Bosh washing machine WFk 28?

Dear Sir ,
The yellow light in the front panel is on , indicating a problem.The water is not entering in the washing machine, I have removed the hose and checked whether the filter was blocked but it was not. I would like to know the name of the part that controls the entry of water in the washing machine.As I think this part is gone.
Any help would be really appreciated.
Thanks.
Marco