Boiler fault

Anonymous's Avatar (by Gravatar) by Anonymous in  Climate Control » Heating 

My biasi m90 24s boiler senses domestic hot water pressure drop and the flow valve light illuminates immediately. But there is about 4 or 5 second delay befor the gas ignites. Gas and water pressure and flow are very good, but the delay hasgotten worse over the last 12 months.
Any help would be great..

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