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Thanks for ths sppey replie Tony. i have found the problem. the heating return valve was in the off position!! i didnt turn it off, it must have been the guy that serviced it this spring?. anyhoo no leaks at all, so alls well :D .

Hi. just tried to fire up the central heating side of my combi, but no joy. :cry: it fires up and heats the water but it does not circulate. i have good sytem pressure, and light on for the pump and safety thermostat activated. (not flashing). does anyone think the pump might have seized, as...