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Asset Type
Microbiology Identification System
Manufacturer
Model
What This Guide Helps With
Use this guide when the system does not detect an expected sample, card, rack, carrier, or other externally handled loading item.
Step-by-Step Troubleshooting
1. Protect Testing Integrity
Do not continue processing a patient specimen if the analyzer cannot reliably identify or detect the required sample-loading component.
Have laboratory staff retain or redirect the specimen according to their validated workflow while Clinical Engineering evaluates the equipment.
Expected outcome: Patient testing is protected from misidentification, missed processing, or incorrect sample association.
2. Confirm What Is Not Being Detected
Determine exactly what laboratory staff mean by “not detected.” Establish whether the problem involves:
- A single sample
- A specific rack or carrier
- Multiple samples
- A specific loading position
- All loading positions
- A recognition message rather than a mechanical loading problem
Record any displayed message exactly.
Expected outcome: The problem is narrowed to a specific item, position, or system-wide detection condition.
3. Inspect the Sample, Rack, or Carrier Externally
With the system in a safe state, inspect the affected item for:
- Damage
- Warping
- Contamination
- Improper assembly
- Incorrect orientation
- Missing or damaged identification features
- Obvious obstruction
Compare it with a known-good item when available.
Expected outcome: The item is intact, correctly assembled, clean, and suitable for use.
If replacing a damaged or improperly positioned external item restores detection, troubleshooting can stop after verification.
4. Verify Correct Loading and Positioning
Have trained laboratory personnel confirm the sample, rack, carrier, or card is being inserted and positioned according to the validated workflow.
Clinical Engineering should focus on whether the loading path, seating surfaces, and externally visible guides permit normal placement.
Do not force an item into position.
Expected outcome: The item seats normally and reaches its intended detection position.
5. Inspect the Loading Area
Inspect accessible loading areas for:
- Debris
- Spilled material
- Broken plastic
- Labels or adhesive interfering with movement
- Misaligned external guides
- An object preventing complete insertion
Use only approved cleaning methods and do not reach into moving mechanisms.
Expected outcome: The loading area is clean, unobstructed, and allows normal movement.
6. Compare With a Known-Good Item
When permitted by laboratory workflow, test a known-good rack, carrier, or equivalent loading item.
Observe whether the problem follows the original item or remains with the analyzer position.
Expected outcome: The comparison distinguishes an accessory problem from an analyzer-side detection problem.
If the known-good item is detected normally and the original item is confirmed defective or incompatible, the issue is resolved.
7. Check Whether the Problem Is Position-Specific
If multiple loading positions are available, determine whether detection failure occurs only at one location or across the entire system.
Do not continue repeated testing at a position that behaves inconsistently.
Expected outcome: The problem is identified as isolated to one position or affecting the system more broadly.
8. Verify System Status and Configuration
Confirm the analyzer is fully initialized and in the correct operational state for loading.
Verify that no operator-accessible workflow setting, pending action, or system state is preventing recognition.
Do not make unauthorized configuration or service-menu changes.
Expected outcome: The analyzer is in the correct state to detect the loaded item.
9. Perform Final Functional Verification
After correction, verify repeated normal detection using appropriate known-good materials without forcing or manipulating the loading mechanism.
Confirm normal identification and processing handoff before returning the affected function to use.
Expected outcome: Samples, racks, carriers, or equivalent items are detected consistently in normal operation.
If the Problem Persists
If external item condition, orientation, loading technique, obstructions, known-good substitutions, system status, and accessible configuration have been checked, common external causes have been ruled out.
The remaining problem may involve a detection sensor, mechanical transport condition, alignment issue, internal control problem, or service-level configuration issue.
The device should be:
- Removed from service if reliable sample identification or transport cannot be assured
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate manufacturer documentation and approved test equipment
- Repaired or configured only by qualified personnel
Do not adjust internal sensors, alignments, or mechanisms without authorized procedures. Knowing when to stop external troubleshooting is proper troubleshooting.
Complete appropriate operational and laboratory verification before return to service.
Clinical Use Tip
Treat inconsistent sample detection as a testing-integrity problem, not merely an inconvenience; prevent any possibility of the wrong specimen being associated with a test.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Laboratory staff reported that a carrier was repeatedly not detected when loaded into the bioMerieux VITEK 2 Compact."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found adhesive residue on the carrier preventing it from seating fully in the loading position."
Resolution
What action was taken.
Example:
"Removed the affected carrier from use, verified proper seating with a known-good carrier, confirmed consistent detection, and returned the analyzer for laboratory verification."
Helpful Details to Include (If Known)
- Item not detected
- Whether one or multiple items were affected
- Loading position involved
- Item orientation
- Physical condition of rack or carrier
- Presence of debris or adhesive
- Known-good comparison result
- Whether the problem followed the accessory
- System status at time of failure
- Exact displayed message
- Final detection result
Final Thought
Protect specimen identification first, inspect the external item and loading path, compare with known-good components, and escalate rather than disturbing internal detection hardware. Document the complete troubleshooting path clearly.
That is successful troubleshooting.