When my Harman P68 lights off it produces a huge flame that bounces off the top and sides of the fire box and blackens the top of the glass. After a short time the flames catch up to the amount of pellets in the burn pot and it burns well with a smaller hot flame. It has done this since the first light off when it was new. I keep the stove clean and have cleaned the area under the burn pot and made sure all the holes in the floor of the burn pot are open. It takes between 5 and 6 minutes to have a flame going. It has stopped feeding pellets before the flame starts. It seems like either too many pellets are being fed initially or the ignition is slow getting the fire going. I've inspected the igniter and it appears to be in satisfactory condition.