Nest thermostat distribution fan not starting in cooling mode

[Giri]

I just bought a Nest Thermostat not the learning thermostat.  I installed it and the heating seems to be working fine. While testing the cooling part, the compressor is starting but not the distribution fan.  I have a wire going to the "G" line.  What could be causing the problem?

[MelbaDT]

Hi Giri, 

Thanks for reaching out and sorry for the delay. I want to dig deeper into this.

Just to confirm, do you have a single speed system fan? Also, how many fan wires do you have? Could you post a photo of your old thermostat wires and your current Nest Thermostat wires?

I'll look forward to your response. 

Best, 

Melba

[Fred-g]

I’m having a similar issue. Fan comes on with heat but not when ac kicks on

[Fred-g · Accepted solution]

• Turns out my wiring setup was incorrect. Fan wasn’t part of initial setup and showed as empty. Added the fan wire to config and fine now

[MelbaDT]

Hey Fred-g, 

I'm glad to hear that you've figured out the fix and your Nest thermostat is now working as it should. 

Feel free to let us know if you still need help. 

Best, 

Melba

[MelbaDT]

Hey there, 

I haven't heard from you in a while so I'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