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    Combi-Boiler keep attempting to fire up?

    I have a Sime Super 105 MK.II combi natural gas boiler and recently I have noticed that when it is on - whether the central heating system or hot water, it first tries to fire up with fan going on and off about 5 or 6 times before I see a light (and get hot water/ central heating) - this sound a...
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