We have a similar issue. Our downstairs Nest Learning Thermostat
controls the upstairs and the upstairs Nest Learning thermostat controls
the downstairs. This morning I could not get the heat to be lowered
until I set it at 60 degrees. It kept showin...
Same issue here. Temperature set at 67 or 68 and often will not heat. I
have to push up to 70 before the furnace reacts and responds. Set a
schedule to go down to 64 at 2 AM, then up to 67 at 8 AM and it feels
like 78 in the upstairs. Not happy!