Here’s how you can check if you have C-wire:
- Check thermostat wiring
To check for thermostat C-Wire, turn off your HVAC system and go to your thermostat. Remove its faceplate. You will see various connections to their terminals. Look for a black or blue wire connected to the C terminal.
If your current thermostat is not smart, the C-Wire will probably be tucked away behind your current thermostat. To find it, remove the thermostat faceplate and unscrew the backplate. Next, pull out all the wires. Search for the wire bundle and look for an extra black or blue wire, or one labeled ‘C’.
- Check your control board
Go to your HVAC control board and look for a wire attached to the C terminal. Note down its color and go to your thermostat. Check for the same colored wire.
In some situations, your HVAC control panel has a C wire, which is missing at your thermostat side. A C-wire adapter can help in this case. It provides a dedicated power source to the smart thermostat.
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