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What This Guide Helps With
Error 345 Thermistor Disparity indicates a mismatch between internal temperature sensors. This can cause the pump to shut down or prevent operation due to unreliable temperature monitoring, which is critical for safe infusion delivery.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the pump from active patient use immediately
- Transfer infusion to another device if therapy is ongoing
Verify the Reported Error and Behavior
- Power on the pump and confirm Error 345 Thermistor Disparity is displayed
- Observe when the error occurs (startup, during operation, intermittently)
- Confirm the error is repeatable
Perform a Power Cycle
- Turn the pump off
- Wait 10–15 seconds
- Power the unit back on
Check for Environmental Factors
- Assess for exposure to extreme heat or cold
- Check for direct sunlight or proximity to warming devices
- Move the pump to a normal room-temperature environment if needed
Inspect External Condition of the Pump
- Look for signs of fluid ingress
- Check for cracks or housing damage
- Inspect for residue near seams or openings
Allow the Pump to Stabilize at Room Temperature
- If recently moved between environments, allow 15–30 minutes powered off
- Ensure internal components equalize in temperature
Attempt Basic Functional Check
- Power on the pump after stabilization
- Attempt normal operation without connecting to a patient
- Confirm whether the error clears
If the Problem Persists
If Error 345 continues after environmental and external checks, external causes have been ruled out and the issue likely indicates internal thermistor mismatch or sensor circuit failure.
- Remove the pump from service
- Label Out of Service
- Send for repair or bench evaluation
Clinical Use Tip
Never troubleshoot a pump with temperature-related errors on an active patient. Always transfer the patient to a backup device before attempting diagnostics.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Pump displaying Error 345 Thermistor Disparity at startup; unable to initiate infusion"
Cause
What was observed during troubleshooting.
Example:
"Persistent thermistor mismatch after power cycle and environmental stabilization; likely internal sensor fault"
Resolution
What action was taken.
Example:
"Removed from service, labeled Out of Service, and sent to Biomed/vendor for repair"
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Temperature-related errors are critical safety indicators. Always rule out environmental causes first, but escalate quickly when internal sensor faults are suspected. Proper documentation and timely removal from service protect patients and staff.
That is successful troubleshooting.