treadmill shuts down and displays "PO" on the control panel?
I have a Pro-Form SpaceSaver 730 SI. I've had two different things happen. It will shut down while using it and the panel displays "PO". Also, I had it speed up uncontrollably while walking on it. Usually it shuts down. I've only had it speed up once. Can you narrow it down to a part with those symptoms?
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