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Well it works thanks. However and just to make sure I am doing this correctly, I have set the programmer to on (constant) and therefore heating will (should) only fire up when temp drops below what new stat is set to. This seems to work but the hot water is now on constant all the time. This was...

I will give that a go thanks. I assume I keep the loop wir (defailt) as is. this is a little red wire that connects L and L In on the thermostat. It was already there when purchased. Matt

Okay so basically I run a L and N wire(s) from 1 & 2 from the existing programmer box to L & N on the new thermostat? And then run a wire from terminal 4 on the programmer to SL(on) on the new thermostat? Is that it three wires? Matt

Hi, I too have just purchased the same thermostat and want to connect it to my existing LP722 programmer. I have a gravity fed Oil burner and I am stumbed to which wires to connect to the new thermostat. I have taken the front panel of the LP722 where it is has N, L (1&2) and then a brown and a...