The main objective of the furnace start-upFurnace start-up is to gradually heat, dry and expand the working liningLining to the extent that all the brick joints are closed before they are exposed to molten material. Once the bricks are considered tight under the electrodes, a molten bath can slowly be created and grown to normal operating levels. The major key consideration to achieve these goals is careful monitoring and controlling of temperature rise rates within defined rates. The heat up process can be divided into 4 phases: burner refractoryRefractory preheat or dry out, electrical refractoryRefractory preheat, molten bath formation and hearth expansionExpansion stabilization and electric ramp up to name plate. The control and operation of the furnace vary for each phase, and the decisions to switch from one phase to the next are made based on continuous observations of conditions in the furnace (via monitoring of temperature, bath level and expansionExpansion). This paper offers detailed guidelines for the heat up process of electric arc furnacesElectric arc furnaces, but it cannot address every potential issue that may arise. Some challenges may be specific to individual start-ups. While it can serve as a foundation for developing a heat up manual, it should not be used as the sole reference for actual operations.