Why Does My Fan Keep Running On My Furnace. Does your indoor furnace or air handler fan keep running and wont shut off. Make sure your thermostat fan setting is on AUTO not ON.
Unfortunately youll need a professional to fix both of these problems. To avoid this replace the filter. Then turn the thermostat to a temperature thats lower than the current room temperature and wait 3 to 4 minutes.
Check to make sure the fan is not in the fan ON position on your thermostat.
Dirty Furnace or Air Filter. If its a reusable model make sure to keep it clean. Fan on your furnace runs all the time and will not shut off. Set your fan to auto.
