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All sorted - thanks

Thanks - so do I just pull the N from the block on the boiler and connect the L into 3 as constant and the switch live into 1 or 2 ?

Hello - my Drayton Combistat seems to run all the time so I have bought a Sunvic TLX7501 Thermostat - but I need help with the wiring ?? The boiler is a Potterton Combi 80, and the existing wiring for the Drayton is 3 wires - these are still connected to : L = Live 3 = Load N = N I presume...