I have a maple chase Thermostat control in my home. It was flashing low battery, I changed the battery,I had also noticed the temp had dropped to 63,(at all times I keep it set at 68 in the fall in winter months). Since I have changed the battery I cannot get the temp back up above 60. It will only blow cool air. Can anyone please help me. I have checked the breaker and its fine and there is no pilot light on this system. Please any suggestions