having turned off my central heating , and using just hot water my system has stopped giving me hot water. I have a grundfos alpha which runs continually into the cistern, but does not give me hot water. the pump sounds noisy but i can get a couple of drips out of the baring when I remove the cover. I cannot get any pressure to bleed my upstairs radiators when I put the central heating on . ps the cental heating boiler and cistern is upstairs. help!!!. pps this is from an old geezer who can peen lead pipes and wipe a joint and now needs someone to wipe my bum (not literaly)

