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the hot water goes off when i put the cold water on ?

when i put the hot water on the boiler fires up same with the shower upstaires but when you turn the cold water onthe boiler stops until you turn the cold water tap off then it fires up again can you help
andy h, May 2010
plumbing problem by the sounds of it. either not enough water pressure / flow from the mains or restricted or incorrectly laid out pipework

Ian, May 2010