Hi i have a Vokera, mynute 20e. a while ago pump was leaking. turned off water and left system off. 3 months later back in house switched on boiler all ok. 1 month later pressure dropping to 0psi after 2 days. have just looked at pump and it is hard to turn and very hot i beleive it may be seized. also no hot water coming through taps do u think the pump faulty and do i also have another problem, could not find leak from pump 2nd time round.