Hi, I have a 3bd house, there are 4 radiators upstairs and 4 downstairs. The boiler is a Worchester (I'll update with model later) and the system was disconnected with the house in renovation for over a year. A heating engineer came out and commissioned the system, signed it off and left idle for a few months. I've finally gotten back home, found the water pressure was at zero. Refilled the system, bled each radiator at the bleed points and fired up the boiler after replacing the batteries to the thermostat (it reported low battery). The upstairs radiators get hot enough you don't want to touch them, downstairs is stone cold. the supply lines to downstairs get hot but the radiators do not. So I've checked all the valves both ends, they all function then bled/flushed all the lines where points are available to do so. I can pull hot water through via draining but it won't keep hot water circulating into them. The pump is set to 3 and feels like it is operating. I tried closing all the valves to upstairs and downstairs then open the valves on each radiator downstairs. 2 radiators are hot, 3 warm, 4th open then luke warm. I did try closing in the 4th and opening a radiator upstairs, the upstairs one was roasting hot and the downstairs 3 open barely held warmth. Any ideas please? This is driving me nuts.