Nest Thermostat Wiring

[mrelmo]

When I originally installed my thermostat I did not connect the C wire and am running off the battery, So the wire says I only have the YWGR connected, but I need to tell the thermostat that I have now connected the C wire how do I go back in and change that thank in advance

[luciaaa]

Hi, @mrelmo,

Thank you so much for reaching out to the community. I’m truly sorry your thermostat’s battery is running low. I’m happy to help you and find a solution!

To provide you with the best assistance, please answer the following questions:

• What type of thermostat do you have?
• Was the C wire connected on your previous thermostat? 
• When did you install the thermostat?

Additionally, I'd appreciate it if you could share a picture of your previous wiring configuration. If you're comfortable, please also share a picture of your control board (usually located next to the furnace).

This information will help me guide you through the setup process and adding the C wire.

Feel free to reply if you have any questions.

Best regards,

Ana

[mrelmo]

Not really sure of the model it is the most basic, I installed it about 4 years ago and there was no "c" wire at that time on my old thermostat, however the wire was available not used. So a year ago I hooked the c-wire up but never reconfigured the wiring so I think the thermostat does not know the wire is connected now. How do I go back in and say I have 5 wires not 4 wires connected 

[luciaaa]

Hi, @mrelmo,

Thank you so much for your prompt response. I’m happy to assist you further.

To provide accurate instructions, I'll need the specific model of your thermostat, as the setup process can vary slightly. Once I know the model, I can guide you through the steps to reconfigure the setup and add the C wire. You can find your thermostat's model in this article: How to tell which Nest thermostat you have.

Please let me know if you have any questions.

Best regards,

Ana

[mrelmo]

It is the nest thermostat does that id the model?

[luciaaa]

Hi, @mrelmo,

Thank you for your prompt response. To effectively add the C wire, please share the following:

• A picture of your Nest thermostat.
• A picture of your current wiring configuration.
• A picture of your previous wiring configuration, if you still have one.

Please keep me posted.

Best regards,

Ana

[mrelmo]

OK I don't have a picture of original wiring, but here is the current wiring diagram, all I did was add the"C" wire but did not change it in the device as in telling the device that there are now 5 wires. Hmmm I don't have permission to upload files

[mrelmo]

OK here are the images

 

 

[luciaaa]

Hi, @mrelmo,

Thank you for your prompt response and the information you provided. I'm happy to assist you further. 

To add the C wire during the setup process, I recommend performing a factory reset on your Nest Thermostat and setting it up again. During setup, you'll see the option to select the wires; please choose them in the following order: W/W1, Y/Y1, G/G1, R, and C. 

Please let me know how it goes.

Best regards,

Ana

[mrelmo]

OK I will not be able to access it until Friday, at which time I will give an update, thank you.

[luciaaa]

Hi there!

Thank you for letting me know you'll be following the troubleshooting steps. Please keep me updated on the results.

Best regards,

Ana

[mrelmo]

OK all done I think all is good, at first it said g and c did not have power I checked all looked good completed the setup, it was a little scary as I had to delete the unit to reinstall and since I have another thermostat at another location I was not sure which one I was deleting but it seem good. Thank you for your help

[luciaaa]

Hi, @mrelmo!

Thank you for your response. I’m glad to know your thermostat is working with the troubleshooting steps in my previous post. 

Feel free to reply if you have any questions.

Best regards,

Ana