Start Up Error LifeFitness Midline Treadmill, 8500,9000, and 91Ti Paul Anderson Updated October 22, 2021 21:56 Share Probable Cause Opto Sensor (Speed Sensor). Corrective Action Check the Opto (speed) sensor connection and wires. Make sure the Opto (speed) sensor is evenly spaced over its disk. Replace if any broken or damaged wires.
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