Does not recognize a/c on 3 generation learning model

[Jcarz]

Does not show any A/C classification. Heat and eco only. What do I do? Help!!

[johnCNA]

Check the Equipment menu on your Nest.  It will show the connections that it has detected.  If it does not show a connection to Y1 (cooling) it will not know you have A/C.  Pull the Nest off the wall and make sure the wire to Y1 is properly inserted and latched into it's terminal.

[DnA4813]

What if I only had 4 wires W, B, G & R? Heat works but no central air..

[MelbaDT]

Hey folks, 

Thanks for answering, johnCNA. 

@Jcarz, how's your Nest thermostat now? Let us know if you still need help with it. 

@DnA4813, what specific Nest thermostat do you have? Is this a first time setup or did your Nest thermostat work with it before? Also, could you provide a photo of your old thermostat wires so we can take a closer look into it?

Best, 

Melba

[DnA4813]

Here's a pic. No Y wire.

[MelbaDT]

Hey DnA4813, 

Thanks for the photo. 

Based on your wires, it seems that you only have a furnace and you don't have AC. If you think you do, please get in touch with a local HVAC tech or our installation partner, OnTech to re- check your wires and HVAC system. 

Best, 

Melba