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The mixture may be too thick. Turn off the machine and check the consistency; it is likely ready to be served.
Ensure the timer is turned past zero and the unit is plugged into a grounded outlet.
The manual explains several features that confuse new users:
Master the Churn: A Guide to the Lello Gelato Pro (Model 4070 The Lello Gelato Pro Model 4070 Go to product viewer dialog for this item.