Following. I have the opposite problem. Set fan to high or low, and the fan cycles with the compressor. Started looking into it with the thermostat. Only has 3 wires, not enough to control all functions independently. Thermostat is wired to a small controller in the ac unit, which is where I suspect the issue is. My ac unit has no identifying tags visible from inside the unit, guess I need to get on the roof and look. Have not found a lot online yet, but still need the model to search further. My thermostat is cool/furnace only, no heat pump or strip heater.