Gentleman, I am a long time lurker of the form and this is my first posting. I have an Enviro Fire EF3 that 13 years old. Each year I do a thorough cleaning by brushing the vent pipe then using the leaf blower trick after the flue brush. I also have a clean out tee at the back of the stove that removed and cleaned as well. For the past several years and this year too I have burned Somerset pellets at the rate of two tons per season. I have noticed the pellets this year seem to have more ash than past years. The problem I am have this year is the heat exchanger tubes are getting coated in creosote. So much so that I have broken off the rod to the heat exchanger scraper. This has been a reoccurring problem this season. This past weekend I cleaned out the flue again using the brush and the leaf blower. I have only burned about a ½ ton so far this season as it’s been rather warm in southwest Missouri. The flue pipe was extremely dirty and the flue cap had a black creosote coating. At the start of this season I replace the door gasket to insure a good seal. The other problem that has developed this season is the stove will go out. I run the stove at the 12 o’clock position and at times it will just go out. Pellets will be unburned in the fire pot. Also to the right side of the fire pot will be a bunch of under burned pellets. The odd thing it you push the igniter switch and the old thing fires right back up. The only I have ever replaced on this stove is the burn pot and exhaust blower. The blower was getting very loud with age. Replaced the exhaust limit switch because I got it so hot trying to burn off the creosote off the exchanger tubes. And repaired the heat exchanger scraper rod that I broke. This stove has truly been a work horse with minor problems. I have attached three photos. One is of the tubes, the other is of the inside of the stove and the burn pot. The last time I cleaned the stove was Sunday afternoon. Thanks in advance for the input.