Kessel Aquapump Small Instructions De Pose Et D'utilisation page 79

The functional check is successful if the following procedures
are carried out as described:
Level alarm is triggered, the alarm LED (2) flashes red, a
signal tone is generated and the wastewater pump starts
to empty the system tank.
After reducing the level below the alarm threshold, the
alarm LED (2) extinguishes and the two orange LEDs
(level (3) and pump operation (4) / (5)) illuminate until the
system tank has been emptied by the wastewater pump.
Visual inspection:
Once the wastewater pump has stopped running, only a
few centimetres of water should be left in the system tank.
Fasten the cover plate back onto the system.
The system is ready for operation
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