I bought a USSC 5500M from TSC. I have it in my basement witch is mostly below grade. I had a wood burner in the basement hooked to a 7"x7" clay lay lined chimney with a piece of 6" clay pipe running thru the block wall. I put my pellet stove in the same location and relined the chimney with the 3" pipe. I have 2 90˚ bends inside the house and a clean out T in the chimney. The pipe rises 4' off the back of the unit then goes back 2' and up another 20' to a vertical vent cap ( not the hood that comes with a kit). I have been experiencing problems where the fire will burn down and no pellets are being dropped. Sometimes if I open the hopper door and then close it pellets will start to drop, but by then sometimes it is too late. It does not seem to want to go past heat range 2. I have also noticed the fans running after the stove is bone cold, or when I first plug it in. Sometimes they will come on by themselves when the unit is off. I pressed the OFF button last night before I went to bed around 11 and they were still running when I got up around 6. Is this in any way connected to my exhaust setup, or do I have a defective part somewhere? I do not have an OAK because it did not come with one and no local retailers carry them or the 2" metal hose. I was told by a dealer of another brand that I didn't need one. I have had the control board replaced and the new one acts the same as the old. If I run the factory test the draft fan only comes on for a split second then goes off then continues to pulse like that. When I called about it I was told that was normal. I don't think they understood what I was trying to tell them. What do you think?