I have (5) wires coming from my HVAC unit. I have the BLUE wire which I have wire-nutted off. This is because I had to replace my original Honeywell WiFi T-Stat (T-Stat failed) with a manually controlled T-Stat. The WiFi T-Stat had used the Blue wire and the new, basic T-Stat did not need the 24 vac Blue wire. The Nest install guide does not show the “C” terminal being connected to any wire. Should I connect my Blue wire to this terminal? Thanks.
If you are 100% sure that the blue wire is connected to the C terminal in the furnace/air handler, then connect it to the C terminal on the Nest thermostat.
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Thanks for posting in the Google Nest Community forum. I hope you get the answer you're looking for provided by Patrick_Caezza. For your safety and for the safety of your system, make sure that your blue wire is your C wire. If you have anything in mind, please let me know as I'll be willing to assist you.
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.
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.
