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ok thanks @picasso, right new actuator has arrived, just fitted it and it works! Thanks for your help, now just need to tidy the wiring up and remove the old timer.

Sure, here you go @picasso I've been checking over the weekend, the lever on the valve had been set to manual, whilst like this, the H/W will come on and also heat the radiators and if I turn the room thermostat up, it will turn the pump on and the boiler. But if I move the lever to auto, the...

Here you go @picasso I've done a complete wiring diagram. I agree @flameport I'm just not sure how to re-wire it. I do understand that if the timer was on some sort of schedule than that would throw a spanner in the works with the nest, so on the timer HW and CH are manually set to ON I would...

Hi all, I've recently purchased a Nest v3 thermostat and had a go at installing it.... It works!....but I have a smallish problem I'm hoping you guys can help with. Ok, so when I choose to either boost the hot water, or the hot water thermostat kicks in, the boiler fires up, the pump comes on...