We had a pressure vessel (big red thing) fitted to our C/H system last month, its a Condensing Worcester Greenstar 24i (non combi) that has pumped H/W and C/H, We came to put the heating on the other night and none of the radiators work upstairs. I have turned off the downstairs ones and set the pump speed to 3 (max) and still no joy. The pump is definately spinning and the pressure guage is reading as per normal. I have also bled the upstairs radiators too. Obviousley the Plumber will come back, but in the mean time Im wondering if there is anything else I can do.