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Ta, yep done stage 1 today. Got the cosy disconnected and running off the fp720 and old room thermostat. Just had to connect the wire going off to the cosy into htgon, and remove the wire coming back from cosy. So wiser now should just be straight wire swaps. For now will probably just leave...

Hi, sorry for piggybacking on this thread but stem seems a good person, if around, to ask my question. Currently using a fp720 programmer with a geo cosy smart thermostat. Need to replace the cosy as being disbanded. Just wondering as the fp720 has internal live links to terminals 1 and 2 why...