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What This Guide Helps With
This guide helps troubleshoot Error 120.4310 Low voltage on 24V supply line on the BD Alaris Infusion Pump. This condition indicates insufficient internal power supply voltage, which can cause pump instability, charging failure, module communication issues, or complete loss of operation.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the pump from active patient use if power instability is present
- Transfer infusion to a functioning device
- Ensure therapy is not interrupted
Verify the Reported Error and Behavior
- Power on the pump and confirm Error 120.4310 is displayed
- Observe when the error occurs (startup vs during operation)
- Check for resets, shutdowns, or communication loss between modules
Check AC Power Source (Main PCU)
- Plug the PCU into a known working outlet
- Test the outlet using another device
- Confirm AC indicator is present on the PCU
- Ensure the power cord is fully inserted
Inspect Power Cord and Inlet
- Check for bent pins, loose fit, or damaged insulation
- Swap with a known-good hospital-grade power cord
- Verify secure connection at both ends
Check Battery Status
- Operate the PCU on battery power
- Observe if the unit shuts down quickly or behaves erratically
- Reconnect AC power and verify charging indicators
Remove All Attached Modules
- Detach all infusion modules from the PCU
- Power the PCU alone and observe behavior
- Reconnect modules one at a time
Inspect Module Connections and Contacts
- Ensure modules are fully seated and locked
- Inspect connectors for contamination or bent contacts
- Verify proper alignment of modules
Inspect for Physical Damage or Fluid Intrusion
- Check for spills near power input or module connections
- Look for burn marks, odor, or signs of overheating
- Inspect housing for cracks or damage
Power Cycle the System
- Shut down the PCU
- Disconnect AC power for at least 30 seconds
- Reconnect and restart the system
If the Problem Persists
If Error 120.4310 continues after all external checks:
- External power, battery, and module-related causes have been ruled out
- This indicates an internal PCU power supply or voltage regulation failure
- Remove the device from service
- Label the unit Out of Service
- Send for repair or bench evaluation
Clinical Use Tip
Never troubleshoot power-related errors on an active patient. Always transfer the patient to a backup device before performing any checks.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"BD Alaris PCU displaying Error 120.4310 with intermittent shutdowns during infusion."
Cause
What was observed during troubleshooting.
Example:
"Verified AC power, cord, battery, and modules. Error persisted, indicating internal 24V supply failure."
Resolution
What action was taken.
Example:
"Removed PCU from service and sent for repair and evaluation."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Low voltage errors in the Alaris system can originate from external power issues, battery degradation, or module loading conditions. Always rule out these external factors before determining an internal failure requiring repair.
That is successful troubleshooting.