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?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix gym/fitness equipment.