You can see into your ducts by opening your registers and using a flashlight. If you find any, repair with caulk or weatherstripping.įinally, ensure your ductwork is free of obstructions and leaks. Next, make sure there are no air leaks in your house. Change it to “auto” and see if that resolves the issue. If you set it to “on” instead of “auto,” the fan will run constantly. If that doesn’t help, check your thermostat. See the above question for information on changing your furnace filter. If your furnace constantly runs, you likely need a new filter. You may have a problem with your gas valve or blower motor panel. If these Lennox furnace troubleshooting steps don’t work, call a technician. Gently dust the components inside with a soft cloth or canned air. Turn off the power to the unit and open the cover. Our guide demonstrates how to change your furnace filter.įinally, clean the inside of your furnace. You can pick one up inexpensively on Amazon or at a store like Target. You should change your Lennox furnace filter regularly. If someone’s lowered it, the heat won’t start until the home temperature dips below that setting. Your system should be on “heat” and “auto.” Choosing on “on” instead of “auto,” will make the furnace constantly blow air whether or not it’s actively heating.Ĭheck the temperature setting. If it takes batteries, make sure they’re fresh. Ensure no switches have tripped or fuses blown. Lennox furnace is not heating or not blowing hot airįirst, check your power.
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