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Hi looking into this further, there is only a live and neutral on the thermostat with a resistor.

Hi, thanks for your reply. I did see that post but I wasn’t too sure what to do within my own thermostat. Linking out L and SL makes perfect sense. Thanks again. David

Hello, I’ve just moved house and found myself with a Ideal Mexico Super ideal C125 boiler, Horstmann 425 control and Sunvic thermostat. I’d like to replace the control for a hive but need some assistance with the wiring please. I’ve attached a couple of pictures. Thanks in advance! David

Horstmann 425 tiara

Thermostat Sunvic