Start the first rinsing cycle by pressing the 1-cup and the 2-cup buttons briefly at the same time.
Wait until the water tank is empty and the first rinsing cycle has finished.
The CALC light and the ON/OFF light will start to flash to indicate that the rinsing cycle has started.
When the first cycle is finished, the light ring around the ON/OFF button starts to flash rapidly.
The CALC light continues to blink slowly to indicate the total descaling procedure is still activated.