hi there.
I will tell you how i have installed reciever.
On the boiler you have left to right control board Live,Netural,Space,Ns,Ls,Ns,Ls,Lr,Fv...Link in Ls and Lr taken out correct so far?
Celect Thermsave DRF 3 wiring diagram on reciever as follows...1,2,3,4,5 blocks...Netrual (1)...