hi again,
i have now read your advice......i have now switched on "hot water"
only...and the pump fires up.....i then switched off hot water...and just
switched on central heating.....again the pump fired up.....so i am now
guessing that both switches work independantly of each other...so it is safe
to just switch on central heating on its own without having to switch on hot
water also...would that be right?....many thanks yet again in advance