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unexpected startup

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    Grant Vortex Boiler Fires up when cold water switched on

    Hi, I have recently had a Grant Vortex Blue 36KW boiler internal fitted and it seems to work OK but I have noticed that when the cold water is switched on, say in the bathroom, the boiler starts up like it is heating up the internal hot water store. It doesn't do it every time, but after it has...
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