- 1). Turn the thermostat, typically located on the control panel near the bottom of the furnace, to its lowest setting. Turn off the electrical power to the furnace by flipping the electrical switch near the thermostat.
- 2). Remove the upper access panel by lifting it up and pulling it out and away from the furnace.
- 3). Turn the gas control off. Depending on your Lennox model, you will either have a gas control lever or knob. If you have a lever, slide the lever to the off position. If you have a knob, rotate it clockwise to the the off position.
- 4). Wait five minutes to clear any gas out of the lines. Once five minutes has passed, turn the gas back on.
- 5). Replace the upper access panel and turn on the electrical supply to the furnace. Turn the thermostat to your desired setting; the pilot light will ignite. If the pilot doesn't light, there may be air in the lines, so repeat the process once more to clear any air out of your gas lines.
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