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 to the common instead?
https://imgur.com/a/ksLHw
L from heatlink to 4
N from heatlink to 2
Call for heat to 3
what do i do with the extra wire?
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 to the common instead?
https://imgur.com/a/ksLHw
L from heatlink to 4
N from heatlink to 2
Call for heat to 3
what do i do with the extra wire?