whether the failure occurred on multiple outlets
Do not clear logs before the repair technician has reviewed them.
Expected outcome: The repair team receives enough information to reproduce and diagnose the failure efficiently.
If the Problem Persists
If the Puritan Bennett 980 continues to report an air-supply, compressor, or gas-source failure after the facility source, hoses, connections, electrical supply, accessible filters, and compressor setup have been verified, common external causes have been ruled out.
The failure may involve an internal gas-pressure sensor, regulator, inlet assembly, compressor component, gas-delivery subsystem, wiring connection, or control circuit.
The ventilator should be:
- Removed from service
- Labeled Out of Service
- Sent for qualified bench evaluation or authorized repair
- Performance-tested before being returned to clinical use
Do not bypass gas-source alarms, internal sensors, regulators, or compressor safety devices. Knowing when to stop external troubleshooting is proper Clinical Engineering practice.
Clinical Use Tip
Never troubleshoot a PB980 gas-source failure while it remains connected to an active patient. Move the patient to a verified ventilator first and confirm effective ventilation and alarms before evaluating the affected unit.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory therapy reported that the Puritan Bennett 980 displayed an air-supply alarm and could not maintain normal operation using the room’s medical-air outlet."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the air hose quick-connect fitting was not fully seated, causing intermittent loss of inlet pressure."
Resolution
What action was taken.
Example:
"Reseated and inspected the air hose, verified the wall outlet, completed the ventilator pre-use test with a test lung, and confirmed that the alarm did not recur."
Helpful Details to Include (If Known)
- Exact alarm message and priority
- Diagnostic or service codes
- Wall outlet tested
- Facility gas pressure verified
- Alternate outlet tested
- Air hose inspected or replaced
- Known-good hose used
- Compressor power and indicators checked
- Intake or cooling obstruction found
- Unusual compressor sounds or vibration
- Unusual heat or burning smell
- Startup or short self-test results
- Test-lung results
- Whether the problem was intermittent
- Final device status
Final Thought
Air-supply failures require immediate attention because stable gas delivery is essential to safe ventilation. Begin with patient safety, verify the facility source and connections, test one component at a time, and escalate when the failure remains with the ventilator. Clear CCR documentation preserves the evidence needed for efficient repair.
That is successful troubleshooting.