If only the light of the three preset buttons are flashing, the blender is on standby mode. You can press any preset buttons or turn the rotary knob from MIN to MAX to start blending.
If the light of the rotary knob and the three preset buttons are flashing, error happen on the blender. You need to turn the rotary knob to “OFF” to switch off the blender first. Then turn the rotary knob to “ON” and continue to use the blender.