its Been in empty house for a month or two.Now lights on both heat and hot water but trips out .Spark continues while burner lit until trip out after approx. 5 to 10 seconds. .
maybe, I think its a board problem.Probably been damp lying there unused for a while.I was wondering if it could be the condensation sensor but im sure if it was the boiler wouldn't fire at all
That's quite common when you have no ionisation.
Of course if you're thinking of going into the burner combustion chamber you'll need to be a Gas Safe RGI & have a set of replacement seals.
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