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The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
If you turned on the thermostat and the heater (or A/C) didn't come on, it may be a problem with the thermostat and not the furnace. First things first, make sure that all the settings on the thermostat are as they should be.he thermostat control is low-voltage and poses little risk, but best practice is to turn off the power to avoid injury or damage to equipment. The sub-base is screwed to the wall. You will probably see two or four wires coming from a hole in the wall and connected to screw terminals on the sub-base.