USSC Pellet Stove (Convection/Room) Blower. The convection blower is responsible for circulating air around the stove and into room. If the blower is not working as it should, the amount of heat transferred from the unit into your home may be reduced. A malfunctioning blower can also cause high-limit switches to trip and error codes. If the fan has been cleaned thoroughly and is not moving the same volume of air as it once did, it may need to be replaced.