Turn off your gas furnace's power and turn off the gas line that runs to the furnace. Open your furnace's maintenance hatch.
Vacuum the room around your gas furnace to prevent dust or dirt from clogging the burners.
Locate your gas furnace burner under the heat exchanger or firebox. Vacuum the burner with the brush attachment to remove all the dust and lint from around it.
Blow compressed air into all of the burner's holes to remove any dust or dirt that could clog the burner holes.
Close the gas furnace maintenance hatch and turn the furnace and the gas line back on.