You can purchase a new heating element part # 990050051 either from Masterbuilt or from Factory Appliance Parts http://www.appliancefactoryparts.com/gasgrillparts/brands/masterbuilt/
If they are still available. All of Masterbuilt's electric smokers have been plagued with electrical problems.. It's either the element or the electronic controller on the top of the smoker, that constantly fail.
Hope this helped you and thanks for choosing FixYa.