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What This Guide Helps With
Error 304 Bad Lower US rdg indicates an invalid lower ultrasonic sensor reading, which can cause flow detection failure, false alarms, or pump stoppage during operation.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
- Remove the pump from patient use immediately
- Transfer infusion to a functioning pump if therapy is active
- Confirm patient therapy continues without interruption
2. Verify the Reported Error and Behavior
- Power on the pump and confirm Error: 304 Bad Lower US rdg is displayed
- Observe when the error occurs (startup, priming, or infusion)
- Check for symptoms such as failure to start, repeated alarms, or intermittent operation
3. Check IV Set Installation and Compatibility
- Ensure a Baxter-approved IV set is installed
- Remove and reseat tubing in the pump channel
- Verify tubing is properly aligned in the ultrasonic sensor area
4. Inspect Tubing Condition
- Check for kinks, compression, or damage
- Look for air bubbles or cloudiness
- Replace the IV set if any defects are found
5. Check for Air-in-Line or Improper Priming
- Ensure tubing is fully primed with no air gaps
- Re-prime if necessary
6. Inspect Pump Channel and Sensor Area
- Open the pump door and inspect the lower sensor area
- Check for dried fluid, residue, or contamination
- Clean using approved methods
7. Power Cycle the Pump
- Turn the pump off
- Wait 10–15 seconds
- Restart the pump
8. Test with Known-Good Setup
- Install a new Baxter-approved IV set
- Run a test infusion off patient
- Confirm normal operation
If the Problem Persists
If Error 304 continues after verifying setup, replacing the IV set, and cleaning the sensor area, internal ultrasonic sensor failure or calibration issues are likely.
Remove the device from service, label it Out of Service, and send for repair or bench evaluation.
Clinical Use Tip
Never troubleshoot or rely on a pump with ultrasonic sensor errors while connected to a patient. Always transition to a known-good device first.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Pump displaying Error 304 Bad Lower US rdg and would not start infusion."
Cause
What was observed during troubleshooting.
Example:
"Lower ultrasonic sensor reading failure persisted after verifying IV set, tubing, priming, and cleaning sensor area."
Resolution
What action was taken.
Example:
"Replaced IV set, verified setup, cleaned sensor area, and power cycled with no resolution. Removed pump from service and sent for repair."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Ultrasonic sensor errors directly impact infusion accuracy and safety. Always rule out setup and accessory issues first, but escalate promptly when the problem persists.
That is successful troubleshooting.