Hi folks, I have a Carrier A/C (Model 38BRC048370) and Gas Furnace (Model 58STA090) using a Basic Digital Thermostat by Honeywell (Model 69-1490). Since the last couple of weeks I noticed that the place does not cool as much and the Room temperature (82F) never reached the temperature that I set on the Thermostat (76F). The air that came out from the vents seemed to be cool at first, later it seemed to get warmer. When I checked the A/C unit outdoor a week ago, the unit did not seem to turn on and it seemed that the capacitor and contactor were bad (contactor had an open coil), and the 24V fuse on the furnace circuit had blown, so I replaced all those 3 parts. Now, I do see that the A/C unit outside DOES turn on (both compressor and condensor fan) but it seems to stay ON!! If I manually shut off the system on the Thermostat, the A/C unit outside does turn off. However, I have the same original problem..... The room inside initially seems to have cool air coming out from the vents. Later the air seems to be warmer and the A/C unit outside seems to be fighting to reach the Set temperature (It is constantly ON). The thermostat shows 82F even though I set it to as low as 68F. Is it possible the A/C and Gas Furnace are ON, AT THE SAME TIME!!? The status LED on the control circuit in the Furnace box in the attic shows a constant RED light. How can I tell if the Gas Furnace is also engaging at the same time as the A/C? What could be the problem? Could it be a bad control board? Also, when I turn the Thermostat switch from "Cool" to either "Off" or "Heat" the LCD display on the Thermostat goes blank. Thanks in advance for your help!