so... let me get this straight...

you turn the thermostat down - meaning you are setting it to a lower temperature and the fan is turning on due to that.

and when you turn the thermostat up - meaning setting it to a higher temperature, the fan is not turning on.


and that is not your desired result?

I must be confused, because that is the exact behaviour you probably want... temperature goes above the set temperature and fan turns on to cool things down.