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What This Guide Helps With
Error 309 No-tube rdg too high indicates the pump falsely detects tubing or fluid when none is present. This prevents operation and compromises air-in-line detection, which is critical for safe infusion delivery.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the pump from patient use immediately
- Transfer infusion to a backup pump if therapy is active
Verify the Reported Error and Behavior
- Power on the pump and confirm Error 309 No-tube rdg too high is displayed
- Observe if the error occurs at startup or when the door is closed without tubing
- Confirm the condition is consistent and reproducible
Inspect the Pump Channel for Obstruction or Contamination
- Open the pump door and inspect the tubing channel
- Look for residual IV fluid, dust, dirt, or dried medication
- Clean the channel using approved wipes
Check for Moisture or Fluid Intrusion
- Inspect the sensor area for liquid or damp surfaces
- Look for sticky residue or buildup
- Allow the pump to fully dry if moisture is present
Verify Door and Latch Function
- Close the pump door securely
- Ensure proper latch engagement with no gaps or misalignment
- Open and close multiple times to confirm consistent operation
Perform a Power Cycle
- Turn the pump off completely
- Wait 10–15 seconds
- Power the pump back on
Test Without Tubing Installed
- Close the door with no tubing present
- Power on and observe if tubing is falsely detected
- Confirm whether the error persists
If the Problem Persists
If Error 309 continues after all external checks, contamination, moisture, and door alignment have been ruled out, the sensor system is likely misreading internally.
- Remove the device from service
- Label the unit as Out of Service
- Send for repair or bench evaluation
Clinical Use Tip
Never troubleshoot or rely on a pump with air-in-line or detection errors while connected to a patient. Always transition to a backup device before addressing the issue.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Pump displaying Error 309 'No-tube rdg too high' and indicating tubing present when none is installed."
Cause
What was observed during troubleshooting.
Example:
"False high reading from no-tube sensor. Channel clean and dry, door functioning normally. Issue persists with no tubing installed."
Resolution
What action was taken.
Example:
"Removed from service and sent for repair after confirming persistent false detection condition."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
False detection errors indicate a loss of trust in critical sensing systems. Always rule out contamination and environmental factors first, but escalate quickly when detection remains unreliable.
That is successful troubleshooting.