We have a similar set up and have been in our house for 5 years. I believe ours actually has three sensors; one for outside, one for the slab and one for the temperature in the basement and then uses some sort of formula to determine when to come on. We also have three “normal” vents in the basement.
What we have learned is they are just finicky systems and you need to monitor and make slight changes regularly. It wasn’t a big deal until our daughter was born and her room is down there. I just set up a temperature sensor in her room and monitor it and make changes as required. Funny enough, we actually had some issues in the summer as the AC would cool the house down too much and then the in floor heat would kick on. Took me far longer than I’d like to admit to figure out that was the problem.
I’ll be following this thread to see if you find any solutions, as I would certainly rather have a normal thermostat to control it.
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