I posted a brief note about this when reviewing my Tower of Power, but I figured I'd come looking for answers with a specific post.
While testing my system today, the flame from the burner jumped into the area right behind the air damper. It happened twice, once upon ignition and once when the gas was cut by the valve. I am guessing that this means gas is leaking into this area, but I am not sure why this is happening. The appropriate connections are sealed with yellow teflon and tightened and I keep the gas turned down pretty low.
Anyone have any knowledge as to what causes this? Too much gas, not enough air, something else?