Sorry I have not replied untill now. Have been back to the hotel. The problem was that the roof void the unit is in is quite cold. Even when you change control so it should be measuring room temp from wired controller it is still taking it from the return in the roof void. As soon as I warmer thermistor on units return it started cooling as it should. I wired the remote air sensor into the room and all is now fine. Strange about the wired controller. Changed the program heard inside unit beep to say it acepted the change, get the little icon on the controller, but warm the thermistor on it nothing happens. Get into roof void warm thermister on the return and it works.