The convection fan blade nut works in conjunction with the convection fan motor. The fan blade attaches to the convection motor shaft and the blade nut secures the blade to the motor. Make sure the blade nut is properly attached and secured. If the part is damaged, worn or won’t tighten you will need to replace it. Please remember to disconnect the power to the oven before starting your repair. This is a genuine OEM part which is sold individually.