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Hi jack, I connected it all up and it's working perfectly. Very happy. Thanks alot for your help. Best regards, Nick

Hi jack, thanks for your reply, here are the photos of the wiring, The wire going through the wall is connected to the thermostat, the other one is from the boiler. I saw some wiring diagrams showing that the programmer needed it's own direct power supply and others showing connection only...

Hi, i just bought a new Horstmann c17 programmer, which I tried to install but doesn't seem to be working correctly. My original set up was a combi boiler with a room thermostat connected by a Live/neutral flex (earth wasn't connected). the terminals on the c17 programmer are N L 1 2 3 4...