When do I need to clean or replace the sensors, and how do I clean them?
To clean the sensors, disconnect the connectors from the control cabinet, unscrew the sensors and remove them carefully. Clean the white ring at the bottom with a soft toothbrush and ordinary toothpaste or washing-up liquid for household use. Rinse the sensor off with freshwater, put the Teflon tape back on the screw’s thread and return the sensors to their places.