Replaced switch and potentiometer
If you replaced and wired up the switch and potentiometer correctly and the new parts are not faulty that only leaves the Printed Circuit Board as the cause of the problem, it won't be the motor.
Ross I replaced the potentiometer on my Vitamix however the blender still only runs on high. Can you replace the circuit board yourself? Where do you purchase?
Look at this link, by pausing the video it may help you confirm you have wired what you have done correctly. If what you have done is correct then that only leaves a faulty new potentiometer or the PCB
https://onedrive.live.com/redir?resid=66...
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