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Brilliant - Found the bleed valve (as per the picture !!) unscrewed it and out came a load of air !! Screwed it back up, fired up the boiler up and bingo - stays fired. Thanks very much for the advice, really appreciated, Cheers, Paul.

Thanks for that.... The pump is running - I ran the pump for a few minutes last night without the boiler being on... it sounded like there was water sloshing about all round the pipes, which I guess implies there's air in there as well. I'll have a hunt around for the manual vents tonight -...

Hi there, We've just replaced a radiator on the Central Heating, which involved draining down the system - the problem is that now when the thermostat calls for heat the boiler fires up for a few minutes then reverts back to the pilot. This will stay in that state for a while (hrs) until...