In your first post (about 2 months ago) you said:
I bought a house and it is having Boiler 532/i by Scottish gas
Does that mean:
1. The 532i was there when you moved in; or
2. You had a new boiler installed?
If it was there when you moved in, has the heating ever worked since you moved in?
If it's a new boiler, call the installer back and get them to sort the problem.
You have a combi boiler, which doesn't require a 3-port valve.
Can you find the other end of the grey wire from the receiver terminal 5. (it's in the same cable as the wires to boiler terminals N and L).
I bought a house and it is having Boiler 532/i by Scottish gas
Does that mean:
1. The 532i was there when you moved in; or
2. You had a new boiler installed?
If it was there when you moved in, has the heating ever worked since you moved in?
If it's a new boiler, call the installer back and get them to sort the problem.
You have a combi boiler, which doesn't require a 3-port valve.
Can you find the other end of the grey wire from the receiver terminal 5. (it's in the same cable as the wires to boiler terminals N and L).