installing a nest learning thermastat with only two wires in wall

[pounder]

How can I wire a nest learning thermostat for heat and ac with just 2 wires sticking out of wall

[Houptee]

It must be heat only system if it only has 2 wires.

Put red to Rh and other to W1.

It might work ok without a C wire but you have to try it and see if it gives you power issues.

Otherwise you have to run a new 8 conductor cable or try using the Nest power adapter device.

[pounder]

It has both heat and air.

[Houptee]

Since only 2 wires It might be a special communicating thermostat made by the company that makes your HVAC system.

If you post a picture of the wires connected to the thermostat show the markings on the screws and the brand we can help you.

[Jenelyn_O]

Hi folks,

Thanks for reaching out. Could you please provide the photo asked by Houptee? It will help us to move forward. 

I appreciate your help, @Houptee.

Best,
Jenelyn

[Markjosephp]

Hi pounder,

I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.

Regards,

Mark

[Markjosephp]

Hello pounder,

I'm checking in to make sure that you've seen our response. Please let us know if you have any additional questions or concerns before we lock this thread in 24 hours. 

Regards,

Mark