SOURCE: I bought a used Life Fitness 95T from a fitness
If the console takesbatteries, replace them. If this does not work or your console does not requirebatteries, check the reed switch or optic sensor. Reed Switch:Unplug the treadmill and remove the motor hood cover. The reed switch is mountedon the frame next to the front roller pulley. There is a magnet glued into thefront roller pulley. When adjusting the reed switch, make sure it is pointingdirectly at the magnet. Move the tip of the reed switch within 1/8" of themagnet. Also, check to see that the wire is not damaged, and is connected tothe console. 
Then tight the flexible cords from keypanel vs display board( clean the keypane with spray from contact cleaner. then tight the connector from display board vs main motor controller. Remember the main motor controller has aprox 90% of functions of any treadmills. See the block diagram that I did for people like you, And now you will get powerful strong resultant what is wrong. sincerely. Good luck.
finally 2 options: 1) display faulty 2) Main motor controller of course after you did the first step.
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