cooling Not an option on new nest.

[julian_madison]

I just installed a Nest thermostat and the heat is great, but it does not recognize the Honeywell AC unit as existing.

It says the Y wire is unkown.. Somewhere i read to install the K wire from a honeywell system to the Y wire of the Nest thermostat. 

here is a shot of my original wires 

here is a shot of the existing wires.

any thoughts?

thanks!

Julian

[Patrick_Caezza]

The K wire on a Honeywell thermostat combines the Y and G wires. This is done using the Honeywell wire saver, which is incompatible with the Google Nest Thermostat.

You must replace the Honeywell wire saver with the Google Nest Power Connector to correct this. You need the power connector because you only have 4 wires, and 5-wires are required.

[Jenelyn_O]

Hi there,

Thanks for posting in the Google Nest Community forum. I hope you get the answer you're looking for provided by Patrick_Caezza. You can visit this support article to get more information about the Nest Power Connector. 

I appreciate your help, @Patrick_Caezza.

Best,

Jenelyn

[EmersonB]

Hello everyone,

@julian_madison, we wanted to follow up and see if you are still in need of any help. Please let us know if you are still having any concerns or questions from here, as we would be happy to take a closer look and assist you further.

I appreciate the help, Jenelyn and Patrick_Caezza.
   
Regards,
Emerson

[Dan_A]

Hey there folks,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Cheers,

Dan