hillvert HT-ROBSON-SP1100-93 Manuel D'utilisation page 22

The device starts but does
not pump / pumps only a
little water
EN
Water feed clogged
Leaking water connections
Insufficient water level in the borewell
Water delivery head too height
Remove the blockage.
Seal the connections.
Check the water level. The
pump should be at least 2 m
below the water surface.
Install the pump in accordance
with its technical specification.