Had problem with seldom used fireplace stove insert. Your on site rep helped me try to trouble shoot, and finally offered a replacement blower motor. Mine had burned out after about 200 hrs of useage. Since installing and opening the input slide to full, the unit runs great! I'm a bit frusterated with your operating instructions. Seems like too much data, and not enough info. I never read clearly how the slide was to operate. in addition, the slide control used is fine for stand alone unit, but for fireplace insert, a shaft extenstion should be added thru the side gap allowing for adjustment when unit is running. This would be an easy check when troubleshooting. ie grab little handle and slide outboard. If clarifiaction needed please call 260-241-8242