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In the attached photos you can see the wiring and wiring diagram of the receiver I am looking to replace with my Nest Thermostat E Heatlink. My question is around the Common connection. As you can see I have a jumper from L to COM. Am I correct to believe that I should use L (brown wire) as...

Hi, I am doing a lot of work in my extension and had to remove the radiator. I took the radiator off a couple of days ago quite easily although had a bit of trouble undoing the nut on the control valve side. After a bit of careful force I got the nut loose and took the radiator off...