Hi , just added my last rad in house and i does not warm get hot like the others and now a few others dont get hot like they used to , i have bled all rads , i also shut all the hot rads down which did work .The rads got hot but when i opened the other rads back up the rads called down again , i have a vortex 26 condensing combi boiler .Any ideas anyone whats wrong . Thanks
