I got a Harman P68 installed on January 4th of this year. Worked great for the first month and a half, then I started getting smoke when I opened the door to scrape the burn pot. I did a thorough cleaning inside the stove, including the combustion fan blades, and the pellet cleanout hatch, but that didn't fix the problem. I called the dealer and he said that because of the wet year we had, the pellets are creating a lot more ash than normal, and even he himself had to clean the stove pipe midseason because of smoke in his house. So I cleaned the entire stove pipe and the square exhaust channel, and recaulked all of the vent pipe seams (thinking the tape I used wasn't working). I have less smoke now when I open the door, but as soon as I start scraping I get smoke, which quickly travels through the house. The stove is in the basement, with 3 inch vent pipe running 6 feet vertical, then 2 feet horizontal out the house. The dealer said the outside air kit wasn't necessary, because our house isn't tight enough to need it. I'm running room temp manual mode (which is awesome!), and using a feed rate of 4. I have about 2 inches of ash in front of the fire, so I know I'm not running it too rich. I don't get any error messages, everything works just fine, except when I open the door it's not sucking the smoke out like it used to. I'm starting to wonder if manual mode just creates smoke because of the amount of burning pellets in the burn pot when I scrape it..... when I ran it in room temp auto for the first month, I did not have this problem, but I didn't like the stove turning on and off many times throughout the day, and much prefer a constant heat source. I will be calling the dealer back to let him know the cleaning didn't completely fix the problem. He's probably going to want to send someone out to look at it, but I would rather not pay for service on a stove that's 2 months old, especially if it's something simple! Any thoughts or comments?