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What This Guide Helps With
Error 120.4330 indicating low 5V supply, causing pump startup failure, rebooting, or loss of module/system functionality.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the pump from patient use immediately if actively infusing
- Transfer infusion to a functioning pump or channel
Verify the Reported Error and Behavior
- Power on the Alaris PC unit and confirm Error 120.4330 appears
- Observe if the issue occurs at startup or during operation
- Determine if it affects the entire PC unit or specific modules
- Look for rebooting, blank screen, or failed initialization
Check AC Power Source and Power Cord
- Plug the PC unit into a known good outlet
- Ensure the power cord is fully seated at the rear inlet
- Inspect for damage, fraying, or loose connections
- Try a known-good hospital-grade cord
Check Battery Status
- Review battery indicators or system status if accessible
- Power off and reseat the battery (biomed access only)
- Inspect for swelling, overheating, or damage
- Swap with a known-good battery if available
Power Cycle the System
- Shut down the PC unit
- Disconnect AC power for 30–60 seconds
- Reconnect power and restart the unit
Remove All Modules and Retest
- Detach all infusion modules from the PC unit
- Power on the PC unit alone
- Reattach modules one at a time
- Identify if a specific module triggers the error
Inspect for Physical or Environmental Damage
- Check for liquid intrusion
- Inspect module connectors for bent pins or damage
- Look for signs of overheating or impact
Isolate the Issue
- If resolved with power cord replacement, suspect external power issue
- If resolved after removing a module, identify faulty module
- If persistent with no modules and known-good power, suspect internal PC unit failure
If the Problem Persists
If Error 120.4330 continues after all external checks:
- Remove the PC unit from service
- Label the device as Out of Service
- Send for repair or bench evaluation
Persistent low 5V supply indicates internal power supply or regulation failure within the PC unit.
Clinical Use Tip
Never troubleshoot power-related errors on an active patient. Always transfer infusion to a backup device first to prevent therapy interruption.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"BD Alaris PC unit displaying Error 120.4330 and intermittently rebooting."
Cause
What was observed during troubleshooting.
Example:
"Error persisted after verifying AC power and removing all modules, indicating internal 5V supply fault."
Resolution
What action was taken.
Example:
"Removed PC unit from service and sent for internal power supply repair."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Stable low-voltage rails are critical for Alaris system operation. Always rule out external power and module-related causes first, but persistent voltage errors typically require escalation for internal repair.
That is successful troubleshooting.