LifeFitness 9000HR Midline and T9i Treadmill Start Up Error Paul Anderson Updated October 22, 2021 21:57 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 the disk. Replace if any broken or damaged wires.
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