Hello rcaro,
welcome to the show.
Please excuse for answering late, i've got a new hobby, a 30 year old Cycle BMW R100RT, so i'm on the sunny road.
To fix your problem, open the Machine, you'll find a guide here:
http://www.saeco-support-forum.de/faq/traebbe/Primea/Primea.pdf
At Page 12 and 13...