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I set the thermostat up as a combi boiler so there is not hot water control nest side, I did reset the thermostat and set it up as "other" with hot water control but even then there way no way of operating the hot water, it still only gave me heat option which is why I came to the conclusion for...

Ok I think we are winning lol, link wire from L to terminal 5, GREY (lol) wire to terminal 6< still not cycling to heat the store and not hot water, sheer devilment had me move the grey wire from 6 to 4 and boom, working perfectly so far, boiler cycling, heat store hot, when call for heat it is...

Hey thanks for the quick reply :) So a link wire from L to terminal 5 then the grey wire left in terminal 6? I never remember doing anything with the old programmer at all, when we moved in for completeness I switched both to constant and then if we ever wanted heat we used the mechanical...

Hello, Ok a bit more progress made, the wire coming from the switch and also to the boiler is copper strand, I noticed in the instructions Nest say do not use this and thought I had no chance of getting 2 stranded wires into the Heatlink terminal so found some 1.5mm solid copper core wire and...

That makes perfect sense, thanks, appreciate it :)

Hi and thanks for the reply, it is a Honeywell ST9400C 1000, the programmer can control water as well I believe but with us having a combi boiler it made no difference what the water was set to the boiler did its thing and provided it, when we moved in the previous owners told us that the...

Hello, in need of some help please, bought a Nest 3rd Gen Learning Thermostat Kit, currently have an oil fired external combi boiler with a Honeywell Home Programmer and wired thermostat, the thermostat will become redundant and I need to replace the programmer with the new Nest heatlink, all...