ProductDistintaThe coffee has an acidic taste
Distinta

The coffee has an acidic taste

Try this solution

After descaling rinse the appliance as indicated in the descaling guide below

Possible cause:
Inadequate rinsing after descaling.

Do you need descaler? Delonghi's EcoDecalk has been specifically designed with your machine in mind. Using this descaler regularly will prolong the lifespan of your machine and keep it running at optimal performance.

De'Longhi Coffee Machine Descaler EcoDecalk 500ml Best Value Pack (delonghi.com)