whoops with the programmer

[pswurkxm]

beleiving im this clever b*****d,just had a brand new potterton suprima he boiler fitted, i thought good idear lets fit a new programmer, so i purchased a danfoss fp715si programmer, to replace my old switchmaster 900, which wasn't working correctly any way.
wires wires everywhere.
2 main cables coming from the ceiling down to the programmer
another 2 from the fused power supply( disconnected )
now i know i cable from the power goes to L and N and E but where does the second live go to ?
i also guess that cables from the ceiling go to 1 & 3 and 2 & 4
so its just that second live cable ?
any help please

 

[Taylortwocities]

You will, of course, have made a note of what went where on your old programmer?

Usually the new ones come with a wire chart that tells you what goes where from the old to the new.

TTC