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What This Guide Helps With
Troubleshoots an unrecognized temperature probe, probe-related error, damaged connection, incompatible probe, contamination, or external accessory failure.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Temperature-Monitoring Continuity
Do not continue using the thermometer for clinical decisions when the probe is not recognized or the displayed temperature cannot be trusted. Remove it from patient use and provide staff with another verified thermometer.
Inspect for liquid intrusion, cracked housings, exposed conductors, overheating, unusual odor, or other visible damage. Remove the device from service immediately if any unsafe condition is present.
Expected outcome: Patient care continues with a verified alternate thermometer, and the affected device is safe to evaluate.
2. Confirm the Exact Reported Condition
Ask clinical staff when the problem occurs and document any displayed message or symbol. Determine whether the probe is never recognized, becomes recognized intermittently, or produces an error only when removed from the probe well.
Power the thermometer on and reproduce the condition without using it on a patient.
Expected outcome: The exact probe-recognition symptom is confirmed under controlled conditions. If the device now recognizes the probe consistently, complete functional verification before returning it to service.
3. Verify the Probe Type and Compatibility
Confirm that the attached probe is intended for the SureTemp Plus 692 and is appropriate for the installed probe well and measurement application. Inspect for incorrect, substituted, or visibly modified accessories.
Do not force an incompatible connector into the thermometer.
Expected outcome: The correct compatible probe and probe well are installed. If replacing an incorrect accessory restores recognition, troubleshooting can stop after final verification.
4. Inspect the Probe and Cable
Examine the entire probe cable for cuts, crushing, severe kinks, stretched sections, discoloration, exposed conductors, or damage near strain-relief points. Inspect the probe tip and body for cracks, contamination, bent components, or evidence of liquid intrusion.
Clean external surfaces according to approved infection-control and manufacturer guidance. Do not immerse components unless specifically permitted.
Expected outcome: The probe and cable are clean, intact, and free of visible damage. A damaged probe must be replaced before further testing.
5. Inspect and Reseat the Probe Connection
Power the thermometer off. Disconnect the probe using the correct release method, then inspect the plug and device receptacle for debris, moisture, corrosion, bent contacts, pushed-back contacts, or damaged plastic alignment features.
Allow any approved cleaning agent to dry fully. Reconnect the probe firmly without excessive force, then restart the thermometer.
Expected outcome: The connection is fully seated and the probe is recognized. If normal operation returns and remains stable, proceed to final functional verification.
6. Check the Probe Well and Storage Position
Verify that the correct probe well is fully installed and not cracked, loose, contaminated, or obstructed. Confirm that the probe can be inserted and removed normally without binding.
A probe well or storage fault may affect how the thermometer detects probe removal and initiates measurement.
Expected outcome: The correct probe well is secure, unobstructed, and properly detects probe storage and removal. If correcting the well resolves the error, troubleshooting can stop after final testing.
7. Test With a Known-Good Compatible Probe
Install a known-good compatible probe that has been verified on another SureTemp Plus 692, when available. Avoid using a probe with an uncertain history.
Observe whether the thermometer recognizes the known-good probe through several insertion and removal cycles.
Expected outcome: The known-good probe is recognized consistently. If it works normally, replace the original probe and complete functional verification.
8. Compare the Suspect Probe on Another Compatible Thermometer
When safe and practical, connect the suspect probe to another verified compatible SureTemp Plus 692. Use infection-control precautions and do not cross-contaminate accessories.
This comparison helps separate a probe failure from a thermometer-side connection or detection problem.
Expected outcome: The suspect probe either fails on the second device, confirming an accessory problem, or works normally, indicating the original thermometer requires further evaluation.
9. Perform a Controlled Functional Check
With the recognized probe installed, verify that removing the probe from the well initiates the expected measurement-ready condition. Confirm that the device completes a nonpatient functional measurement using an approved temperature simulator or manufacturer-authorized verification method.
Do not use informal comparisons against room temperature, hands, or unverified household thermometers as a calibration determination.
Expected outcome: The probe is recognized, the measurement cycle begins normally, and the device produces a stable result using approved verification equipment.
10. Stop and Escalate When Recognition Remains Unreliable
If the error remains after checking compatibility, condition, cleanliness, seating, the probe well, and a known-good probe, do not continue swapping accessories indefinitely or open the device for board-level troubleshooting.
Expected outcome: An unresolved or intermittent thermometer is removed from service and routed for qualified bench evaluation.
If the Problem Persists
Common external causes have been ruled out. The remaining problem may involve the probe receptacle, probe-detection circuitry, internal connections, damaged storage-detection components, or another service-level fault.
Remove the thermometer from service, label it Out of Service, and send it for repair or bench evaluation. Evaluate it using the appropriate Welch Allyn service documentation and approved test equipment. Repairs and configuration changes should be performed only by qualified personnel.
After corrective work, verify probe recognition, probe-well detection, measurement initiation, display operation, and temperature accuracy using an approved verification method before returning the thermometer to clinical use. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Move the patient to another verified thermometer whenever probe recognition is uncertain; an intermittent connection can invalidate temperature assessment without obvious warning.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the SureTemp Plus 692 displayed a probe error and would not begin a temperature measurement."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found that the probe connector was not fully seated and contained dried surface contamination around the connection."
Resolution
What action was taken.
Example:
"Clinical Engineering cleaned and dried the external connection, reseated the probe, and verified consistent probe recognition and successful temperature verification testing."
Helpful Details to Include (If Known)
- Exact probe error message or symbol
- Probe type and color
- Probe and cable condition
- Condition of the connector and receptacle
- Probe well type and condition
- Whether the issue was constant or intermittent
- Known-good probe substitution result
- Suspect probe comparison result
- Results of approved temperature verification
- Final device status
Final Thought
Protect the patient first, then verify the probe, cable, connector, probe well, and compatibility before assuming an internal failure. Stop when recognition remains unreliable, escalate appropriately, and document the confirmed complaint, cause, corrective action, and final test result.
That is successful troubleshooting.