chances are you will need a new fan motor assembly . to remove the motor you need to take out the oven from its housing remove the back and three screws (torx) hold it on. you can only remove it having taken off the fan blades inside the oven cavity first. fan motor part nos is probably 096825 at £72.85+carriage from appliance care ltd (08705543210) they will need the enr number of the oven which is on a sticker near the door seal . good luck
graham, May 2005