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Hi to all, Many thanks to you all for you valid assistance. It was a blocked venturi after all. Replaced rather than clean - cost £18.00. Also needed a flue clamp. Old one rusted and broken. Tested for a gas-tight seal - OK. Cleaned burner assembly whilst I was in there. Boiler like new...

OK. Thanks for that - I'll have another look tomorrow and assess the job as this is obviously now a combustion space strip down. From your description I need to get parts in as during the strip there will be items that cannot be replaced once removed, like the spire clips. :? I really...

Hi Cowley, OK - how do I clean the venturi then please? Where is it situated? Thanks.

Hi Cowley, Blew both tubes through and inspected flue. Have already checked seal and replaced all four captive clips for the screws as the old ones were rusty. Still no joy. Anyone else got any ideas/pointers please?

Dear all, Still struggling on this one. Still feel that it is more a controls issue than combustion-might be wrong. Wondering if the brand new air pressure switch is at fault? Is there a way of by passing this momentarily to see if I still loose flame? Rather not call out the Corgi boys at...

Hi Chris, What does the flow switch/diverter valve look like? Thanks for answering.

Hi all, New to this forum stuff - be gentle. My 240P boiler has just started playing up. When calling for hot water or central heating the boiler fires, makes the air pressure switch - runs for about 5-7 seconds, looses flame and goes back into a purge (orange neon comes on). Changed the...