hello, i have a potterton kingfisher mf floor standing boiler with the tank in the loft, i have replaced the tank, the heating is working perfect, but there is no hot water at all from the taps.
Is the Boiler firing up ok? What about your Motorised Valve if you have a 3-port fitted or maybe you have 2 x 2-port Valves, have you checked them yet to see whether thay are opening or not, maybe it's stuck in the closed position?. See if you can open it with the small lever on the Actautor head or not.