Had stove 500 with air barely open Went to bed and about 12 last night a new smell went and checked the stove it was fine. But i looked at the door gasket today and one side was kind of shredded and the bottom had shrunk and got rock hard. I have saw this a few weeks ago but thought nothing of till now. Think i am going to replace it i have also noticed shorter burn times this year. Thank you. Edit It was not creosote smell.