OK- I am having thr same problem as no heat- except I have no smoke in the house, thank goodness! Pyro- Thank you for putting the Harman site on- The booklet that I got with mine is a copy machine run off- not a booklet with clear pictures- it is for the Accentra. It says 'R3' on the booklet. I also was not offered to have the stove put in for me. Maybe because they are 4 hours away...( I am in BFE). When it is daylight tomorrow, I will try to clean all parts again- it is supposed to be 7 degrees Wednesday!! Pyro- what is happening when the fires actually starts- it gives a big 'clang', like a metal door is slamming shut. It does not happen very often- usually when the fire starts it is quiet. Because I had to install it myself, there was no check of the Draft meter- you told No Heat to take the nut off, and light a match, and see if there is updraft of the flame. Do I do this when the stove is 'attempting' to start- or with it totally off? Sorry- dumb female question! What do I want the flame to do? I am at 5,500 feet above sea level, if that makes any difference. I'll probably think of more questions later. Oh- No Heat- last year when it was doing this, I took the vent off the stove- where is attaches at the back, the 'T'- the part of the 'T' that points down. It was full of ash. It took care of the problem. Not this time, though!