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& @stem - yes that was the plan (just swapping programmer for Nest) it was the thermostat wires to use for 12v that started me into the wiring centre. appreciate tip though - one thought now is turn it all off, take thermostat apart and connect tone generator and then return to wire centre to...

Evening, thanks, appreciate tips so far, this is existing working system prior to Nest install, issue is six cables come through the wall and difficult to trace - four cables come sideways into wiring centre, from these I have been able to tell that - Incoming Live is 1 Incoming neutral is 2...

Hello All, I'm fairly competent electrical wise, however having read up on DIY installing Nest into a S Plan system - now faced with the practical question of how to identify the connection to heating thermostat - see below picture IMG_1097 by Magnusemail posted 5 Mar 2017 at 5:51 PM Any tips...

Wiring Centre - trying to work out how to tell which is heating thermostat