We have a 2 year old Kozi shop stove in the basement. We have run it for 2 winters now with no trouble. we clean it out according to the manual before the new season and light cleanings regularly. We have been using it for about 2 months with no trouble and then all of the sudden about 2 weeks ago there appeared a smokey smell from the stove. I looked thoroughly and found no visible smoke coming from anywhere. We gave it a good cleaning and still it's a bit smokey. We have continued to use it with no increase or decrease in the smell. Any ideas?