Kessel Basic 230V Mono Instructions De Pose Et D'utilisation page 36

If manual operation is not used for a certain period of time
(5 minutes), the control unit reactivates automatic opera-
tion.
5.2 Automatic operation
The system is in automatic operation, if there are no errors
detected and the operating LED (1) is illuminated in green.
The wastewater pump is switched on and off in accordance
with the wastewater level.
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