Nest 3rd Gen Install A/C blows hot

[Wellidas]

Hello

I bought a Nest 3rd Gen Thermostat to replace my Emerson Sen Si .As you can see below I hooked up the wires, However the System only blows hot air.

I installed the old one back the A/C works just fine.

Can someone help me with these wires? the confusing ones is the Black  Y2* and the white WE wire?

[Wellidas]

Here are the pictures of the old thermostat and the new Nest wired up but blowing hot air only.

Existing Thermostata 

Wires from the old one prior to disconnect 

Nest Wired, but only blowing hot air 

[luciaaa]

Hi @Wellidas,

Thank you for posting in the community and sharing the pictures with us. I'm truly sorry your current thermostat isn't blowing hot air, I'm happy to help!

Here's how to connect the wires to your Nest Learning Thermostat (3rd generation):

• Red wire goes to RC
• Orange wire goes to O/B
• Yellow wires goes to Y1
• Green wire goes to G
• White wire goes to star connector (*)
• Blue wire goes to C
• Black wire goes to Y2 

Let me know how it goes.

Keep me posted,

Ana

[Wellidas]

Hello,

No Luck, still blows only hot air. When I install the old one back A/C works perfectly. 😭

[luciaaa]

Hi @Wellidas,

Thank you so much for your response. I'm truly sorry to hear that your system is still blowing hot air. I'm happy to help!

To better assist you, could you please share a picture of your current wiring configuration?

In the meantime, I recommend performing a factory reset on your thermostat:

• Settings > Reset > All Settings > Reset

Please let me know how it goes.

Best regards,

Ana

[Wellidas]

Hello,

This set up here is what works with current thermostat a Emerson Sen si
THIS SET UP WORKS 

[Wellidas]

Also here is the set up I was advised on earlier, also it does not work. A/C does not blow cold air

NEST WIRED UP NO GOOD 

[luciaaa]

Hi @Wellidas,

Thank you so much for the pictures. I'm so sorry to hear that after troubleshooting, your system is still blowing hot air. I'm happy to assist you further.

Since you've already completed the wiring configuration and factory reset, I recommend changing the orientation of the O/B wire.

Please let me know if this helps.

Best regards, 

Ana.

[Wellidas]

Hello,

I changed the O/B Wire as instructed, the system now works just fine.
Thank you for your support.

[luciaaa]

Hi @Wellidas,

Thank you so much for following all the steps. I am glad to hear your AC is working now.

Have a wonderful day!

Best regards,

Ana