I was recently changing the batteries on my old thermostat and accidentally broke one of the prongs off when trying to reassemble it. I bought a new thermostat and have followed the directions the best i can but I am getting no responses from it. I can't get air to come on either in heat or cool mode. I have even tried two different models of thermostat. Any advise?
Check your connections. Is this a 2-wire? If so, connect the two wires at the thermostat end and see if the heater/AC turns on. If so, then your circuit is OK.
Now, look in the instructions for the thrermostat about connecting a 2-wire system (if this is the case.)