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what causes my oil fired central heating system to backfire?

my heating has started to backfire, filling the house with fumes can anyone tell me why
keen to learn Alan, April 2010
needs a service right away, flue choked or exhaust chambers blocked probably due to wrong oil/air mix get this fixed by a pro.

avs, April 2010
hard to tell as you don't mention boiler make / model.
stop using the system right away and call out a service engineer.

Ian, April 2010