Trane only has three wires How do I proceed

[Glenn817]

Trane only has three wires White,Red and blue How do I proceed 

[MelbaDT]

Hey Glenn817, 

Thanks for reaching out to the Google Nest Community. 

Could you share a clear photo of your current thermostat showing the terminal labels where these wires are connected to so I could take a closer look? Also, what system do you have?

Best, 

Melba

[MelbaDT]

Hey there, 

How's it going? Still need our help?

Best, 

Melba

[MelbaDT]

Hi, 

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.

Best, 

Melba