Response to Hi, Jeff. Yes, you can convert your single speed pump to a variable speed using the PL1116 or ECM16CU motors. You will also need the Super Pump Tune Up Kit - GOKIT3 or GOKIT3SALT. It is hard to say if its a fluke or not without knowing what caused the motor lock up. The motor part numbers are hyperlinked so you click it to see the price and availability. 

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