If its fitted with a LT 200 controller it could be 1 of 3 issues
1: Remove drive card and clean the two shunt wires connected to the bus bar and resolder internally to the board.Make sure you dont fit them back the wrong wayon ther bus bar when rebuilding.
2: Controller may need reprogramming but to do this you need a LT200 box
3: Faulty controller so you need to send it away for repair.
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