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What This Guide Helps With
This guide addresses the “Too Long In Exhaust” alarm condition where the chamber fails to reach approximately 4 psig within the expected time, resulting in extended exhaust phases and potential incomplete sterilization cycles.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Do not use instruments from a failed or alarmed cycle
- Remove the sterilizer from service if cycle reliability is uncertain
- Ensure alternative sterilization methods are available
Verify the Reported Alarm and Behavior
- Confirm “Too Long In Exhaust” alarm is displayed
- Observe that it occurs during the exhaust phase
- Check that chamber pressure does not drop to ~4 psig within expected time
- Note if the unit attempts to extend exhaust time automatically
Check Chamber Drain Strainer (Most Common Cause)
- Inspect for debris, scale, or buildup
- Remove and clean thoroughly if obstructed
- Reinstall securely after cleaning
Inspect Drain and Exhaust Path
- Check for kinks or restrictions in piping
- Look for partial blockages downstream
- Verify proper flow through drain system
Evaluate Load Conditions
- Ensure chamber is not overloaded
- Verify proper tray spacing
- Avoid dense packs that restrict airflow
Verify Door Gasket and Seal Condition
- Inspect gasket for debris or residue
- Check for wear or damage
- Ensure proper seating and seal integrity
Attempt a Test Cycle
- Run a cycle after cleaning and inspection
- Verify chamber reaches ~4 psig within normal exhaust time
- Confirm alarm does not recur
If the Problem Persists
If all external causes have been ruled out:
- Possible solenoid valve malfunction (S03)
- Control system out of calibration
- Remove the sterilizer from service
- Label the device Out of Service
- Send for qualified repair or calibration
Clinical Use Tip
Never troubleshoot or release instruments from a sterilizer that alarmed during a cycle. Always move to a backup sterilizer before continuing clinical operations.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Sterilizer alarming 'Too Long In Exhaust'; chamber not reaching ~4 psig and extending exhaust phase."
Cause
What was observed during troubleshooting.
Example:
"Chamber drain strainer clogged, restricting exhaust flow and slowing depressurization."
Resolution
What action was taken.
Example:
"Cleaned drain strainer and verified exhaust path; test cycle completed successfully without alarm."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
This alarm indicates a failure to properly depressurize the chamber, which directly impacts sterilization effectiveness. Always rule out flow restrictions first, then escalate to internal component or calibration issues.
That is successful troubleshooting.