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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).
When the thermostat light (Emergency Heat Light) is flashing or on during normal operation (whether in the cooling or the heating mode, but not the Emergency Heat mode), this usually indicates that the outdoor unit is locked-out.f the light doesn't go out or if the unit doesn't start, you may need to call for service, assuming you checked for the obvious; like tripped breakers or the outdoor reset button. Sometimes a unit will lock-out on a fluke or a weather-related condition, and resetting it will solve the problem.