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Thank you Echo. didn't notice the 4th terminal was called terminal 1 on the t6360 when i typed this post. Thanks again!

The Boiler is a Worcester bosch green star 25i.

I went to remove my old nest today which was installed when we had a combi boiler fitted and I had a quick question. I want to take the heatlink out and replace with a simple honeywell T630B but i noticed instead of a jumper on the live to the common there's a second live coming from the boiler...