Different reasons :
- batteries are full and the hydro is freewheeling. It generates a roar. (The hydro has to be lift up when the batteries are full) Color code : light purple + long green flash
- One phase is damaged or disconnecter on the cable. (color code : light purple + 2 red flashes or red fade-in-fade-out)
- the converter is disconnected (color code : light purple + long green flash)
The hydro is doing some noise (roar), why ?
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