Part # AC-HLSB is directly connected to the top auger motor. In the event the hopper lid is left open while the stove is in operation, the hopper lid switch will prevent the top auger from turning. This is to prevent byproducts of combustion from entering the home through the open hopper lid and also to simply prevent operation with the hopper lid open. Improper hopper lid safety switch operation will result in a top auger that will not turn and therefore a stove that will not burn. NEVER place your hand or any object near the auger while the stove is connected to power.