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.
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.
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
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