I have a P68, everything has been great. I'm trying to test out some NEWP pellets and so thoroughly cleaned the stove so I could get an accurate picture of how much ash etc. I did not clean out the vent pipe, but did use one of those brushes that you would clean under your fridge with to clean the ESP and a little of the vent pipe I could reach. I also had vacuumed out the hopper. I used the auto ignitor as usual and when it first lit, I saw a cloud of smoke through the glass, which quickly dissipated. No smoke into house. It then fired up, got a nice flame, and continues to burn great. What the heck is that all about??? The dealer is coming for an end of the year check and cleaning in 2 weeks ($145) so he can check it out, but I was wondering if anyone had any idea what happened here, and if I should shut her down till then. Thanks.