Hey Samual! Let me help you here. The cooling fan is designed to cool down the oven's internal when it reaches a temperature higher than 280 °F, so this operation is normal. If you consider that this action is caused by an irregular operation of your range, feel free to contact us through our social media platform: Facebook Messenger: http://m.me/samsungsupport
Twitter: https://twitter.com/messages/compose?recipient_id=18768513
Or give us a call toll-free at 1-800-SAMSUNG.
^Rafael