I'm fortunate enough that my mistakes haven't ruined my pellet grill. "It Got Away From Me"The single biggest reason people have any problems with their pellet grill is that they haven't kept it clean. The message on my Pro 575 says each time I turn it on, "Clean Grill, Fire Pots Don't Clean Themselves." If you don't clean out the inside of the grill, dust from the pellets can accumulate. Ken Hayes Ken HayesMistake 1 - Grease Residue In Drip TrayI cleaned out my fire pot pretty regularly, so I was surprised when my first fire happened.