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no c-wire or c terminal on boiler

nvadithya
Community Member

Hi everyone, I am looking for suggestions. I bout three Nest thermostats - https://store.google.com/product/nest_thermostat?hl=en-US&gclid=CjwKCAjwtfqKBhBoEiwAZuesiOUziFa9hDR_... When I did compatibility check, system showed me that i don't need a c-wire. After installing, thermostats started complaining about power issue. Looks like I need a c-wire and my existing set up don't have a c-wire. There is no c terminal on boiler as well. So, Nest power connector is not a option. Can some one suggest me what can be done in my case? Thank you. 

6 REPLIES 6

iamspirit23G
Community Member

Hi, I also have a boiler system without a C wire. In my research I found that the 3rd gen model would work on a boiler without a C wire. I installed it and it works perfectly.  Here's the one I purchased:

https://store.google.com/product/nest_learning_thermostat_3rd_gen?hl=en-US

Blessings!

Jake
Community Specialist
Community Specialist

Hey nvadithya,

 

I am sorry to hear you are still running into the issue. I would like to let you know that I am not an HVAC pro, but I will help out the best way I can. Do you mind me asking if you are able to send a picture of your current wire set up? There is a chance you may need to use a different generation of thermostat. 

 

You could also have a Nest Pro come out and take a closer look. They would be able to review the system, install the device, and ensure everything is working properly. Please let me know once you have sent that, and I'll be happy to take a closer look.

 

Best regards,

Jake

Jake
Community Specialist
Community Specialist

Hey nvadithya,

 

Sorry for the late reply. I wanted to follow up and ensure you are good to go. Please let me know if you still have any questions from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

nvadithya
Community Member

Hi Jake, i am still not able to figure out how to connect c wire. As mentioned before, I dont have a c-wire slot anywhere on boiler. Also, thermostat i have is 2020 nest which only have R slot where I have to connect R wire. If i use an 24v transformer, one wire will go to C slot on thermostat and where does the other wire go to? Please suggest what options I have. Thank you. 

Jake
Community Specialist
Community Specialist

Hey nvadithya,

 

I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity. 

Best regards,
Jake

Jake
Community Specialist
Community Specialist

Hey nvadithya,

 

It has been a few days since the last reply, and I am going to lock the thread at this time. If you have any questions, please feel free to create a new post. 

Best regards,
Jake