The technical information for this treadmill is shown in the images below. You could have a problem with the console, the motor controller or the wiring that could cause this problem. A technician would use the information shown below to diagnose this problem. Check the LED's on the motor controller to help you determine the cause of the problem as described below. NOTE: Be sure that you
unplug the treadmill
when accessing internal components. When you need to plug the treadmill in to observe lights and conduct voltage checks, use extreme care not to make contact with live wires and contacts.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services