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Hahaha figured out why it isn't working ... The boiler has died

I have read the wiki but it doesn't seem to work... this is my old thermostat Yellow into 1 Red into 2 Blue into 4 My new thermostat is a Salus ST320 it has 2 terminals (3 counting earth) it has L (COM) and SL (NO) I have tried putting yellow to L and Red to SL...

Thank you both so much, Yellow was live, I also thought it was a little strange... So I did Yellow - 1 Blue - 2 Red - 3 and then ran a wire between 1 and 4 it works like a charm. Thank you both SO much. Its just a cheap thermostat off ebay ( Its the Digital Programmable Blue...

Hi all, My new thermostat just arrived and I am seriously confused... This is my old thermostat and its witing guide. Yellow into 1 Red into 2 Blue into 4 this is my new thermostat. am I right in thinking 1 & 2 is for the thermostats power supply? (there already is a...