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Ok Picasso, Stem - thank you for the steer, that's really helpful. These are located above the boiler and to the side of the spaghetti junction that is the wiring centre I posted the pic of above. I've ordered a larger wiring centre which will arrive in the next day or two. I take it that...

Ok, so here's the inside and underneath of the boiler... I've looked further down from the boiler but can't see any motorised valves?

Thanks Picasso. I'd noticed this morning that the upstairs radiators were on while the downstairs one's were not. There's a wiring box above the system that I'm mapping out just now, and I'll post that when I have them.

Hi Guys I have a Logic Combi ESP i35 boiler and plan to install my 3rd Generation Nest thermostat(s). I was told that the boiler was dual zone and has ESI thermostats in the bedroom and living room. I have two 3rd Gen Nest's and two Heat Links that I want to use to replace them. I have a...

Thanks very much Jackthom. I have isolated the boiler and already connected the Live & Neutral - I've done lot's of DIY in the past but this the first time I've had to touch a boiler, so wanted to make sure. Have a great weekend and thanks again for you help :)

Good Evening All I'm installing a Nest 3rd Generation Learning Thermostat to my Vokera Option Boiler (manual PDF linked below). The boiler does not have a thermostat attached but as you can see from the first picture below and when installing the heat link I'd like some help identifying the...