1. Go to LEVEL settings page, select unused control circuit, set function to LEAKAGE DETECTION, select Sensor 3.
2. Go to SWITCH CHANNELS page, select outlet that has return pump connected, set function to FILL WATER, select the control circuit number you used in step 1.

By default, this socket will stay ON.
If water level triggers the float sensor, the assigned socket will turn OFF and an alarm will be activated.

More information on this can be found in our P4 Resource Guide:
See Leakage Detection
https://www.aquariumcomputer.com/dow...esource-guide/

NOTE
It is only possible to assign a single sensor to ATO/AWC task.