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gas furnace??? check the start capacitor, put unit in ac mode and see if fan comes on(switch fan to on at thermostat) if it does not a fan problem or capacitor problem. when in cooling mode thermostat controls fan, when in heating mode, furnace controls fan
Sounds like you have the thermostat fan switch in the "ON" position instead of "AUTO". Give that a try. Beyond that you could have a thermostat thats wired wrong or an outright bad thermostat. Its difficult to go any further without knowing what type of furnace and thermostat you have. I hope this helps though. Good Luck.
if you turn on just the fan at thermostat does it run. if not then the fan motor / belt / relay / start capacitor is the issue. if your not familiar with ac then you will need help to diagnose the air handler. belt is easy. just take a look by opening the side access panel