Full submersion of motor in water could easily ruin the start switch. It is best to do this before rust forms in the rotor cavity. ASAP Take off the 2 front end plates. Then with an allen wrench remove the rotor ring. Now your task is to sand or buff ALL the visible rust. If the rotor is seized use bearing solvent to help loosen it so it turns. Test run the pump to see if electronics are okay.. If the rotor has extensive rust the vanes will likely need to be broken to get them out of the slots. If any vanes are broken get a rebuild kit with new vanes, Orings and filters. Reassemble.


aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management