![]() Now you’re re-starting the flow of gas to the pilot. Step 4: Turn the knob to "pilot" and press down the knob This will shut down gas coming through the pilot. ![]() Step 3: Turn the knob to "off" and wait 3-5 minutes You should see a knob with these 3 settings: You’ll have to open your furnace’s cover to access the reset switch. You may need to call a technician to help you reset the furnace. ![]() When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack.ĭo this: Turn off your furnace at the thermostat, and check the furnace filter. Your furnace may be blowing cold air because the filter is too dirty.Ī dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 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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