Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
What happens when the machine stops - does it display an error code, or does the display go blank?
Ok, the speed sensor may have gotten knocked by the cloth and it is cutting out as a safety precaution.
You will need to check and adjust the speed sensor if necessary.
Let me know if that works?
It is also known as a reed switch, it is mounted near the motor and looks like this:
Have you tried testing the reed switch for continuity to see if it is working?
Ok, that is a good indication that the speed sensor is working.
Does the treadmill run ok if you are not standing on it?
Does the motor run when the belt is removed from it?
Can you measure the current drawn by the motor when it starts up?
If the motor has failed you will get a higher than usual draw of current, which may be causing the machine to go into a failsafe mode.
Ok, yes this does indicate that the motor is bad - it is unable to run, even with the belt removed.You can test it further by connecting a 18V cordless drill battery to the two power supply wires, however I do suspect that you will need to replace the motor at this stage.Pete.