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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).
Is the thermostat installed in the proper location. This is very important as a thermostat installed on a wall that has high heat gain or heat loss will never offer you comfort as it will react mostly to the temperature of the wall and not the air in the living space.lace one end of the jump wire on the Y and the other end on the G-if the fan comes on during this connection, your thermostat could be faulty.You may need to test the transformer if nothing seems wrong with the thermostat. You can use a voltmeter or a multi tester.