Nest Thermostat Wiring

[thutong2002]

 

After installation of my nest, the fan is still running even though I have turned  the Nest off.  I have a picture of my wire setup below. Is there anything wrong or mising with the wiring connection?

 

 

 

[mikev552]

It would be helpful if we could see how you wired the Nest. Also, the pic of the old back plate is blurry and we cannot see the letters the wires are going to.

[MelbaDT]

Hey folks, 

Thanks for responding here, mikev552. 

thutong2002, please provide a clear photo of the original thermostat wires as well as how you wired your current Nest one so we could take a closer look at them. 

Best, 

Melba

[Patrick_Caezza]

I'm going to take a guess on the wiring.

Try this wiring

Green - G to G

White - W to W1

Yellow - Y to Y1

Red - R to Rc (jumper to RC not needed)

I always suggest that you install a C wire to stop any problems down the road.

Does the fan turn off if you remove the Green wire from the G terminal of the Nest?

[MelbaDT]

Hey folks, 

Appreciate again your help, Patrick_Caezza.

thutong2002, you may try the wiring guide provided by Patrick above. However if you encounter some concerns, please provide a clearer photo of your original thermostat wires showing the terminal labels so we could take a closer look at it. 

Best, 

Melba

[thutong2002]

Hi All,

   Thank you for reading my post. please see pictures for old and nest wiring. The fan still running after I did turn the nest off

 

  

[Ryan_G]

Hi thutong2002,

Thanks for the reply and we're sorry for the delay.

One suggestion is to have C (common) wire to be connected on your Nest Thermostat. If there's a unused wire from your HVAC unit, which can be checked by looking at the main control board. We could use it as a common wire.

Let us know how it goes by replying to this thread.

Regards,

Ryan

[thutong2002]

Thank you for your response Ryan.

After I purchased a 24 volt transformer, C wire adapter, my setup is working smoothly. I have a jumper going from Rc and Rh and the C wire connecting C and Rc. There are a lot of wires and so the setup does not look very tidy. I was wondering if there was a way I could have it running with less wires. 

[thutong2002]

Please see the picture

[Ryan_G]

Hi thutong2002,

Thanks for the reply and for including a photo with it.

It's great to hear that your system is working smoothly now.  I looked at the photo and I can see additional wire exposed on the wall. You could use a cord/wire hider that matches your wall color as there's no other way to lessen the wire coming into your Nest Thermostat. This is widely available from any hardware store. 

I hope it helps.

Regards,

Ryan

[Ryan_G]

Hey folks,

I just wanted to follow up and see if you're still in need of help. Please let us know as we would be happy to answer any questions you may have. 

Best regards,
Ryan
 

[MelbaDT]

Hi, 

We haven't heard from you in a while so we'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