Going through previous posts, I have found common causes for the E103 error. I'm wondering though whether people here have any thoughts on my situation:
Upstairs and downstairs zones, 2 Nest Learning Thermostats. Upstairs is fine, no issues, and cooling seems fine. Downstairs is showing the E103 error. Twice I've tried touching the red to yellow wires, which seems to work temporarily, then the error shows again. Suggestions?
