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ChrisOxford, many thanks for the response. I finally got round to buying and fixing the thermostat last week and your advice was spot on and I now have a wonderful working thermostat.

Hi all, hoping someone can point me in the right direction with what wires do what on my thermostat. I am looking to replace a potterton PTR01.000 which is wired up as so with a Heatmiser PRT-WTS kit which has a wiring diagram as so: I think the existing Red wire in...