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ProFitness APTV2 (or TR807) error 4 and Instructions?

I'm getting error code E4 on a ProFitness APTV2 (alternative odel No TR807). Anybody know what the issue may be or have any instructions?
Richard, October 2010
my treadmill is getting error RU7 and error 7, my treadmill is a Pro Fitness Pro-Mo-Tion model

annette, May 2011