topic Re: 3 wires, labeled 1, 2, & 3 in Nest Thermostats

3 wires, labeled 1, 2, & 3

Andasibe — Thu, 21 Jul 2022 01:16:56 GMT

New home and first time heat pump owner. What am I missing here. 3 wires in old thermostat. Labeled 1, 2 & 3. The thermostat is telling me it has no power. All power sources have been checked and rechecked, all is fine on that front.

Any thoughts?

Re: 3 wires, labeled 1, 2, & 3

RT63 — Thu, 21 Jul 2022 16:25:52 GMT

There are more wires in your wall. So your old thermostat only used 3 of them, but you might be able to use more signals and control wires. I suggest that you go to your HVAC system and check which ones are connected and which are not. Then hook up the connected colors as instructed in your Nest install guide.

Re: 3 wires, labeled 1, 2, & 3

MelbaDT — Wed, 27 Jul 2022 09:21:43 GMT

Hey folks,

I appreciate your answer, RT63.

Andasibe, based on your current thermostat's wire labels, you have a proprietary system. These aren’t compatible with Google Nest thermostats. However, some proprietary systems can be rewired by a pro installer to be compatible. Check out this link for more information: https://bit.ly/39HgVRW

Best,

Melba

Re: 3 wires, labeled 1, 2, & 3

MelbaDT — Sat, 30 Jul 2022 09:28:36 GMT

Hey Andasibe,

Checking back in should you still have some questions here. Let us know by replying to this thread.

Best,

Melba

Re: 3 wires, labeled 1, 2, & 3

MelbaDT — Sun, 31 Jul 2022 09:48:19 GMT

Hi,

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.

Best,

Melba