topic Re: Can my newly installed AC run without the G wire, my heating does.. in Nest Thermostats

Can my newly installed AC run without the G wire, my heating does..

nestfantorono — Sat, 20 May 2023 03:24:50 GMT

So we had a 4 wire system old style thermostat, when we replaced with the nest, we had to use one of the wires for C (Power). When we first installed nest we didn't have an AC, just heating, and we didn't use the G wire, that is used when just running the fan. When we turn on heating the fan would turn on.

Recently we installed an AC unit, but the install guys connected the Y, but also said the G wire needs to be connected as well.

Does it make sense that heating (W wire) turns on the fan without a G wire connection, but the AC requires the Y and the G ?

Re: Can my newly installed AC run without the G wire, my heating does..

Markjosephp — Thu, 25 May 2023 20:48:21 GMT

Hello nestfantorono,

Thank you for taking the time to let us know about your inquiry. I'd love to know more about this.

Could you provide us with the type of HVAC system you have? Also, please check your thermostat's Heat Type in the Equipment settings. If you have a furnace, make sure that it is set to Forced-air.

Let me know how it goes.

Regards,
Mark

Re: Can my newly installed AC run without the G wire, my heating does..

Dan_A — Sun, 28 May 2023 20:49:24 GMT

Hey there,

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

Thanks,

Dan

Re: Can my newly installed AC run without the G wire, my heating does..

Dan_A — Mon, 29 May 2023 22:36:58 GMT

Hello again,

We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.

Cheers,

Dan