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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
Heating, Home Heating SystemsOil Fired Central
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

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