I don't know what kind of off brand pump it is but I have always been able to switch from high off low using a rocker switch on the wall. I was showing the new home owner how to operate the spa and water features when the high speed setting gave a buzz at the pump and that was it. It still works on slow speed. They want to attempt to repair it themselves before buying a new pump. Is it a matter of trying to change the capacitor(S) or would a new motor be required? It's a century 2.2HP motor.