I have a simple comfort 2000 thermostat in my new house .in my temp will not go down

SOURCE: thermostat issue with comfort zone II.

Is this an electric or gass furnace - Eather of these can can have this problem its most recomendable that you call a seviceman .
in the case of electric furnace you may requier a new heat sequencer. And in the case of gass you may requier a new relay.

SOURCE: Thermostat unit not cooling house.

Okay. Here's what I suspect in order of probability:

- low refrigerant charge
- contactor not getting 24 volts from controller (controller problem)
- bad contactor
- bad capcitor

I'd start with the charge, as suggested by mastatech. But if it is low, you'll need a service call, anyway, so pressing the needle valve may not be necessary.

I'm assuming you're not going to be taking the unit apart and testing stuff, so you'd need a service call for that as well.

I guess bottom line is, call for service. At least, I think we've ruled out simple stuff which will avoid paying for a service tech to come out and flip a switch.

Maybe mastatech has some other recommendations.

SOURCE: Can not figure out how to control thermostat

If you take off the front control panel cover (simply prying off on the edge with finger) you will find 2 small buttons under the display panel, one being mode and the other being prog.

Press both simultaneously and hold down for 5 secs and the display will blink, press prog to advance to what you want to program, kinda like setting a timex watch. As I recall you can set degrees celcius or farenhight/ cycle/Hi/Lo etc.

Just keep in mind when you set using the up and down arrows:

flashing H means: at what temp do you want HEAT to kick in?

flashing C means: at what temp do you want AC (if you have it) to kick in....if no A/C fan simply blows air.

Hope that helps.

SOURCE: thermostat reset???

after you changed the battries did you check the set point. it is also possible that the batteries have ruined the stat