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The existing timer is simply connected to a Worcester Bosch 24i boiler (about 8 yrs old). The cable I am talking about is connected to the boiler. Ideally I'd like to control heating and water with the new timer as the old one only controls heating. Sorry for my ignorance on this but...

I have bought a Lifestyle LP241SI to replace a Lifestyle LP111. Trouble is there are only 5 wires coming out of the boiler - 2 black wires, 1 brown, 1 yellow/green (going to earth) and one blue. I have left the wires connected to the back plate so can see the brown and blue with going to N and...