when you turn hot water tap on or central heating the burner ignites then cuts of this happens 5 or 6 times then ignites and hot water and the heating is then available.

christian townson, July 2008

Christian
Switch off your boiler. Remove front cover (1 screw on top of boiler, then slide upwards) remove 4 screws on inside cover and remove. You will see 2 clear plastic pipes inside. These lead to a 'Venturi' inside the flue. Remove flue from top of boiler and clean venturi. (Much easier if venturi removed first, dont mix up the pipes) Refit all.
Should solve your problem.
Fesk

fesk, July 2008