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What This Guide Helps With
Error: LOCK AGAIN indicating floor lock failure due to pressure switch not changing state, preventing proper table stabilization or locking.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the surgical table from patient use immediately if the floor lock is not functioning properly
- Transfer the patient to a stable surface or backup table
Verify the Reported Error and Behavior
- Power on the table and attempt to activate the floor lock
- Check for “LOCK AGAIN” message on display
- Observe if the table fails to lock or stabilize
- Confirm repeated attempts produce the same result
Check for External Hydraulic Oil Leakage
- Inspect the base of the table and surrounding floor area
- Look for visible oil leaks
- Check hydraulic lines and fittings
Inspect Floor Lock Operation Physically
- Listen for hydraulic pump activation when engaging lock
- Observe for any movement of floor lock feet
- Note abnormal sounds such as straining or no response
Check Pressure Switch Wiring and Connections
- Inspect accessible wiring for the pressure switch
- Ensure connectors are fully seated
- Look for damaged or pinched wires
- Reseat any loose connections
Rule Out Control/Input Issues
- Test both hand control and foot control
- Ensure no conflicting inputs are being sent
- Verify consistent behavior across controls
Stop if the Issue is Resolved
- If function returns, clear the error
- Cycle lock/unlock multiple times
- Return table to service only after consistent operation
If the Problem Persists
If external causes such as oil leaks, wiring issues, and control inputs have been ruled out:
- This indicates internal failure of the floor lock valve block or pressure sensing system
- Remove the device from service
- Label the device as Out of Service
- Send for repair or bench evaluation
Clinical Use Tip
Never troubleshoot or cycle the floor lock while a patient is on the table. Always transfer the patient to a backup device before performing checks.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Table displaying 'LOCK AGAIN' error. Floor lock not engaging."
Cause
What was observed during troubleshooting.
Example:
"No external leaks or wiring issues found. Pressure switch not changing state, indicating likely valve block or sensor failure."
Resolution
What action was taken.
Example:
"Removed table 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
Floor lock errors are critical safety issues that must be addressed immediately. Always begin with visible hydraulic and wiring checks, but recognize when internal failures require escalation to ensure safe operation.
That is successful troubleshooting.