Fresenius Medical Care 4008 E Technical Manual page 67

Hydraulics test (check of V91 and valve 98)
in machines without central delivery system
Error message
F14
V91 Failure
F14
1-60
Fresenius Medical Care 4008 4/08.03 (TM)
Description
Three minutes before the end of the mandatory rinse in Dis I to V.
It was not possible to readjust the flow to 750 ml/min ±50 ml/min. V91
defective.
Three minutes before the end of the mandatory rinse in Dis I to V.
After V91 has opened, a flow > 950 ml/min failed to develop. V91 or
valve V98 defective.
Shortly before the end of the mandatory rinse in Dis I to V.
The hydraulics test has not been completed correctly, possibly caused
by flow problems.