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Hi. On my boiler there is a box with a dial. This has a green light around it. It has numbers on it. What is this for? Is it a pressure release valve that can be adjusted? When I turn it to zero, it flashes and water flows somewhere? Lol. It was set at 2. It also turns clockwise to certain...

I will attempt this tomorrow. Can you tell me what wire goes where in a bit more detail? Maybe a photo or two. I would be most grateful. Kind Regards.