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Halstead Ace High fires up without call?

I have a halstead ace high the heating keeps coming on even though I have not called for it and the water is imeadiately hot when I turn the tap on any ideas please
Tim Davies, September 2011
boiler may be in preheat mode or hot water flow switch stuck to closed possition

k, September 2011
link Click here to see other fixes for Halstead Ace High.