De'Longhi ECAM 350.55B - Infuser Attachment Issue & Solution After Descaling Process

The discussion addresses the "attach the infuser" error on the De'Longhi ECAM 350.55B coffee machine occurring after descaling. The issue often relates to the brewing unit's position detection, primarily involving the Hall sensor and microswitches that monitor the brewer's movement. Replacing the Hall sensor alone does not resolve the problem because the machine's motherboard stores encoder step data, requiring a specific encoder reset procedure to synchronize the new sensor data. The reset is performed by entering a diagnostic test mode with the machine off but plugged in, trays removed, and pressing a combination of buttons (Rinsing, Aroma, Drink Menu, MyMenu) until "TEST MODE" appears, then reinserting trays and selecting the espresso icon to initiate the encoder reset. Mechanical causes include play or dirt in the brewing unit carriage, misaligned or unscrewed microswitches, or obstruction by coffee grounds preventing proper microswitch activation. A practical temporary fix involves gluing a small rubber spacer (e.g., from a bicycle inner tube) to the piston element that presses the upper microswitch to ensure contact, though this may indicate underlying drive wear requiring replacement of the main screw and nut. Users report that after reset and mechanical adjustments, the error can be cleared, but recurring faults may indicate progressive mechanical failure. Additional maintenance tips include cleaning the brewing unit, thermoblock strainer, and lubricating moving parts. Similar issues and reset procedures are noted for related De'Longhi models such as ECAM 23.450, Dinamica Plus, and Primadonna series. The discussion also highlights the importance of careful assembly, as overtightening the infuser can cause the error. Service manuals and reset instructions are shared via links and images to assist users in performing the encoder reset and troubleshooting the sensor and mechanical components.
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