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3 If the treadmill still will not operate, please call Keys Technical Service at (888) 340-0482. Treadmill walking belt slows during use. 1 Check to make sure the treadmill is securely plugged into an UL-listed surge protector, rated at 15 amps, with a 14-gauge cord of five feet or less and the surge protector is securely plugged into the outlet. 2 If treadmill still will not operate, please call Keys Technical Service at (888) 340-0482. Treadmill walking belt slips or is not centered on rear ro