Sounds like the thermostat needs to be configured correctly or connected to the thermostat wiring correctly.
Most thermostats are compatible with a huge range of equipment. Just need to configure and wire them to match the equipment that is in place. Sometimes a minor misconfiguration or mis-connection can cause a major issue, sometimes a minor issue.
I am for doing good to the poor, but...I think the best way of doing good to the poor, is not making them easy in poverty, but leading or driving them out of it. I observed...that the more public provisions were made for the poor, the less they provided for themselves, and of course became poorer. And, on the contrary, the less was done for them, the more they did for themselves, and became richer.
― Benjamin Franklin