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What This Guide Helps With
Troubleshoots predictive measurement or probe-conditioning problems caused by accessories, probe state, mode, contamination, environment, batteries, or internal faults.
Step-by-Step Troubleshooting
1. Protect the Patient and Use Another Verified Thermometer
Do not use the thermometer for patient assessment when predictive measurement fails, the probe does not condition normally, or results are delayed or unstable. Provide another verified thermometer.
Expected outcome: Patient care continues without relying on an uncertain predictive measurement system.
2. Confirm the Exact Failure
Ask staff whether the device displays an error, fails to enter predictive mode, remains in an alternate measurement state, takes unusually long, or produces inconsistent readings.
Document the probe type, selected mode, measurement site, and displayed indicators.
Expected outcome: The reported predictive or probe-conditioning failure is reproduced and defined.
3. Verify the Correct Probe and Probe Well
Confirm that the installed probe and probe well are compatible with the SureTemp Plus 692 and the intended measurement application. Inspect for mismatched colors, incorrect accessories, or substituted components.
Expected outcome: The correct accessory combination is installed. If correcting the mismatch restores predictive operation, proceed to final verification.
4. Verify Probe Recognition and Storage Detection
Insert the probe fully into the well and confirm normal storage detection. Remove it and verify that the thermometer enters the expected ready state without a probe error.
A storage-detection fault may prevent proper probe preparation or predictive operation.
Expected outcome: Probe storage and removal are recognized consistently.
5. Inspect and Clean the Probe
Inspect the probe tip, cable, body, connector, and strain relief for contamination, moisture, cracks, or damage. Clean and dry external surfaces using approved procedures.
Do not apply direct heat to the probe or immerse it unless specifically allowed.
Expected outcome: The probe is clean, dry, intact, and securely connected.
6. Confirm Proper Probe-Cover Installation
Install one correct compatible probe cover and verify it is fully seated. Check for doubled, loose, wrinkled, damaged, or contaminated covers.
Expected outcome: The probe cover fits correctly and does not interfere with temperature sensing.
7. Verify the Intended Measurement Mode
Confirm that the selected mode matches the measurement site and patient population. A different mode may use a different measurement behavior and be mistaken for predictive failure.
Expected outcome: The intended predictive mode is selected and remains displayed.
8. Allow the Probe and Device to Stabilize
If the thermometer was moved from a hot, cold, or high-airflow environment, allow it to stabilize in normal room conditions. Keep it away from direct sunlight, heating vents, and cold exterior walls.
Expected outcome: Environmental temperature does not interfere with probe conditioning or predictive calculations.
9. Verify Battery Condition
Install fresh, matched, correct batteries and inspect the contacts. Unstable power can affect measurement processing and probe-related operation.
Expected outcome: The thermometer has stable power and no low-battery indication.
10. Test With a Known-Good Compatible Probe
Install a verified compatible probe and repeat the test with an approved simulator or manufacturer-authorized verification setup.
Expected outcome: Predictive measurement operates normally with the known-good probe, identifying the original probe as defective, or the failure remains and indicates a device-side problem.
11. Perform Repeated Approved Functional Measurements
Complete several controlled measurements and confirm the device enters the expected mode, progresses normally, completes the cycle, and produces stable verified results.
Do not touch the probe tip to judge whether a heater is operating, and do not apply external heat as a diagnostic method.
Expected outcome: Predictive measurement completes consistently and passes approved verification. If so, troubleshooting can stop.
12. Stop and Escalate Confirmed Predictive Failure
If the failure remains with known-good accessories, fresh batteries, correct mode, proper probe storage, and stable environmental conditions, remove the thermometer from service.
Expected outcome: The thermometer is routed for qualified internal evaluation rather than returned to clinical use.
If the Problem Persists
External causes involving probe type, probe well, storage detection, probe covers, mode, contamination, batteries, and environment have been ruled out. The remaining condition may involve probe-conditioning control, internal sensing circuitry, prediction-processing electronics, stored calibration data, or another service-level fault.
Remove the thermometer 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 repairs, calibration, and protected configuration should be completed only by qualified personnel.
Before return to service, verify normal probe recognition, storage detection, predictive measurement initiation, repeated cycle completion, all required modes, and temperature accuracy. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Do not substitute repeated patient measurements for technical verification when predictive operation is questionable; move immediately to another verified thermometer.
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 would not complete predictive temperature measurements."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found that the probe was not seating fully in the probe well because the well was obstructed by dried residue."
Resolution
What action was taken.
Example:
"Clinical Engineering cleaned the probe well, confirmed normal probe storage detection, and verified repeated predictive measurements with acceptable temperature results."
Helpful Details to Include (If Known)
- Exact error or displayed mode
- Probe and probe-well type
- Probe-storage detection
- Probe and connector condition
- Probe-cover condition
- Selected measurement mode
- Environmental conditions
- Battery condition
- Known-good probe result
- Repeated predictive-test results
- Final accuracy-verification result
- Final device status
Final Thought
Predictive measurement depends on correct accessories, probe storage, mode, clean sensing surfaces, stable power, and suitable environmental conditions. Verify these external causes first, then stop and escalate when controlled testing remains unsuccessful.
That is successful troubleshooting.