The issue where it is not detecting a runner is probably a simple wiring issue. There is a wire that goes from a censor under the deck to the controller, make sure that wire is connected and test it for continuity. If the wire and censor are good then it's probably the controller, but that is unlikely. The other issue sounds like an upper board issue. If you could post a photo of the screen I could give you more help.
SOURCE: Tread Mill Skips Jerks Every So Often
Your treadmill is trying to tell you its due for a tune-up!
SOURCE: NO I WOULD LIKE A OPERATOR'S MANUAL FOR A
Here is a link to ProForm for 293250 manual download.
http://www.iconservice.com/cgi-bin/ncommerce3/ExecMacro/proform/manuals.d2w/report?name=293250&match=exact&lan=
Just right click on the file and select 'save as'. You will need Adobe Reader to view once downloaded, and it's at no charge.
SOURCE: my tread mill looses speed during my workout. the
If you haven't adjusted the belt refer to your owners manual for the proper procedure if you still have the same results then it could be caused by a lack of lubrication under belt or a worn belt.
SOURCE: Stuck Key Error Message on Life Fitness F3
Stuck Key means one keys on the function pad assembly has failed and will need to be replaced. Call Life Fitness @ 800-351-3737
SOURCE: life fitness treadmill display: transistor error-won't run
This error shows up if motor controller detects a failed part. This isn’t a reset-able error. Treadmill will not allow workouts until serviced.
Solution
Main motor wires/leads could be disconnected at the start of a workout. If the motor is properly connected and in working condition then the drive transistor could have failed. Check Motor Controller.
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