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Yep. The timer has all slots on, but in the middle, there's a small flip, if it's on 0, then heating light comes off on the boiler, but if it's in the middle or on 1, then it comes on, but I don't think it ticks at all. Don't think the timer is doing anything relating to the thermostat. Which...

On the Honeywell receiver, it had the wires N/L to N/L then A/B to 2/3 on the Heatlink. Pictures below

The Honeywell thermostat was broken, so I opted to replace it with a modern one, hence the installation of the Nest one. Would you say the wiring is incorrect? If so, what should the wiring be? Yeah, that's correct, we have a USB cable powering it through the wall.

Ah, gotcha. The previous thermostat was downstairs in the hallway, but it was a Honeywell R6660D thermostat which is wireless. I've got the Nest thermostat powered by a power adapter as there's no common wire from the boiler to the hallway. Hope that helps!

Hey, thanks for replying! I've put the boiler thermostat on full and the Nest thermostat to 9 degrees, but still heating up the radiators. Can you clarify what you mean on the last bit?

Hi guys, I've wired up the Nest thermostat (3rd generation) to my combi boiler, which is a Baxi 105. The heatlink is showing up a green light, so all perfectly fine there. However, when changing the temperature on the thermostat, it says it's warming up, but the boiler is not firing up at all...