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What This Guide Helps With
Error 305 DS rdng out of range (low) indicates a low downstream sensor reading that may prevent infusion from starting or continuing. This can be caused by cassette misalignment, improper setup, flow path issues, or a downstream sensor fault.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the pump from active patient use if infusion is interrupted or unreliable
- Transfer infusion to a functioning pump if therapy is ongoing
Verify the Reported Error and Behavior
- Power on the pump and confirm Error 305 DS rdng out of range (low) is displayed
- Observe when the error occurs (startup, set loading, or infusion)
- Check for symptoms such as inability to start infusion or repeated alarms
Check IV Set Installation
- Open the pump door and inspect cassette placement
- Ensure cassette is fully seated and aligned in the channel
- Verify the door is fully latched
- Remove and reload the IV set carefully
Inspect IV Set and Cassette Condition
- Check for cracks, deformities, or damage to the cassette
- Ensure there is no air in the line near the cassette
- Verify the set is properly primed
- Replace with a new, known-good IV set if needed
Check for Flow Obstruction or Open Line
- Inspect downstream tubing for kinks or clamps
- Ensure tubing is connected and not open to air
- Confirm proper priming and fluid path continuity
Clean Sensor Area (External Only)
- Inspect the pump channel where the cassette sits
- Look for fluid residue, debris, or contamination
- Clean using approved methods if necessary
Power Cycle the Pump
- Turn the pump off
- Wait a few seconds
- Restart the pump and check for the error
Isolate Accessory vs Device Issue
- If the error resolves with a new IV set, the issue is accessory-related
- If the error persists across multiple sets, the issue is device-related
If the Problem Persists
If external causes such as IV set installation, tubing condition, and environment have been ruled out and Error 305 continues, this indicates a likely internal downstream sensor fault or calibration issue.
- Remove the device from service
- Label the device Out of Service
- Send for repair or bench evaluation
Clinical Use Tip
Never troubleshoot infusion pump cassette or sensor issues while the device is connected to a patient. Always transfer therapy to a backup pump before performing checks.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Pump displaying Error 305 DS rdng out of range (low); infusion would not start."
Cause
What was observed during troubleshooting.
Example:
"Error persisted after multiple IV set replacements and proper loading; suspected downstream sensor fault."
Resolution
What action was taken.
Example:
"Removed from service, labeled out of 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
Error 305 DS rdng out of range (low) is often caused by setup or cassette issues but can indicate a deeper sensor failure if persistent. Always start with external checks, prioritize patient safety, and escalate appropriately when needed.
That is successful troubleshooting.