Missing cable C

[ARIEL23]

my nest works well two months, but last week it said missing cable C, I only have four cables, 

blue for Y

white for W

green for G

red for R 

so, I need another cable for C?

[ARIEL23]

@Patrick_Caezza please can you help me? I can't pass another cable through the wall, my nest does not turn off de air conditioner. 

[Patrick_Caezza]

@ARIEL23 

The Google Nest Thermostat requires a C wire for certain HVAC systems.

If you use the Nest Compatibility Checker, it will have a note like the following which informs you that you might need a C wire to work correctly,

There are a couple of ways that you can add a C wire, one is using a spare wire in the thermostat cable if one exsists. the other is to Use the Google Nest Power Connector.

[Markjosephp]

Hello folks,

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

Thanks for lending a hand here, @Patrick_Caezza.

@ARIEL23, in addition to what was mentioned above, I found a helpful article about the Nest Power Connector that would explain more about how it works. Let us know if you have more questions.

Regards,
Mark

[ARIEL23]

@EdwardT Hello, can you please me? My Nest use two AAA batteries, it should not requires cable C, but it has a sign that says missing cable C. 

[Jake]

Hey ARIEL23,

I wanted to check in and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.

Best regards,
Jake

[Markjosephp]

Hi ARIEL23,

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

Thanks,

Mark