MSW Motor Technics MSW-M-LP-ABP-800 Manual De Instrucciones página 31

Check that there is nothing loose or moving in
the bilge to interfere with the float's
movement. Remove everything loose/moving
from the bilge or guard off the float's location.
The electrical field switch sensor is too close
to piping, the boat's structure, or another
object with a high mass. Relocate the pump.
If the sensor is dirty, clean it.