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Thank you for your reply's, I have since checked the fuse to the system and found it blown have replaced 3amp fuse and all now lights up, but have not tested all the functions but boiler heating and water seems to come on and work, is it possible that the wire is not used, and same as you say...

Danfoss FP715Si programmer, have been doing some tiling and eased programmer away from wall to slip tiles at the back, and a blue wire has come out and I dont know where from, there is the main blue wire from mains but this is a slightly thinner wire there is only one position it seems it can go...