My thermostat will run the AC until the temp display gets to the preset, but then the display will stay at the preset and keep running. Also it occassionaly will drop below the preset and still keep running.
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The most likely problem is the wall on which the thermostat is mounted. The thermostat is designed to read the temperature of the space in the room, but if the wall is exceptionally warm or cold it can really throw off the actual reading.
Options might be to stuff insulation into the wall behind the thermostat, or relocate it to a wall that is more consistent in temperature with the actual temperature in the room.
It seems that you have the emergency heat running all the time. On some t-stats there is a switch that runs the emergency heat all the time.
The other thing that could be happening is that the out door unit is stuck in defrost so the backup heat is trying to run any time you are in heating mode.
Without checking what is energizing the heat coils with an electric meter it is impossible to tell what exactly is going on.
I can tell you that I'm sure that it is related to the emergency heat, though and if you can shut off the breaker that runs that for now it will help you out till you can get it looked at futher.
I hope that this will help you to solve your problem!
If indeed the program is stopping it you can find out by putting the thermostat temp on a manual hold. Set tstat to a desired temperature then push hold. If all works well then you will need to reset your program to fill your needs
On my Hunter model, there is a "Span" setting that allows you to change how long the AC/Heat will run before it turns off. Basically, it sets the acceptable range (above and below) your temperature setting. To access this press both the up and down arrows and hold them. "Span" should show up with a number (1,2, or 3). For your problem, change the setting to 1 so the AC will run shorter, and more frequently to keep the temperature more constant.