Hi, I have this unit since 2002 (New House). In last March I have replaced the Circuit Board by ARS gorup. Since that, this unit is not functioning properly between 6AM to 9AM on all seven days. Even I set the temperature to 75 for all times. When I look at the temperature at 6 AM it will go to 63 like that. Can you please tell me How to fix this problem? I don't see any reset button also.