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What This Guide Helps With
Troubleshooting sterilant-delivery failures caused by supply recognition, installation, damage, expiration, obstruction, load conditions, or internal delivery-system faults.
Step-by-Step Troubleshooting
1. Protect Staff and the Affected Load
A cycle with failed sterilant delivery is not complete or sterile.
Notify Sterile Processing leadership.
Segregate the affected load for complete reprocessing.
Do not open the chamber until automatic recovery is complete.
Redirect urgent items to another verified compatible sterilizer.
If sterilant leakage, strong odor, visible residue, or damaged packaging is present, restrict access and follow facility hazardous-material procedures.
Expected outcome: Staff are protected from exposure and no incomplete load enters patient care.
2. Record the Exact Failure
Review and preserve:
- The complete displayed message.
- The cycle phase.
- The sterilant status shown before the cycle.
- The cycle type.
- Whether the failure occurred immediately or after conditioning.
- Whether the problem followed a sterilant replacement.
- Whether the issue affects every cycle.
Expected outcome: The failure is documented before the supply or load is disturbed.
3. Allow Automatic Recovery to Complete
Do not interrupt power.
Permit aeration, pressure equalization, and chamber recovery to finish.
Keep the door closed and locked until the control allows safe access.
Preserve the aborted-cycle record.
Do not attempt another cycle immediately.
Expected outcome: The chamber reaches a safe state for inspection.
4. Inspect the Sterilant Supply Status
Use only operator-accessible information.
Check whether the sterilizer reports empty, expired, rejected, damaged, or improperly installed sterilant.
Confirm the correct approved sterilant product is present.
Verify the container or cassette is within its permitted use condition as indicated by the system.
Do not override rejection messages.
Do not transfer, refill, puncture, or reuse the supply.
Expected outcome: The sterilant supply is acceptable and recognized by the sterilizer.
5. Inspect Sterilant Packaging and Loading Area
Using appropriate personal protective equipment and facility procedures:
Look for damaged packaging, leakage, residue, swelling, or contamination.
Inspect the accessible loading compartment for foreign material.
Confirm the supply is oriented and seated correctly.
Remove a damaged or leaking container from use according to hazardous-material procedures.
Do not reach into or disassemble the injection mechanism.
Expected outcome: The supply is intact, correctly installed, and the accessible loading area is clean and unobstructed.
6. Remove and Reinstall the Supply When Permitted
If no leakage or damage is present:
Follow the normal operator-accessible removal process.
Inspect the supply and compartment.
Reinstall it fully.
Confirm the sterilizer recognizes it.
Replace it with a new approved supply when the original is rejected or questionable.
Expected outcome: The sterilizer displays an accepted sterilant supply. If correct seating restores operation, continue with a test cycle.
7. Check for Load-Related Conditions
Although the message concerns delivery, verify the load.
Confirm the load is dry and compatible.
Ensure trays do not contact the door or interfere with chamber operation.
Check for overloading or dense packaging.
Verify the selected cycle is appropriate.
Remove the clinical load before diagnostic testing.
Expected outcome: Load conditions are ruled out as contributors to a process abort.
8. Inspect the Chamber and Door Seal Area
With the unit safely idle:
Check for debris, labels, packaging fragments, or residue.
Confirm the chamber is dry.
Inspect accessible sealing surfaces.
Verify the door closes and locks normally.
Do not remove covers or access internal fluid paths.
Expected outcome: The chamber is clean, dry, and properly sealed for testing.
9. Check Facility Environment and Power
Confirm stable electrical power.
Verify room ventilation is operating.
Ask whether facility work, HVAC issues, or power events occurred.
Check whether similar sterilizers are affected.
Coordinate with Facilities when a common environmental or utility issue is suspected.
Expected outcome: Facility conditions support normal sterilizer operation.
10. Run an Approved Test Cycle
After an accepted sterilant supply is installed:
Use an approved empty or test load.
Observe progression through conditioning and sterilant delivery.
Record any repeated message.
Stop after one repeated delivery failure.
Do not test repeatedly with clinical devices.
Expected outcome: The sterilant is accepted and the test cycle completes through all phases without delivery alarms.
11. Verify the Complete Cycle Result
Before returning the sterilizer to use:
Confirm a successful cycle result.
Verify the cycle record and printout or electronic record.
Confirm normal door locking and release.
Inspect the chamber for abnormal residue or odor.
Confirm the sterilant status updates normally.
Expected outcome: Sterilant delivery, cycle completion, documentation, and safe chamber operation are fully verified.
If the Problem Persists
If the approved sterilant supply is intact, correctly installed, recognized, and the chamber, door, load, power, and environment are acceptable, common external causes have been ruled out.
The remaining cause may involve the internal injection mechanism, delivery valves, sensors, fluid path, pressure system, control electronics, or protected configuration.
The sterilizer should be:
- Removed from service.
- Labeled Out of Service.
- Sent for qualified repair or field evaluation.
- Evaluated using appropriate STERIS documentation and approved test equipment.
- Repaired or configured only by qualified personnel.
Do not open sterilant fluid paths, bypass recognition, manually activate delivery components, or continue repeated cycles. Follow hazardous-material procedures for any suspected leak and complete all required process verification after repair.
Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Treat any suspected sterilant-delivery failure as an incomplete cycle and reprocess the entire load from the beginning.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Sterile Processing reported that the V-PRO aborted with a sterilant-delivery message shortly after a new sterilant supply was installed."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found that the approved sterilant cassette was not fully seated and was not consistently recognized."
Resolution
What action was taken.
Example:
"The cassette was removed, inspected, correctly reinstalled, and an approved test cycle completed with normal delivery and a successful cycle record."
Helpful Details to Include (If Known)
- Exact sterilant message
- Cycle phase
- Sterilant status before failure
- Supply type and condition
- Installation or seating condition
- Leakage, residue, or odor
- Recent supply replacement
- Chamber and seal condition
- Load type and dryness
- Facility power or ventilation issue
- Test-cycle result
- Final service status
Final Thought
Protect staff from exposure and treat the load as failed. Rule out sterilant recognition, installation, packaging damage, chamber conditions, load preparation, and utilities before escalating an internal delivery-system fault.
That is successful troubleshooting.