Prominent "FORBID WORKING EMPTY" warning label on the stainless steel casing, operating the pump out of water will quickly overheat and destroy the internal seals and motor.Phase Wiring Realignment: The label points out "PAY MORE ATTENTION TO (U, V, W)". These represent the three-phase DC motor wires. Ensure they are hooked up to the corresponding U, V, and W terminals on the bottom of the controller box. If the pump runs backward (delivering very low flow), you just need to swap any two of these three wires.Controller Placement: Keep the white MPPT controller box mounted vertically and shielded from direct rainfall and harsh midday sunlight to prevent thermal throttling.