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Hi Stem, Thank you so much for your reply. You are totally right, I was trying to be kind to the boiler, it was made in 91 so definitely over 30 years old. I've also been in touch with Heatmiser and they have been helpful as well. They've given the go ahead for this wiring diagram and if you...

Hi Everyone, Long time lurker, first time poster. I'm trying to upgrade the heating controls for my mother's boiler, it's probably 30 years old and needs upgrading itself but that is a later task. At the moment I'm upgrading it from a timed hot water and heating, to thermostatically...