The double flashing of the BOLD light means the drip side of the unit require to be descale. To descale it please follow the steps:

1) Remove the anti chlorine filter and pour 100 mL (3.3 oz)  of descaler into the tank;
2) Fill the tank with water up to the “max” level for the correct dilution;
3) Place the carafe on the warming plate;
4) Press and hold the “BOLD” touch icon for at least 6 seconds to start the descaling” cycle.
5) During the descaling cycle the “BOLD“ led will blink. The clock will switch to a countdown (27 min) during the process and will blink until the end of descaling.
6) Rinse at least 3 times by operating the machine with water only