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Goodtruth, I have only just managed to get this working however this has been many a try that’s failed. I’m hoping this is the solution. You need to leave the original TR2 connected and use the new switch in conjunction with a resistor in parallel to fool the Boiler target temp. When I’ve got...

Thanks Picasso, I'll try this and let you know. Cheers

Hi All, I'm aware this is an old post but there might be some survivors out there. ... I have the same problem on this TR2 thermostat controller. I am trying to install a hive heating thermostat. I have completed the wiring diagram as above making sure that the resistor switches from 12.2...