Fresenius 4008B
Fresenius · Model 4008B
Through continuous optimization of the treatment modalities Fresenius Medical Care always aims to offer patients the best renal replacement therapy to Our hemodialysis system 4008S guarantees safety and efficiency of all important treatment modalities within the scope of renal replacement therapies, such as Bicarbonate or acetate dialysis, Single-Needle or single-needle click-clack, Ultrafiltration and sodium profiles, Isolated ultrafiltration / Bergström treatment, Online-Hemo(dia)filtration. The hemodialysis equipment can be adapted by the modular combination of extensive options to special therapy modalities. The automated acquisition, monitoring and control of specific patient and machine parameters provide the operator with continuous and precise assessment of the current treatment situation. The 4008S machine is available with 5 functional slots for slide-in modules
Key tips
- ·Conductivity and water-quality checks are non-negotiable before every shift - dialysate chemistry errors are a direct patient-harm mechanism.
- ·Confirm disinfection cycle completion, never assume it, after every use.
- ·Treat a blood-leak detector fault as real until proven otherwise - never silence and continue.
Typical Failure Modes
Failure patterns typical of this equipment class - general BMET reference, not verified against this exact unit's own service history unless flagged. Severity is a category-level estimate.
Blood leak detector false/real
HighSymptoms: Blood leak alarm, treatment stop.
Root cause: Optical cell dirty or true leak.
Conductivity / dialysate fault
HighSymptoms: Conductivity out of range, dialysate alarm.
Root cause: Mixing valve or sensor fault.
Ultrafiltration error
MediumSymptoms: UF inaccuracy, weight alarm.
Root cause: Balance system / scale fault.
Heparin pump fault
LowSymptoms: No infusion, air alarm.
Root cause: Occlusion or drive failure.
Serviceable Parts & Consumables
The parts a BMET typically services on this class of equipment. Service class and relative cost are general engineering estimates for the category, not figures from this unit's documentation. Part numbers appear only when pulled from this unit's own service manual. Always confirm intervals and pricing against the manufacturer.
Dialyzer (filter)
Single-use.
Class ConsumableRel. cost $$R&R Easy
Conductivity cell / sensor
Class Periodic replacementRel. cost $$R&R Moderate
Blood pump roller
Class Periodic replacementRel. cost $$R&R Fairly easy
Heparin pump syringe drive
Class Periodic replacementRel. cost $$R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Dialyzer (filter) Single-use. | Consumable | $$ | Easy |
| Conductivity cell / sensor | Periodic replacement | $$ | Moderate |
| Blood pump roller | Periodic replacement | $$ | Fairly easy |
| Heparin pump syringe drive | Periodic replacement | $$ | Moderate |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Disinfection cycle verification
- ·Conductivity and water-quality check
- ·Blood-leak detector test
- ·Scheduled tubing / filter replacement
- ·Annual full PM
Error Codes
Extracted directly from this unit's own service manual.
F01 HPUPresent options and DIP switch settings do not match. CPU1 system status (MST), HPU status and DIP switch/Array2 changed during the test running time. – ONLINE plus: CPU 2: Array 2, DipSw2 not set to OFF CPU 2: Array 2, DipSw3 not set to ON – DIASAFE plus: CPU 2: Array 2, DipSw2 not set to OFF CPU 2: Array 2, DipSw3 not set to OFF – MST transmitted by CPU1 not matching with the set DIP switch of array 2. – DIP switch/Array2 changed while the test was in progress. – HPU logged off. F34 ONLINE plus F34 DIASAFE plus Pressure holding test not passed. Max. number of treatments exceed- ed? –
F02 HPUDialysate outlet pressure (DA1) outside the permissible range (10s). DA1 test range: –125mmHg ≤ P_dial ≤ 55 mmHg – Acknowledgement DA 1 (P_DIAL, X633L/B6) → X632/A29 – Acknowledgement line DA 2 (see HPU diagram) F03 ONLINE plus F03 DIASAFE plus
F03 HPUCross comparison of both pressure transducers (DA1 / DA2) is outside the acceptable tolerance (10s). P(DA2) == P(DA1) ±20mmHg – Acknowledgement DA 1 (P_DIAL, X633L/B6) → X632/A29 – Acknowledgement DA 2 (see HPU diagram) F41 ONLINE plus F41 DIASAFE plus
F41 HPUThe test valve V183 is leaking. Pressure increase in the system of ΔP(DA2) > 30 mmHg within 4s. – V183 open, contaminated, or mechanically defective – HPU, output stage etc. defective F42 ONLINE plus F42 DIASAFE plus
F42 HPUNo pressure increase of ΔP(DA2) > 200 mmHg within 4s after opening the test valve V183 in the system. – V183 fails to open or mechanically defective. – Air pump defective, is not running – HPU, V183 and/or air pump output stage etc. defective Fresenius Medical Care 4008 5/03.09 (TM) 1-49 F43 ONLINE plus F43 DIASAFE plus
F43 HPUThe lower pressure test range of ΔP(DA2) > 300 mmHg failed to be achieved within 1s after closing the test valve V183. – HPU, output stage etc. defective – ONLINE filter leaking F44 ONLINE plus F44 DIASAFE plus
F44 HPUThe upper pressure test range of ΔP(DA2) 750 mmHg was exceeded within 4s after closing of the test valve V183. – HPU, output stage etc. defective F04 ONLINE plus F04 DIASAFE plus The air pump is running although valve V43 is closed. – HPU, output stage etc. defective F05 ONLINE plus The door on the Online Sys module is open during the rate test. – Close module door. F06 ONLINE plus Port 1 is open during the first pressure build-up phase. – Close port 1 (substituate port). F07 ONLINE plus Port 2 is open during the first pressure build-up phase. – Close port 2 (rinse port). F08 ONLINE p
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Blood leak detector false/real
- Confirm the presentation - typically blood leak alarm, treatment stop - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: optical cell dirty or true leak.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the blood tubing set / roller segment per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Symptom: Conductivity / dialysate fault
- Confirm the presentation - typically conductivity out of range, dialysate alarm - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: mixing valve or sensor fault.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the dialyzer (filter) per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Dialysis unit / clinic
- ICU (acute dialysis)
- Home hemodialysis
Documents & Manuals
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