Originally Posted by jspec
So I went out and picked up another Thermostat . The house was about 80 degrees when we got back so I installed it put on a movie and went to dinner.
Who was the movie for then?
I came back and the house was around 68 and the heat didn't kick on. When I just the RH & W it works fine but with the new thermostat hooked up like it has been for the past 4 years it doesn't work.
For the past 4 years, that new thermostat sat in a warehouse without any wires connected to it.
Nothing seems to have changed Any ideas?
What brand and model thermostat did you get?
Remove stat from wall. With the stat still wired up, and calling for heat. Turn it around, move it a little. If you suddenly hear the furnace run or try to run while handling the stat. You have a bad wire or wire connection in the wall.
Seen a lot of thermostat wires wire nutted together inside the wall. If the red(24 volt hot) or common have a bad connection. Then the stat may not get enough power to operate both itself and the furnace.
Also check that you don't have any wire insulation under the screws.