Nest 3rd generation thermostat installation

[DC771]

• My original wires from the furnace has 6 wires. I tried installing but my ac comes on when I want to run just heat. 
• W - tan wires
• C- blue wire
• Y- yellow wire
• G- green wire
• R- red wire
• Ob- brown wire (Not connect)

[moralesvicente]

Hello  DC771, 

Thanks for reaching out to the Google Community Forum. It seems like you might be having some troubles with the installation of your Nest Learning Thermostat 3rd Gen, so don’t worry; it's a pleasure to assist. 

• Could you share a photo of your previous and current wiring setups? 

This information will be useful to provide you more information. If you have any additional details, please keep me posted.

Best regards,

Daniel