vaillant 615 eco-tec wiring

[lightning]

Hello

vaillant eco-tec 615 system boiler

Have wired all stats and programmer up .

Used a 3 amp spur which is wired in to boiler

question is what terminals on boiler do i use to run to run cable up to wiring centre ,it is a y-plan

 

[londonboy]

Term 4 is the switch line.

 

[gas4you]

Just to clarify, terminal 3 is live out and 4 is live in (switched).

I only ever run switched live back to 4 and don't take it out from 3.