My thermostat has different wires than the nest

[Ajamunsell]

My old thermostat had wires for Rh (red) RC (red) W(2 whites) Y (blue) and G (green), my nest thermostat has spots for Y C W G R and *OB. There aren't enough spots for me to hook up the old wires to...

  

[Patrick_Caezza]

It looks like you have a separate heating and cooling system and not one that is combined. If this is true, then only the Nest Learning Thermostat, 3rd Gen is compatible with it.

There should be two cables on the back of that baseplate. One will have a red and white wire at the minimum and the other will have a red, white, blue, and green wire. 

The cable with only the red and white wires should be coming from the heat only equionebt and the other cable from the cooling only equipment.

You need to look at the air handler for the cooling equipment and see what the white wire is conneted to.

Post what you find here

[aatienza]

Hey Ajamunsell,

Thank you for sharing your insights, Patrick_Caezza. 

I'm chiming in to check if you have more questions about this. Feel free to let us know by replying back. Also, you could check on our Compatibility Checker or this link to know more about your system's compatibility with our Nest thermostats: https://bit.ly/3qZ6OQ1
 

Thanks,

Archie

[aatienza]

Hey Ajamunsell,

I'd like to bump in here to 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.

Thanks,

Archie

[aatienza]

Hey Ajamunsell,

I'd like to bump in here to 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.

Thanks,

Archie