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Thanks, Kevplumb. Is the air pressure switch an expensive thing to change? Also, is the pipe cleaning something I could do myself, or at least check them to find out if they need cleaning? I have no idea about pumbing, as you may of guessed! I really apreciate your help with this, thanks.

Hi, I have a 'traditional', not combi GlowWorm boiler (not sure of model number, sorry) and have a strange problem with the ignition of it. When switched on from cold (or via the Honeywell timer) the boiler comes to life (fan starts, etc) but no 'ticking' is heard trying to ignite. I can...