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What This Guide Helps With
Error 322 Link Switch Error (low) indicates the lower link switch is not activating. This prevents proper cassette detection and can stop the pump from operating safely due to incorrect door or latch position sensing.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the pump from patient use.
- If infusion is active, immediately transfer to a backup pump.
- Confirm therapy continues safely on another device.
Verify the Reported Error and Behavior
- Power on the pump and attempt to load a cassette.
- Confirm message: Error 322 Link Switch Error (low).
- Observe when the error occurs (startup, door closure, or operation).
- Determine if the issue is consistent.
Inspect Door and Latch Mechanism
- Open and close the pump door several times.
- Check for smooth movement and proper engagement.
- Look for looseness, resistance, or incomplete closure.
Check for Obstructions or Debris
- Inspect cassette loading area for residue or debris.
- Look for dried IV fluid or buildup near latch components.
- Clean using approved cleaning methods if needed.
Verify Cassette Installation
- Insert a known-good Baxter cassette.
- Ensure cassette is fully seated and aligned.
- Confirm door is completely closed and latched.
Test with Another Cassette
- Use a different known-good cassette.
- Compare behavior to rule out cassette-related issues.
Observe Mechanical Linkage Movement
- Watch for internal linkage movement during door closure.
- Listen and feel for normal engagement.
- Check for lack of movement or abnormal feel.
Perform Power Cycle
- Turn the pump off.
- Wait 10–15 seconds.
- Power the unit back on and retest.
If the Problem Persists
If all external checks, cleaning, and cassette verification steps have been completed and the error remains, the lower link switch or internal linkage is likely faulty.
- Remove the device from service
- Label the device Out of Service
- Send for repair or bench evaluation
Clinical Use Tip
Never troubleshoot on an active patient. Always transfer the patient to a backup infusion pump before beginning troubleshooting.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Pump displaying Error 322 Link Switch Error (low) when loading cassette; infusion unable to start."
Cause
What was observed during troubleshooting.
Example:
"Lower link switch not activating. Verified door function, cassette seating, and no obstruction. Issue consistent with internal switch or linkage failure."
Resolution
What action was taken.
Example:
"Cleaned cassette area, verified proper cassette installation, tested with known-good cassette, and power cycled unit. Error persisted. Removed 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
Link switch errors indicate the pump cannot verify safe cassette engagement. Always perform simple mechanical checks first, but escalate quickly when the issue is consistent. Reliable detection systems are critical for safe infusion therapy.
That is successful troubleshooting.