This fall I aquired a pel pro cheap charlie, and this family is grateful for it! We just got over a cold spell so naturally I ran it at the highest feed rate and fan settings. I noticed today that the flame was dancing on the top of the burn pot. I shut it down, let it cool and found the burn pot was full of "crunchy" ash. I cleaned the pot and ash out of the sides, and all is well. What can cause the burn pot issue? Bad pellets? Air flow isn't an issue as the flame is bright and pretty, and it still puts out heat! Any insight would be helpful!! Thank you