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Hi, boiler starts up, fans on, gas valve opens, pilot on, main burner partly lights then immediately goes out and loops the cycle. This continues until the boiler fires successfully and its then OK, at least its OK for the next 5 seconds or 5 mins or 15 mins, then goes off and repeats, no...

Got a bit of a strange one, burner failed, upon test the problem was a lack of pilot light, pulled out the pilot, checked and all seem fine, cleanish, electrode ok sparking etc. Replaced and noticed that the flame is only on the side of the electrode and tiny, nowhere near enough to light...