This is indication Powerfully that Main controller Drive Board is demanding Enough Current .
This indicate 1) walking belt is worn or 2) the drive motor brushes are worn.
3)Leaky filter capacitor 4) inductor or coil faulty.
You must use A clamp-on ammeter for determine the amount of A.C. input current being drawn by the treadmill under Load and Not Load.
See the Block diagram for knowledge how the main controller board has aprox 90% of function of the treadmills. Good luck.
Now you will have the Strong Results for trouble what is wrong!.
This block I did for Motivation Troubleshooting.
E.CUADR
MANAGUA, NICARAGUA. C.A.
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