Nest Thermostat compatability

Russinating

Russinating

Russinating

Soldato
Joined
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Bristol
Bit confused with this one. Just got an apartment and want to replace the wired thermostat (Boss) with a Nest. I ran the compatibility checker online which just asks what heating type it is, whether the existing thermostat is wired etc, and it says the Nest Thermostat E is compatible. But when I go through the setup via the app none of the wires match and it says it's not compatible.

r3aOFSb.jpg


If that's not clear the terminals across the top are N L 1 2 3 4 with Earth bottom right. It's pretty simple wiring setup that I'm sure I've seen before when fitting my previous Nest Thermostat.

Any advice?
 
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Erm you wire in the L N into the nest and the switch live in 4 to the switch live on the nest.
The E seems complicated, you'd have to figure out its manual.
 
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Mickie said:
Erm you wire in the L N into the nest and the switch live in 4 to the switch live on the nest.
The E seems complicated, you'd have to figure out its manual.
Click to expand...

I mean, thanks, but that does not clear things up lol.

This is the guide: https://nest.com/support/images/misc-nest-thermostat/nest-thermostat-e-install-guide.pdf. Page 7 even says stranded wires aren't compatible, which mine are. What difference would that make?!

This is the compatibility checker I used before purchasing: https://store.google.com/gb/widget/compatibility/thermostat?hl=en-GB. It's official and clearly for the GB market. It's even the one linked to from the manual. Literally all it asks is "What kind of heating system do you have?" and "Do you already use a thermostat?". Output is simply "Great news! The Nest Thermostat E will work in your home."

No mention of stranded wires or how the terminals are labelled at that point, only in the manual.
 
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High-voltage wires
If your thermostat is labeled 120V or 240V, or has thick wires with wire nuts, or has L1 and L2 terminal blocks, your system
is high voltage and isn’t compatible with the Nest Thermostat.
Your original thermostat is 240v and going off the nest thermostat it won't work.. there are other nest thermostats with a receiver that will take 240v and a switch wire and a separate nest thermostat with its own power supply via transformer plug.
 
wire in the L N into the receiver, that should be near the boiler and connect the wires from the source of the original thermostat into the low voltage parts of the receiver then you'll be able to wire the original wires for the thermostat into a standard nest thermostat, just two wires. hard to explain on here.
 
Russinating said:
Bit confused with this one. Just got an apartment and want to replace the wired thermostat (Boss) with a Nest. I ran the compatibility checker online which just asks what heating type it is, whether the existing thermostat is wired etc, and it says the Nest Thermostat E is compatible. But when I go through the setup via the app none of the wires match and it says it's not compatible.




r3aOFSb.jpg


If that's not clear the terminals across the top are N L 1 2 3 4 with Earth bottom right. It's pretty simple wiring setup that I'm sure I've seen before when fitting my previous Nest Thermostat.

Any advice?
Click to expand...


Take the two blues (N), join them together in a block connector, not connected to anything else.
Do the same for the single earth wire.

Remove the brown link from L&2 and discard.

Take the brown from terminal 1 and connect to C at the Nest.

Take the black from terminal 4 and connect to NO at the Nest..

If you need any help just message me and I'll guide you through it m8, I do this for a living :)
 
FlyingFish said:
Take the two blues (N), join them together in a block connector, not connected to anything else.
Do the same for the single earth wire.

Remove the brown link from L&2 and discard.

Take the brown from terminal 1 and connect to C at the Nest.

Take the black from terminal 4 and connect to NO at the Nest..

If you need any help just message me and I'll guide you through it m8, I do this for a living :)
Click to expand...

Thanks, I'll give this a go.
 
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