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combi boiler ariston?

have to hit top of boiler for it to start or take the clear tube off of the switch and blow then it fires up now the heating starts then shuts down i 20 mins can u help me
dave, December 2009
slow fan / faulty air pressure switch / blocked venturi / blocked flue. get a qualified engineer to diagnose the fault, it'll be cheaper in the long run.

Ian, December 2009