Your problem might be that a magnet has fallen off. Here's an illustrated guide that should make fixing it easy: http://fixmytreadmill.blogspot.com/2010/10/how-to-fix-treadmill-e1-error.html
Good luck.
J.lam
October 2010
Automatic Answer
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howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix gym/fitness equipment.