A similar problem has occurred to me. I was doing a descaling this morning, which was not completed and the coffee machine continually reports that "the circuit is empty". I switched on "test mode" and did one by one as per @djszaman's instructions, but after inserting the grounds container and switching the coffee machine on, it again demands to fill the circuit and there is nothing more I can do. Does anyone have any ideas on this? I would like to get into test mode to test which component may be faulty. The model of the coffee machine is De'Longhi Dinamica 350.55B.
