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Yep - 240v at Terminal 1 on boiler chocolate block (switched live lead) which in turn comes from the orange lead from the HW Zone Valve.

My system - Halstead Best db40, fully pumped, CH - Zone valve & room stat,HW - Zone Valve & cyl stat, Siemens RWB9 Programmer. Problem - recently I started to hear a clicking or arcing noise from around the on/off switch area within the boiler when the programmer created a demand for hot water...