You most likey reversed the wires or you hooked up the sand filter pipes backwards try reversing the pipes on the pump first. If that does not work try reversing the wires, however you will have to flush the pump before using again or you will damage the pump
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You most likey reversed the wires or you hooked up the sand filter pipes backwards try reversing the pipes on the pump first. If that does not work try reversing the wires, however you will have to flush the pump before using again or you will damage the pump