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I owe apologies all round. I leapt straight to the example wiring diagrams and missed the comment elsewhere in the instructions: "The CentaurPlus has voltage free contacts. A link L-2 is required for mains voltage applications". Have inserted this link and all tickety-boo now. Sorry to have...

Many thanks. The reason I have not done this is because the installation leaflet which comes with the C17 gives two typical wiring layouts for combi boilers and both diagrams are labelled "Terminals L-2 should not be linked". Is my 3-wire set-up untypical?

I bought a C17 to replace my aged brown/cream digital Drayton Tempus Seven. The Drayton backplate has 7 teminals: E, N, L, 1, 2, 3, 4; and there are 3 wires connected to N, L, and 4. The C17 has an industry-standard backplate of 6 terminals: N, L, !, 2, 3, 4 and a separate earth terminal. The...