Hey Lokisthunder1,
Thanks for reaching out and sorry for the delayed response.
This code means that your thermostat doesn’t detect power to a wire, or it can’t detect the wires in your thermostat. If I may ask, when did this start happening? Also, were there changes made to your thermostat or your HVAC system before this code started showing up? You might also want to try the steps I've outlined below:
- Make sure the power to your system is on. The power switch will usually be in your breaker box or fuse box, but in some homes it will look like a light switch near the heating or cooling equipment.
- Check the thermostat wires but first, turn off power to your system and thermostat at the breaker or fuse box before exposing or adjusting any wiring.
- Check that each wire is fully inserted into its connector and that every connector with a wire is down as shown.
- Check that each wire has ⅜ inch (6mm) of exposed wire.
- Turn the power to your system back on and check to see if your thermostat is working.
- Check that each wire is connected properly to the system board.
Keep me posted.
Best,
Melba
