Also called: FBC machine maintenance, Hematology analyzer errors, Background count

Haematology Analyser Maintenance and Troubleshooting

The routine that keeps an FBC machine counting accurately — and a calm, step-by-step approach when it shows an error or a strange result.

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Last updated: 8 October 2026

The maintenance schedule

Exact tasks and intervals differ between models, and the instructions for use (IFU) are always the authority. This is the typical shape of the routine on a clinic analyser.

When	Task	Why
Every morning	Start-up, then background (blank) check	Confirms the fluid path and reagents are clean before controls
Before patients	Run controls and record them	Shows the analyser is accurate today
End of day	Shutdown with cleaning cycle	Removes protein from the aperture and tubing
Weekly or monthly, per the IFU	Probe wipe, enzymatic or hypochlorite cleaning, filter and waste-line checks	Prevents clogs and carry-over build-up
When a reagent is changed	Prime the new reagent, record its lot, rerun controls	Removes air from the lines and catches lot shifts
At the maker’s interval	Engineer preventive maintenance and calibration check	Replaces worn tubing, valves and seals before they fail

Background count: the first check of the day

The background or blank count runs diluent alone through the system. Counts above the manufacturer’s limit mean something in the fluid path is contaminated — a dirty aperture, a contaminated reagent, growth in a diluent container, or bubbles. Do not run controls or patients until the background passes.

Repeat the background once; a single high result can be a bubble.
If it stays high, run the cleaning or soak procedure in the manual.
Check that the diluent is within its opened stability and has not been contaminated; replace it if in doubt.
Note which parameter is high — WBC, RBC or PLT — because the manual often links each to a specific part of the system.

Common errors and what they usually mean

Error or symptom	Usual causes	First steps
Clog or aperture blocked	A micro-clot or fibrin from a sample, protein build-up, or dried reagent crystals	Run the unclog and cleaning routine, check the last sample for clots, call service if it keeps returning
Bubble or aspiration error	Air in reagent lines, an empty or loose reagent container, a short sample	Check reagent levels and connections, prime the reagent, check the sample volume
High background	Contaminated diluent, dirty fluid path, bubbles	Repeat, clean, and replace the reagent if in doubt
Reagent expired or empty	Pack past its printed or opened expiry	Replace, prime, record the lot and rerun controls
Temperature warning	Room too hot or cold; analyser in sunlight or under an air-conditioner outlet	Bring the room within the stated operating range and let the analyser settle
Waste full or blocked	Full waste container or a kinked waste tube	Empty it under your clinical-waste procedure and check the line
Printer or communication error	Cable, network or interface settings	Check connections and settings; results remain stored on the analyser

QC shifts and trends

Sudden shift

Controls jump together from one day to the next — usually a new reagent or control lot, a partial clog or a calibration problem. Check what changed first.

Gradual trend

Results drift one way over several days — often protein build-up, ageing reagent or control material, or a wearing pump. Cleaning often fixes it; recalibration may be needed.

One parameter only

Only HGB, only PLT or only WBC is out — this points to the part of the system that measures it, such as the haemoglobin measuring cell or the counting aperture.

When to call the service engineer

Clog or background errors that return after the full cleaning routine.
Controls that still fail with fresh reagent, fresh controls and a clean system.
Leaks, unusual noises, or fluid where it should not be.
Mechanical errors from the sampler, valves or syringes.
Any repair that needs the covers off — leave internal work to trained engineers, then recalibrate if required and run controls before patients.
Keep a maintenance log of the date, error, action taken, who did it and the control results afterwards. It shortens every service call and is expected for accreditation.

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Frequently asked questions

How often should a haematology analyser be cleaned?

Most analysers run a cleaning cycle at every shutdown, with deeper enzymatic or hypochlorite cleaning weekly or monthly as the manual specifies. Follow the IFU for your model.

What causes a clog error on an FBC machine?

Usually a micro-clot or fibrin strand from a poorly mixed or clotted sample, or protein build-up when cleaning is skipped. Run the unclog routine and check the last sample that went through.

Can I use household bleach to clean the analyser?

Only if the manufacturer specifies hypochlorite, at the exact concentration it states. The wrong cleaner can damage tubing and seals and may affect the warranty.

Should an FBC machine be left on overnight?

Follow the maker’s advice. Some analysers are designed for standby and others for full shutdown, and the choice affects reagent use and cost per test.

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