Looks like your Y1 wire is having an issue. Would suggest removing the nest from the wall, turning off the power , and reseating the wires to ensure it isnt just loose. When you take out the Y1 wire take a close look at it to ensure there is no visible corrosion.
Just wanted to jump in here to check to make sure that you saw the response from Ashepherdson. Shoutout and huge thank you to Ashepherdson for the help here. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.
Have a great day.
It looks like we haven't heard back from the OP so I'm going to go ahead and lock the thread. If you have any further questions or concerns, feel free to create a new thread.
Have a great day,