![]() AUTO ensures that the blower will run only when the furnace heats the air. ![]() The fan setting controls the blower, the part that circulates air throughout your home, Setting it to ON means the blower will run 24/7-regardless of whether the furnace is heating the air or not, thus why you get cold air sometimes.ĭo this: Ensure your thermostat’s fan setting is set to AUTO, not ON. Check the thermostat’s FAN settingĭoes your furnace blow hot air sometimes, but cold air other times? Your thermostat’s fan setting may be set to ON. So before calling a professional for help, try these 4 furnace troubleshooting tactics. Well, it could be multiple issues some of them you can solve yourself. So you’ve turned on your furnace, but it’s giving you the cold shoulder by blowing cold air.
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