Replaced the batteries several times, but it keeps saying Lo Bat. Pushed the reset button and the display changed to show the temperature, but the heat does not come on. Tried setting the fan to ON, so now it is blowing, and set the program to Manual and pushed the up arrow to raise the temperature setting. This made the Auxiliary light come on and the fan is blowing, but heat is not rising to the temp that is set. Not sure what to do next.