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What This Guide Helps With
This guide addresses the alarm condition where the chamber temperature probe (RTD) output is outside the normal range, causing the sterilizer to abort the cycle due to invalid temperature readings. This directly impacts sterilization control and safety.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the sterilizer from service if the alarm occurs during a cycle
- Do not use any instruments from an aborted cycle
- Ensure alternative sterilization methods are available
Verify the Reported Alarm and Behavior
- Confirm the display shows: Chamber Temperature Probe Failure
- Observe if the cycle aborts automatically
- Check if temperature readings are missing, unstable, or incorrect
Inspect Accessible Probe Wiring Connections
- Check wiring connections to the RTD probe
- Look for loose connectors, damaged insulation, or corrosion
Check for Moisture or Contamination
- Inspect connectors for moisture or residue
- Ensure all connection points are clean and dry
Perform a Power Reset
- Power OFF the sterilizer
- Wait 30–60 seconds
- Power back ON and observe behavior
Determine if Issue is Wiring or Probe
- If wiring is damaged → repair and retest
- If wiring is intact → suspect RTD probe failure
Evaluate Calibration
- Consider if control calibration may be out of tolerance
- Look for slightly inaccurate or drifting readings
If the Problem Persists
If external causes have been ruled out and the alarm continues:
- RTD probe may have failed
- Control system may be out of calibration
- Main control board failure is possible
- Remove device from service
- Label Out of Service
- Send for qualified repair and recalibration
Clinical Use Tip
Never troubleshoot a sterilizer during an active patient load. Always move to a backup sterilization method before removing the unit from service.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Unit displayed Chamber Temperature Probe Failure alarm and aborted cycle; temperature readings invalid."
Cause
What was observed during troubleshooting.
Example:
"Loose RTD probe wiring connection identified, causing unstable signal."
Resolution
What action was taken.
Example:
"Repaired wiring and tested unit successfully, restoring normal operation."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Chamber temperature monitoring is critical to sterilization safety. Always rule out simple external causes first, but escalate promptly when internal sensor or control failures are suspected.
That is successful troubleshooting.