Thanks for the replies so far , original Thermostat are on 1 and 2 yep ,
Jackthom shall I just connect 2 & 3 on the Heatlink first to L and N above the old thermostat wiring at 1&2 first .
Tony , love the R4 van , more reliable than the current La Poste electric ones !
I am just about to replace my thermostat with a 3rd Gen Nest . I have a Franco Belge Idris Exclusive combi boiler , with a simple thermostat. But am struggling with the wiring on the Heatlink .
I'm going wire the L and N (on the Heatlink) from the boiler no problem then bridge the L to 2 on...