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Wiring nest...not detecting c wire already installed

Pat12
Community Member

Installed the c wire nest connector,  showing all wires are live, app still saying c wire not detected ?? Won't let me continue set up...help

11 REPLIES 11

Houptee
Silver Product Expert
Silver Product Expert

I think you have to get the power connector to be detected not the c wire because you dont actually have a c wire connected to the Nest when you use the power connector.

Watch this video

https://youtu.be/xlx2Um6D1Z8

 

 


Houptee -- NJ Master HVAC Licensed Contractor

Pat12
Community Member

24 Volt Transformer, C Wire Adapter Thermostat, Compatible with Nest, Ecobee, Honeywell Smart Thermostat, Nest Hello, Ring Doorbell Power Supply (23ft Cable)

 
 
 
This is what I purchased because Nest was working at Thermostat but kept going off line..did I get the wrong thing and now need the connector? Thank you for your help 

Houptee
Silver Product Expert
Silver Product Expert

Oh ok I thought you had the little power adapter.

So if you are using a wall plug in transformer you have to put one wire in R with the thermostat wire also in R so 2 wires will be together in the R, and the other wire from wall transformer in C.

Post a pic of what wires you have installed.

Watch this video he explains it.

https://youtu.be/yi5kfn3bmEk

 


Houptee -- NJ Master HVAC Licensed Contractor

Markjosephp
Community Specialist
Community Specialist

Hello folks,

 

I wanted to stop by and see how I could help.

 

Thanks for guiding the customer. @Houptee.

 

@Pat12, I appreciate you sharing how you installed a 24V additional power source to your thermostat. How's it going with the installation? Still need our help? Please let us know if you need more help so we can assist you right away.

 

Regards,

Mark

We r still working on it but will let you Both now how it works out for sure, thanks!

Markjosephp
Community Specialist
Community Specialist

Hi Pat12,

 

Sounds great! Thanks for informing us that you're trying to make it work. If anything comes up, don't hesitate to give us a shout, as we would be glad to know what the result would be.

 

Regards,

Mark

Hi guys, everything working OK with app and thermostat, however, inside thermostat is reading about 8 degrees above the actual temp in house ..I did read it takes a few days to adjust but this morning it was correct ? I tried to post a pic but doesn't seem to be coming thru? Any suggestions or just let it ride? At this point, I'm not sure I want to keep it..I installed one at our beach( air & heating there) and it's working perfect there. At home we only have oil heat, radiators? Thanks 

Pat12
Community Member
  • Hi we finally got it to work with the app following your guide. I took a pic so u can see, a problem I'm having is now it says it's 78 in the house which is not right. I have another thermometer saying it's 73, heat set at 68...I'm worried the heat won't ever go on if its not working right? My hubs is an electrician so we know it's wired right...uggg 

Pat12
Community Member

Here's the pic what do you think? Tia

 

 

Pat12
Community Member

We could not fit both wires into R so he spliced them together and put 1 wire in ? 

Houptee
Silver Product Expert
Silver Product Expert

I don't see any pics showing up in your postsIf you do a power test it should show the Vin and Lin reading to make sure you are getting enough power to R and C. If this is the Nest non learning model go to the nest and hit settings equipment power status. You should see Vin above 24v and report back what the other readings say.


Houptee -- NJ Master HVAC Licensed Contractor