Fresenius Medical Care 4008 E Technical Manual page 40

Error description:
Error message
F01 neg. Pressure
F02 neg. Pressure
F03 neg. Pressure
F04 neg. Pressure
F05 neg. Pressure
F06 neg. Pressure
F07 neg. Pressure
F95 neg. Pressure
In machines with HDF option, the negative pressure holding test is performed internally only; i.e.
V24, V24B are closed and V26 is open.
Description
During the start phase a negative pressure of more than 450 mmHg
has developed (max. test running time 120 sec),
– the hydraulic system is contaminated,
– the air separation pump started running.
Setting the dialysate pressure to the test pressure (–300 mmHg to
–450 mmHg) was not possible (max. test running time 120 sec).
Upon repetition of measurement, the range was extended from
–260 mmHg to 490 mmHg.
– Leakage in the hydraulic system.
– The UF pump is defective.
– If the HDF filter test was skipped: Clamp the HDF filter.
The working point (116 digits) of the differential amplifier cannot be set
correctly (max. test running time 120 sec).
– Pressure variations are too large.
– The D-A converter (IC11) on P.C.B. LP 632 is defective.
– The operational amplifier (IC1/IC3) on P.C.B. LP 632 is defective.
– The acknowledgement (P_DIAL, X633L/B6) → X632/A29 is defec-
tive.
– The CI signal is missing (LP 632 → X632/B22).
Completion of pressure measurement was not possible (max. test
running time 120 sec).
– The D-A converter (IC11) on P.C.B. LP 632 is defective.
– The operational amplifier (IC1/IC3) on P.C.B. LP 632 is defective.
– The acknowledgement (P_DIAL, X633L/B6) → X632/A29 is defet-
ive.
The air separation pump started running during the measurement
phase.
– Acknowledgement (ACKN_ASP, X634L/B10) → X632/A19, 0 V are
missing.
– ASP has been interrupted electrically.
The negative pressure holding test failed to be passed. The dialysate
pressure drop exceeds ±40 mmHg (related to ten balancing chamber
switching).
– Leakage in the hydraulic system.
Current increasing pulses were not recognized (min. 2x).
– 5-V balancing chamber pulses are missing (CI. X634R/A23) →
X632/B22.
System error.
Fresenius Medical Care 4008 4/08.03 (TM)
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