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This might be in part due to age of machine (undisclosed) and tension on the belt you run/walk on maybe too loose as these like many items of same material under tension stretch and it is probably a failsafe mechanism to prevent personal injury. Unplug unit and remove covers (Warning! You may be exposed to electrical shock opening the unit/voiding warranty of the treadmill. There should be a tensioning unit that is adjustable and correcting tension may help solve this issue. This may take awhile after the repair to clear from the system to allow the unit to function properly again.
the service manual will be difficult tha you reach by free, However you can go to www. treadmilldoctor.com or www. treadmillrepairparts.com
and try it.
adjust the Speed sensor, see the diagram, clean it, test for open or faulty, and tight the connector very well. Lube the deck belt, see the video, lube the rollers bearing front+back too , test the drive belt motor and replace the belt if necessary. God bless you However you must try to Run the software calibration after your fix it.
If it reaches 250km then I suspect that the upper electronics is not functioning properly contact the distributor of Stex and If under warranty they sould cover it,but send out a servicer
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