Typically, the fan mode setting on Honeywell thermostats will have two (or three) settings: On, Auto, and Circ (for circulating). The On setting will help switch the fan to run continuously. When you choose this function, the fan will run indefinitely regardless of whether the cooling or heating systems are on or off.. 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.

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TB3 Communicating Fan Coil Unit Thermostats Honeywell
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Fan Control Display options are ON, AUTO, or CIRC. When
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Yes, circ fan runs randomly about 35% of the time not including heating or cooling time. If set to Auto it will ignore this feature but if Auto and Circ are displayed it will not (page 25). If you have only Auto showing and the fan still operates you may have a defective thermostat. Let me know if this helps. Thank you. Cycle through the modes until the required Fan mode is displayed and leave it to activate. Fan modes include: Auto: Fan runs only when the heating or cooling system is on. On: Fan is always on. Circ: Fan runs randomly about 33% of the time. *The circulate option that allows you to set the fan to run a certain amount of time per hour.