This is what i have done so far.
Took the live ,neutral and earth from 3 amp fused spur.
screwed them into terminal into boiler {l/n/E}
Took the old cable from the wiring center from live and screw into terminal 3 {removed link between 3 and 4}
The other lead from wiring center which connected to the orange cable from 3 port valve into terminal 4 on boiler
The programmer is not operating the boiler
Hope this helps
Took the live ,neutral and earth from 3 amp fused spur.
screwed them into terminal into boiler {l/n/E}
Took the old cable from the wiring center from live and screw into terminal 3 {removed link between 3 and 4}
The other lead from wiring center which connected to the orange cable from 3 port valve into terminal 4 on boiler
The programmer is not operating the boiler
Hope this helps