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Asset Type
Manufacturer
Advanced Sterilization Products (ASP)
Model
What This Guide Helps With
Troubleshoot plasma or RF-related cycle failures by ruling out power, load, moisture, chamber, door, and repeatable external conditions before service escalation.
Step-by-Step Troubleshooting
1. Protect the Load and Remove Clinical Dependency
A cycle that does not complete its required sterilization phases must not be considered successful.
Quarantine the affected load and move urgent processing to another validated method.
Expected outcome: No incompletely processed instruments are released for patient use.
2. Confirm the Exact Failure
Determine:
- Exact displayed message
- Phase where the failure occurs
- Whether the cycle always reaches the same point
- Whether all cycle types are affected
- Whether the failure began after power interruption, maintenance, relocation, or an unusual load
Do not assume an RF failure based only on an interrupted cycle unless the unit specifically indicates that system.
Expected outcome: The failure is accurately characterized before internal failure is suspected.
3. Verify Stable AC Power and Normal Startup
Check that the unit powers normally, completes startup, and remains stable.
Inspect the external power connection for obvious damage or looseness and determine whether recent facility power disturbances occurred.
Expected outcome: The sterilizer has stable power and no unrelated startup abnormality.
If power is unstable, correct the facility or external power condition before further testing.
4. Inspect the Load for Moisture and Improper Preparation
A wet or unsuitable load may interrupt processing before or during phases associated with plasma generation.
Verify items are dry, compatible, and prepared appropriately.
Expected outcome: The verification load is dry and properly prepared.
5. Verify Chamber Loading and Clearance
Check that the chamber is not overloaded and that trays, instruments, or packaging are not contacting areas they should not contact or obstructing normal chamber conditions.
Expected outcome: Load placement is appropriate and does not create an obvious external reason for cycle interruption.
6. Verify Door Closure and Chamber Condition
Inspect accessible door sealing surfaces and the chamber for debris, moisture, damage, or obstruction.
A vacuum or chamber-integrity problem can prevent the sterilizer from reaching later cycle phases.
Expected outcome: The chamber and door appear normal externally and the unit can proceed through earlier cycle phases.
7. Verify Cassette Acceptance
Confirm the hydrogen peroxide cassette is recognized and the sterilizer does not have a separate cassette or sterilant-delivery problem.
Expected outcome: The cassette is accepted and no independent cassette fault explains the interrupted cycle.
8. Repeat Only With an Approved Verification Condition
After correcting any external issues, perform an approved verification cycle.
Do not repeatedly expose full clinical loads to failed cycles while attempting to determine whether the RF/plasma system will recover.
Expected outcome: The verification cycle progresses through all required phases and completes successfully.
If the cycle completes normally and the corrected external cause does not recur, troubleshooting can stop.
9. Stop if the RF/Plasma Failure Repeats
If the same RF/plasma-related failure returns with a correctly prepared verification load and external causes are ruled out, stop further cycling.
Do not open RF assemblies, adjust internal generators, access high-voltage components, or perform board-level troubleshooting.
Expected outcome: A likely service-level failure is identified without unsafe internal access.
10. Escalate to Qualified Service
Persistent plasma or RF faults may involve RF generation, matching, sensing, electrical control, chamber conditions, vacuum performance, or related internal circuitry.
Expected outcome: The device is removed from use and transferred for qualified evaluation.
If the Problem Persists
Common external causes have been ruled out. Plasma and RF systems involve internal electrical and high-energy components that are outside routine external Clinical Engineering troubleshooting.
The sterilizer should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or qualified service evaluation
- Evaluated using appropriate ASP documentation and approved test equipment
- Repaired only by qualified personnel
Following repair, complete all manufacturer- and facility-required functional and process verification before clinical return.
Knowing when to stop rather than enter high-energy internal circuitry is proper troubleshooting.
Clinical Use Tip
Treat any cycle that fails before completion as unsuccessful regardless of how far the cycle progressed.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Sterile Processing reported repeated STERRAD 100NX cycle failures when the unit reached the plasma portion of processing."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering verified stable power, a dry approved test load, proper door closure, and normal cassette recognition, but the plasma-related failure repeated."
Resolution
What action was taken.
Example:
"The sterilizer was removed from service, labeled Out of Service, and referred for ASP-qualified service evaluation before any return to clinical use."
Helpful Details to Include (If Known)
- Exact displayed message
- Cycle and phase of failure
- AC power condition
- Recent power event
- Load condition
- Moisture observed
- Door and chamber condition
- Cassette status
- Number of repeated failures
- Result of approved verification cycle
- Final device status
Final Thought
A plasma or RF message does not eliminate the need to rule out simpler causes such as power, moisture, chamber, load, and cassette conditions. Once those are verified and the fault repeats, escalation rather than internal high-energy repair is the correct Clinical Engineering response.
That is successful troubleshooting.