Thanks for reaching out. I'd love to know more about this. Could you tell us the make and model of your current thermostat? I would also suggest tracing the wires on your control board to see where the U1 wires are connected to.
Looking forward to your response.
Do you know what the two wires U1 U1 are going to?
Here is the manual for that Tstat and everything is compatible but you need to determine the U1 wires.
I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.