I have no c wire. This Nest is supposed to work without one, bu

[rgaila]

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Original Poster: jack sidote  

Just need to confirm this works without a c wire, as it said when I looked it up.

Would a c wire be blue?

[rgaila]

Hi Jack, 

Thank you for reaching out, and I am sorry to hear about what's happening with your system. This error means your Nest Thermostat is not detecting the C or common wire. If you have a 2 wire system connected to your new Nest Thermostat, it is required to have a common wire connected. This is to provide stable power to your Nest Thermostat, and to prevent draining of its internal battery, and be connected to your WiFi.

You can check your wiring, look for unused wire, or check this link to know more how to install a common wire. There is also the Power Connector available on the Google Nest store that can replace a common wire as an alternative. 

-From GArrett DS, Community Specialist.

[Hockeulvn]

Tech was at house and says there is bo common wire in a 4 wite sustem  box days nest will work without a common wire but app will not let you configure without choosing a common wire  what a piece of crap

[Markjosephp]

Hello Hockeulvn,

Thank you for taking the time to let us know about your inquiry.

The Nest Learning Thermostat can typically use the cooling and heating cables in your system to charge its internal battery. To reliably supply power to your thermostat, however, there are some circumstances when they would need to connect a common or C wire or the Nest Power Connector.

Please take a look at this article and let us know if you need more help.

Regards,

Mark

[Markjosephp]

Hey there,

I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Regards,

Mark

[Markjosephp]

Hi Hockeulvn,

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

Thanks,

Mark