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The FAN selection key has two or three positions: Auto, On, and on select models, Circ (Circulate). The Auto position will allow the system fan to operate whenever the heating or cooling system is turned on by the thermostat. The fan will not blow air unless there is a call from the system. This is the normal setting for a system fan.Why is my fan not coming on when the thermostat is off?
Problem: Fan will not come on in the “ON” position or your fan will not come on when you turn the thermostat down in the air conditioning mode. Solution: Test to make sure you are getting 24 to 28 volts AC between the G (green) and C (com) terminals on you fan center or control board.Why does my Furnace Fan keep running all the time?
Why Does My Furnace Fan Keep Running? When your thermostat is set to AUTO, your furnace fan should blow only when your furnace is in the middle of a heating cycle. But if your fan runs constantly, regardless of whether your furnace is heating, that’s not normal.What is the difference between fan and auto on thermostat?
Difference Between Auto and Fan on Thermostat. The fan is an option on the AC unit so that you can set your unit as customized as you want. The fan is used to help circulate the air in the home whether it is cooled or heated. It is a great way to keep the air moving and let the temperature stand longer.