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how can i fix my Ariston Aco boiler?

My Ariston Aco 32 condensor boiler backfires, when igniting,what is the problem ?
gary, November 2009
gas air mixture set up wrong or delay in spark ignition, you may have to replace the ignition pcb, have look in the MI at the fault fiding section

jason, November 2009
link Click here to see other fixes for Ariston.