DIAGNOSIS Error E02 indicates a boiler refill timeout. The machine did not detect water entering the boiler within the expected time after a brew cycle request.
FIX This is typically a water supply chain blockage. Check three points in order: 1) Ensure the water tank is full and correctly seated. 2) Check the tank outlet for scale or debris. 3) Descale the machine using the integrated program (Menu > Settings > Maintenance > Descaling). Follow the on-screen prompts precisely with De'Longhi descaler.
IF THAT DIDN'T WORK A failing water pump or a blocked internal solenoid valve can cause E02. Listen for a humming sound from the rear when you request hot water. No hum suggests pump failure.
HEADS UP Repeatedly triggering E02 can overheat the boiler's heating element. Allow the machine to cool for 30 minutes before attempting the descale cycle.