ProductCombi coffee maker COM530The drip or espresso coffee has an acid flavour
Combi coffee maker COM530

The drip or espresso coffee has an acid flavour

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After descaling, make sure to thoroughly rinse the espresso unit

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)

Rinse as specified in this step-by-step guide: