i have a siemens rdh10rf/set to connect to my valiant ecotec pro 24 boiler but am confused as to why it is not working need to confirm the terminals i have connected two are correct live and neutrat are correct but the l1, l2 and lx? which one should i connect and to which terminals 3,4 or 5?

help

KROBERTSANDSONS, September 2010

Permernant L & N from boiler to L & N on stat.
Boiler terminal 3 to lx on stat.
l1 on stat to terminal 4 on boiler.

Carefree, September 2010