Bialetti SMART CF65E Instructions For Use Manual page 40

EN
Fill the tank with clean water up to the "MAX" level and insert it in
K)
its seat.
Start the cleaning mode using the pour button for 5 seconds until
L)
the tank is completely empty. If necessary, start the cleaning mode
several times (the machine features a safety system, which interrupts
the dispensing automatically after 100 operating seconds).
Repeat the steps described in point L).
M)
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7. Maintenance