Wiring a Nest thermostat question

Double07

Double07

Double07

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Joined
10 Jan 2006
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Scotland
OK so I bought a nest 3rd gen learning thermostat from here, and I am sure it works, no reason to doubt it. I have just moved into a new flat but the control mechanism thingy for the boiler is knackered, hence the purchase of the Nest. Boiler works completely fine in manual mode, just the remote module is goosed.

I am waiting on getting a mate who is a heating engineer to come round and fit it, but it's taking ages given he is doing it as a favour, its winter, its Scotland, its p***ing down from the heavens, etc, etc. so I thought surely I can wire it up myself given the boiler already has a wirelress thermostat albeit the module itself is knackered. Surely its just a case of copying the wiring?

So I disconnected the current heatlink which looked like this when wired up

https://i.imgur.com/6qoGzZW.jpg

So it's reasonably simple right, live and neutral and two identical black wires into the call for heat and the other for yeah I dunno :). So i tried wiring this up to the nest in the same pattern, it powers on but hte yellow light (disconnected) stays on. I tried reversing the two black wires in case I got them the wrong way round but it's the same. THe heating works fine in manual mode with the nest connected.

https://i.imgur.com/lT6HK80.jpg

So does anyone know what I am doing wrong? I know I can wait for my mate to come do it but it's doing my head in a bit and it's not like I need to actually wire anything into the boiler itself so I can't see it being that unsafe surely? I have some examples online where a cable is wired from 2 on the nest directly back into the live terminal, however given that was different to what my original wiring was I didnt want to risk that, I am not crazy after all just impatient :)

Anyone have any insight?

Cheers
 
The yellow light means the heat link has lost contact with the thermostat. If you press the button on the heat link, you can manually activate the heating. Try this first and see if it turns your boiler on - at least you'll know if your wiring is correct.

You can then Google to see how to reconnect the thermostat to the heat link.
 
fezster said:
The yellow light means the heat link has lost contact with the thermostat. If you press the button on the heat link, you can manually activate the heating. Try this first and see if it turns your boiler on - at least you'll know if your wiring is correct.

You can then Google to see how to reconnect the thermostat to the heat link.
Click to expand...

The heating works fine in manual mode, so are you saying that its the heatlink not being able to connect to the thermostat? I guess moving them closer together will show if that is the case, ill try that first of all.

**EDIT**

nah it's not that as it's still the yellow light that shows as if it's not connected properly. It should show a blinking blue light to show that its ready to pair with a wireless device but hasnt yet done so. The net work settings in the thermostat are fine, connected to my router all OK. Must be the wiring, Ill probably just leave it to the bloke who knows what he is doing rather than me :)
 
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