Most pellet stove have an adjustment called “trim” that adjusts the feed rate of pellets – usually 3 different speeds – while in the # 1 lb. per hour setting. The purpose of this is that all pellets are not the same, in terms of how quickly they burn and the effect of the air shutter position on how quickly they burn. Consult your owner’s manual on how to adjust the trim, to ensure the flame stays burning while in the #1 lb. per hour setting.