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What This Guide Helps With
Troubleshoots failure to detect the probe well or stored probe due to installation, contamination, damage, obstruction, or sensing problems.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Continuity of Care
Do not troubleshoot a probe-storage detection problem while the thermometer is being relied upon for patient assessment. Remove it from clinical use and provide another verified thermometer.
Inspect the thermometer, probe well, probe, and cable for cracks, liquid intrusion, exposed conductors, or other unsafe conditions.
Expected outcome: Patient temperature monitoring continues with a verified alternative, and the affected thermometer is safe to inspect.
2. Confirm the Reported Storage Fault
Ask staff whether the thermometer fails to recognize that the probe is stored, fails to enter the expected mode when the probe is removed, or displays an error continuously. Document any message, symbol, or unusual behavior.
Reproduce the problem by carefully inserting and removing the probe several times.
Expected outcome: The exact failure point is identified. If the condition cannot be reproduced, inspect for intermittent fit or obstruction and complete repeated functional checks.
3. Verify the Correct Probe Well Is Installed
Confirm that the installed probe well is compatible with the attached probe and intended measurement application. Check for a mismatched, substituted, or improperly fitted well.
Do not modify or force the probe well into place.
Expected outcome: The correct probe well is installed. If installing the correct component restores normal detection, troubleshooting can stop after final verification.
4. Remove and Inspect the Probe Well
Power the thermometer off. Remove the probe well using the normal external removal method. Inspect it for cracks, warping, broken retaining features, contamination, foreign material, or an object lodged inside.
Clean or replace the probe well according to approved procedures. Allow it to dry completely before reinstallation.
Expected outcome: The probe well is clean, dry, undamaged, and free of obstruction.
5. Inspect the Probe-Well Mounting Area
Examine the accessible mounting area for debris, dried cleaning solution, damaged plastic, misalignment, or other conditions that prevent full seating. Do not insert metal tools or probe internal switches or contacts.
Remove only accessible external debris using approved cleaning methods.
Expected outcome: The mounting area is clean and unobstructed, allowing the well to seat fully.
6. Reinstall the Probe Well Correctly
Reinstall the well in the proper orientation and confirm it is fully seated and stable. It should not remain loose, rock excessively, or sit partially raised.
Restart the thermometer and observe whether the storage fault clears.
Expected outcome: The thermometer detects the installed probe well. If normal detection returns, proceed to repeated insertion and removal testing.
7. Inspect Probe Fit Within the Well
Insert the probe and verify that it reaches its normal stored position without excessive resistance. Check whether the cable or strain relief prevents complete insertion.
Inspect the probe body for cracks, deformation, or contamination that could interfere with proper storage.
Expected outcome: The probe seats fully and remains securely stored. If cleaning or replacing a damaged probe restores proper detection, troubleshooting can stop after final verification.
8. Test With a Known-Good Probe Well
Install a known-good compatible probe well, when available. Repeat several probe insertion and removal cycles while observing device behavior.
Expected outcome: The known-good well is detected consistently. If it resolves the fault, replace the original well and document the accessory failure.
9. Test With a Known-Good Compatible Probe
If the fault remains, test with a verified compatible probe. A damaged or misshapen probe body may prevent proper storage detection even when the well is functional.
Expected outcome: The known-good probe stores and removes normally. If it works, replace the original probe and complete final verification.
10. Verify Normal Measurement-State Transitions
With the probe stored, confirm the thermometer remains in its expected standby state. Remove the probe and verify that the device enters the appropriate measurement-ready condition. Return the probe to the well and confirm the cycle resets normally.
Expected outcome: The thermometer consistently detects stored and removed positions over multiple cycles. If so, troubleshooting can stop.
11. Escalate an Unresolved Detection Problem
If the fault remains with known-good compatible external components, do not disassemble the housing or attempt to bypass the storage-detection mechanism.
Expected outcome: The thermometer is removed from service and referred for service-level evaluation.
If the Problem Persists
External causes involving the probe well, installation, contamination, obstruction, probe fit, and accessory compatibility have been ruled out. The remaining condition may involve a damaged internal storage-detection mechanism, internal connection, housing alignment problem, or control circuitry.
Remove the device from service, label it Out of Service, and send it for repair or bench evaluation. Use appropriate Welch Allyn service documentation and approved test equipment. Internal repair or configuration should be performed only by qualified personnel.
Before return to service, verify probe-well detection, repeated probe insertion and removal, mode initiation, temperature measurement, display operation, and accuracy using an approved method. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
A thermometer that cannot reliably detect probe storage or removal may enter the wrong measurement state; use another verified device until the fault is corrected.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Nursing staff reported that the SureTemp Plus 692 did not recognize when the probe was placed in or removed from the probe well."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found that the probe well was partially unseated because dried residue was present in the mounting area."
Resolution
What action was taken.
Example:
"Clinical Engineering cleaned the accessible mounting area, reinstalled the probe well, and verified normal storage detection and repeated measurement initiation."
Helpful Details to Include (If Known)
- Exact storage-related message or symptom
- Probe well type and condition
- Probe type and condition
- Presence of debris or cleaning residue
- Whether the well was fully seated
- Known-good probe well test result
- Known-good probe test result
- Number of successful insertion and removal cycles
- Final measurement verification result
- Final device status
Final Thought
Begin with patient safety, then verify the correct probe well, cleanliness, seating, probe fit, and known-good accessories. Escalate when external corrections do not restore consistent storage detection, and clearly document the confirmed cause and final verification.
That is successful troubleshooting.