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As I have changed the boiler and the problem has persisted can I safely assume that it is a flue problem? The boiler does fire sometimes but not always.

Thanks Slugsababy, You are right, the installation manual states, "Maximum allowable flue length 2.5m. But directly below that statement it reads,"Maximum No 2x1000mm. flue duct extension used with standard flue." Standard flue is 1000mm with 2 extensions you have 3m. Confusing? In the block...

Flue is 3m with 90 elbow on the boiler, no other bends Peter

I came on this site for advice, not to be told how to use a computer by a sarcastic cretin Peter

Thanks c128, but this is the second boiler with the same problem Peter

[/b] IN AUGUST I HAD A RAVENHEAT CSI 85T INSTALLED. AT FIRST IT SEEMED TO WORK OK BUT OCCASIONALLY THE BOILER "FLAME OUT LIGHT" WOULD COME ON, INDICATING THAT THE BOILER HAD FAILED TO START. AS TIME WENT ON, THE "FLAME OUT " LIGHT WAS COMING ON MORE FREQUENTLY. THIS WAS IRRESPECTIVE OF WETHER...