I would suggest verifying 6 volts output from the battery. From there, check the reed switch connection on the power control board. Also verify the gap between the reed switch and the magnet on the pulley. It needs to be close enough to the magnet to get a good reading. I am attaching a link to a video that shows the reed switch replacement procedure. You can see the magnet and also the slots in the reed switch that allow the adjustment. LifeFitness 95Xi Crosstrainer Video Reed Switch Replacement Speed Sensor
The battery is located in the front of the rear drive mechanism. It is mounted just below the alternator control board. The following video shows the battery location along with the battery replacement procedure.
Battery 6 Volt 2 5 Amp Hr LifeFitness 0017 00003 0685 SPORTSMITH net
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