Wiring question.

[LightTheSky1021]

I am very interested in purchasing the nest, but not sure if my system is truly compatible. I removed the existing thermostat, and see that there is NO green wire, that a blue one, that is connected to the green area is the existing old thermostat. Since I don’t see a green colored wire, will it not work ? Or does the blue go in green slot as showed below? Please advise.

 

[Patrick_Caezza]

Never go by just the wire color as there is no standard.

You can try this.

White - W to W

Yellow - Y to Y

Blue - G to G

Red - RC to R (jumper to RH not needed)

If there is a spare wire behind the thermostat, I suggest using it to create a C wire. If there isn't, you can use the Nest Power Connecter. I always install a C wire to help prevent problems down the road

[sporfrog]

Hello LightTheSky1021,

The color of the wire is not all that critical, it is the terminal letter.  While it is common a green wire is connected to G, any color will work. Nest Thermostats are generally compatible. HOWEVER, you may, in some cases, need a C (common) wire.

See the compatibility checker for more information about which thermostat will work in your case.

[MelbaDT]

Hey folks, 

Thanks again for lending a hand here, sporfrog and Patrick_Caezza. 

LightTheSky1021, I hope you've got the answers you're looking for. Feel free to let us know if you have more in mind. 

Best, 

Melba

[Ryan_G]

Hey folks,

I just wanted to follow up and see if you're still in need of help. Please let us know as we would be happy to answer any questions you may have. 

Best regards,

Ryan

[Ryan_G]

Hey there,

Thanks for being here in the Google Nest Community. 

I'd like to bump in here and make sure that you’ve seen our response.

Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Have a great day.

Best regards,

Ryan