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What This Guide Helps With
Troubleshooting UF-1000i sample aspiration errors, probe clog warnings, low sample flow, or specimen pickup issues before repair escalation.
Step-by-Step Troubleshooting
Ensure Patient Safety First
Confirm the UF-1000i is not actively processing patient specimens before opening covers, handling racks, checking sample areas, or initiating cleaning.
Expected outcome: No patient specimen is interrupted, lost, or reported from a device with an unresolved aspiration issue.
Stop Additional Sample Processing
Ask laboratory staff not to load additional racks or specimens until the aspiration or clog issue is evaluated.
Confirm whether any specimens were in process when the error occurred and whether results were completed, flagged, rejected, or require repeat testing per laboratory policy.
Expected outcome: Incomplete or questionable urine results are not released.
Confirm the Exact Complaint
Ask staff what they observed. Determine whether the issue involves:
- Sample aspiration error
- Probe clog message
- Low sample volume
- Missed specimen pickup
- Air bubbles in the sample path
- Repeated failed samples
- Abnormal scattergram or count results following aspiration
- Probe not descending or returning properly
Expected outcome: The failure is narrowed to sample pickup, probe movement, specimen condition, or fluid path behavior.
Check the Specimen Cup and Sample Volume
Verify the urine specimen cup is properly filled, correctly positioned, and not underfilled.
Check for foam, heavy sediment, mucus, clots, crystals, or debris that may interfere with aspiration.
Expected outcome: A low-volume or obstructed specimen is identified before assuming analyzer failure.
If replacing or remixed specimen handling resolves the issue, stop troubleshooting and document the finding.
Verify Rack and Tube/Cup Positioning
Confirm the rack is the correct type, seated properly, and not damaged.
Check that specimen containers are sitting fully in the rack and are not tilted, cracked, overfilled, or placed in the wrong position.
Expected outcome: The probe can align with the specimen container without obstruction or mispositioning.
Inspect the Sample Probe Area Externally
With the device safely paused and access permitted, visually inspect the sample probe area for visible dried urine, crystals, residue, or obstruction.
Do not bend, force, scrape, or manually realign the probe.
Expected outcome: Any obvious external buildup or obstruction is identified without damaging the probe.
Check for Visible Probe Damage
Look for obvious signs of a bent, loose, cracked, or contaminated probe.
If the probe appears bent or physically damaged, remove the analyzer from service and escalate to repair.
Expected outcome: Physical probe damage is recognized as a repair issue, not a cleaning issue.
Run the User-Accessible Cleaning or Rinse Function
If available to Clinical Engineering and permitted by facility procedure, run the analyzer’s normal rinse, cleaning, or probe maintenance cycle.
Use only approved cleaning solutions and laboratory-approved maintenance materials.
Expected outcome: Minor residue, urine crystals, or partial blockage may clear through normal maintenance.
If aspiration returns to normal after cleaning, stop troubleshooting and document the cleaning action and successful test.
Check Reagent, Sheath, Diluent, and Waste Conditions
Verify required fluids are present, connected, not expired where applicable, and not empty.
Confirm waste containers are not full and that waste tubing is not kinked, pinched, or disconnected.
Expected outcome: Aspiration errors are not being caused by downstream fluid handling or pressure problems.
Inspect External Tubing and Fluid Path Connections
Check visible, user-accessible tubing for kinks, air gaps, loose fittings, leaks, crystallized residue, or pinch points.
Do not disconnect internal tubing unless authorized by service procedure and local policy.
Expected outcome: External fluid restrictions or leaks are ruled out.
Listen for Abnormal Pump or Aspiration Sounds
During a safe test or maintenance cycle, listen for unusual clicking, grinding, repeated priming, weak suction, or pump strain.
Expected outcome: Abnormal pump behavior may indicate an internal fluidics or drive issue requiring bench evaluation.
Check Error Timing
Determine when the error occurs:
- Before probe descent
- During specimen pickup
- During rinse or wash
- After aspiration
- Only on certain racks or specimens
- On every sample
Expected outcome: Repeated failure on all samples suggests an analyzer issue, while failure on certain specimens may point to container, volume, or sample condition.
Try a Known Good Control or Approved Test Specimen
Have laboratory staff run an approved control, maintenance sample, or known acceptable specimen according to laboratory policy.
Do not use patient testing as a trial if the analyzer’s reliability is questionable.
Expected outcome: A known good sample helps separate analyzer aspiration failure from poor specimen quality.
Check for Related QC or Scattergram Abnormalities
Ask staff whether QC failed, scattergrams looked abnormal, counts were unexpectedly low, or samples required frequent repeat testing before the clog error appeared.
Expected outcome: Trending quality issues may confirm a developing fluidic restriction rather than a single specimen problem.
Restart Only When Safe and Appropriate
If the analyzer is idle and results are protected, perform a normal software shutdown and restart if local procedure allows.
Do not power cycle during active sample processing.
Expected outcome: A temporary software or sensor state may clear, but repeated aspiration errors still require further evaluation.
Verify Operation After Corrective Action
After any cleaning, fluid correction, rack correction, or restart, have laboratory staff run QC or an approved verification process before returning the UF-1000i to patient testing.
Expected outcome: The analyzer is not returned to service until acceptable operation is confirmed.
If the Problem Persists
If the UF-1000i continues to show sample aspiration errors, probe clog messages, weak suction, repeated failed samples, abnormal fluid movement, or questionable results after external checks and approved cleaning, common external causes have been ruled out.
The analyzer should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
Possible internal causes may include a clogged sample probe, internal tubing restriction, pump failure, valve issue, sensor problem, pressure/vacuum fault, or internal fluidics contamination.
Knowing when to stop is proper troubleshooting. Continued operation may risk delayed testing or unreliable urine particle results.
Clinical Use Tip
Do not troubleshoot aspiration or probe clog issues while patient specimens are actively being processed. If urine testing must continue, move testing to another validated analyzer or follow the laboratory’s approved downtime process first.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Laboratory reported the Sysmex UF-1000i displayed sample aspiration errors and failed to process several urine specimens."
Cause
What was observed during troubleshooting.
Example:
"Inspection found adequate reagent levels but visible residue near the sample probe area and repeated aspiration failure during verification."
Resolution
What action was taken.
Example:
"Ran approved probe cleaning/rinse cycle, verified rack and sample cup positioning, had lab perform QC verification, and returned analyzer to service after successful operation."
Helpful Details to Include (If Known)
- Error message or code displayed
- Whether the issue affected one specimen or all specimens
- Sample volume and specimen condition
- Rack type and rack position involved
- Probe condition observed externally
- Reagent, sheath, diluent, and waste status
- Tubing checked for kinks or leaks
- Cleaning or rinse cycle performed
- QC or verification result after troubleshooting
- Any abnormal pump sounds
- Presence of air bubbles, leaks, residue, unusual odor, heat, or fluid buildup
- Final device status
Final Thought
Sample aspiration and probe clog issues should be approached logically and safely. Rule out specimen condition, rack positioning, fluid levels, waste status, visible obstruction, and approved cleaning before assuming internal failure. If the analyzer cannot reliably aspirate known good specimens, remove it from service and escalate. Clear CCR documentation helps protect patient results and supports efficient repair.
That is successful troubleshooting.