Like the video, whilst we both have Greenstar Boilers, I think mine is a bit older than yours! The only controls I have are the two knobs on the front, left is power right is the flow temperature.
AFAIK the only controls inputs are are 240V call for heat (the output switched lines of the two zone valve switches are connected in parallel and then into this connector). The boiler than has a switched output to the pump.
What I want to do is control of the knob on the right, this is a Pot connected to the circuit board, but I
I don’t want to open the boiler, even to remove the knob, as I am pretty sure that’s classified as messing with the boiler. So I am considering a servo/arduino type solution to physically turn it
Boiler is a 2010 model, installed in 2011 was reconditioned recently It also has a scarily high standby power of ~10W I am assuming due to a transformer power supply to the circuit board,the blue light and eddy current losses. My plan is to hold out a few more years until a heat pump becomes an option. Northern Scotland is not a hotbed of heat pump installers, at the moment I worry if I went with someone in e.g. Glasgow how it would be serviced / maintained if it broke!