No cool air with Nest Thermostat

[karrot321]

Hi,

I'm having an issue where the nest appears to only blow room / warm temperature air during cooling mode. Here's what I've observed:

1. No issues with old thermostat that had batteries

2. Fan only when in cooling mode

3. Heating works fine. When switching from O -> B in the settings, heat blows when in cooling mode. 

Any help would be appreciated. 

Here is the wiring. System is heat pump.

Old:

Green Wire is (G)

White wire is (O)

Blue wire is (Y) jumper to (W)

Red wire is (Rh) jumper to (Rc)

New:

Green Wire is (G)

White wire is (O/B)

Blue wire is (Y1)

Red wire is (Rh) 

[EmersonB]

Hello karrot321,

I appreciate your effort for posting here in our community. I know how it feels when the cooling system is not working. We'd be happy to take a look into this for you. Please fill out this form with all the needed information. Let me know once you’re done.

Thanks,

Emerson

[karrot321 · Accepted solution]

Hi @EmersonB, I fixed the issue by adding a c-wire. 

[EmersonB]

Hello karrot321,

Awesome — glad to hear that and thanks for getting back to us. We'll then go ahead and lock this thread after a day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.

Regards,
Emerson