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What would cause my treadmill to increase the speed sometimes and then go back down and run normally?

I have a Proform treadmill model 831.297792. Could it be the controller part 24 or the magnet placement on the pulley or something else?

Treadmills , Body Building and Toning
1 Answer from this member:
by LYLE W. Earned 1,347 community points in Treadmills
October 14th, 2009
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