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The product did come with a manual, however your comments aren't exactly helpful. My error was made through connecting the natural link when only live and switched live connections are required. I believe this is the case for a lot our boilers. A light switch uses live and common for the same...

I've made the connections and now set the boiler control to On and run the whole systems via the room control. Boiler is already has a reduced workload. Many thanks!!

I've been trying to connect my Greenstar 24i boiler to a CM61 room thermostat as the boiler makes the house very hot. What seems like a simple wiring diagram has resulted in several blown fuses so far. Listings are boiler first. --> Ns to B --> Ls to A Blown fuse --> Ns to A -->...