A friend of mine has a 5 yr old Pavoni domus bar, light use over that period, but not used for the past year. When last used it worked fine but when they went to use it recently after this break they have found that the pressure didn't build up.

From what i can find it sounds like maybe it needs descaling, or maybe the rotary thing in the motor has seized, or an airblock? I don't have the machine to play with (yet) as they are out of town, but thought i'd get a head start with what might be worth looking at. We don't have particularly hard water where i am.