Potential 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)
Important!
Before use, read the instructions and the labelling on the descaler pack.
You should use De'Longhi descaler only. Using unsuitable descaler and/or performing descaling incorrectly may result in faults not covered by the manufacturer's guarantee.
and deliver around 1/4 of the solution in the tank.
and deliver water from the cappuccino maker.
Then turn the dial to the I position to stop the flow and let the solution work for 5 minutes.
Repeat the above mentioned process 3 more times until the tank is empty.
and deliver water until the tank is empty.
and deliver water until the tank is empty.
The machine is now ready for use.