Red descale light is on

I use distilled white vinegar, but you can use specialized coffee cleaners with this model:

Descaling
Descaling 11
Descale your Tassimo machine every three months to keep it
operating at full potential.
1 Descaling products are widely available from stores selling coffeemakers and espresso
machines. Only use a product intended for descaling. Mix the descaling product
directly in the water container, following the instructions provided on the descaling
packaging. Replace the water container on the machine.
2 Place a large cup or mug on the cup stand, insert the cleaning disc, bar code down,
and close the brew mechanism. When the AUTO light illuminates, press and release
the start/stop button. The brew cycle will fill the machine with descaling solution. Empty
the cup and let the machine stand for 15 minutes.
3 Open the brew mechanism and close it again, leaving the cleaning disc in place.
When the AUTO light illuminates, press and release the start/stop button. When the
machine stops running, empty the cup, and let the machine stand for 15 minutes.
Repeat this step two more times for maximum descaling effectiveness. Discard the
remaining descaling agent from the water container, rinse it thoroughly and refill
with fresh, cold water.
4 Open and close the brew mechanism again, leaving the cleaning disc in place.
When the AUTO light illuminates, press and hold the start/stop button to flush water
through the machine. The MANUAL light will flash. When the cup is full, release the
start/stop button, empty the cup, and replace it on the cup stand.
5 Repeat step 4, flushing clean water through the machine in the same manner and
emptying the cup as it fills. To ensure that all the descaling solution is completely rinsed
away, flush two full water containers through the machine before using it again.

Have done first de-scale as per manual. red light still on.