I've been burning in my F400 for three years now and never had a problem, a great stove. Tonight I loaded as normal and went away for a bit, when I came back the fire was raging, stove top thermomater was pegged at 800+ , I quickly turned the damper all the way down and noticed the lip just inside the door was glowing a bit. What does anyone think I caused any damage to the stove and what should I look for? Thanks in advance.