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Treadmill – Lower control board failures. The most common reason for a treadmill lower board to fail is excessive stress. Usually the running belt gets worn down on its underside. The worn belt rotating around creates a larger amount of friction. The extra friction causes the treadmill to ask for more electricity from the wall to turn the belt. The lower board is not meant to handle this excess of electricity. As the board gets stressed over time it will either not accept electricity at all or it will present errors and abnormal functions until it overloads. So when a treadmill board fails, it might not be the only part that needs to be replaced to prevent the same problem from happening again. If you only replace the lower board and leave the bad running belt, the lower board will fail sooner because you did not address the root of the problem.