... the front panel (up key), the red button (down key), can be within 0-450 °C to regulate ... front panel buttons (up key), the red button (down key), in the range of 0-450 °C, ... turn off the power switch, so that whole cool down and then power off.iii. Preheating temperature settings recommended ... , do not immediately power off until the machine cool down before you turn off the power.2. To maintain ...