Hi
Looseness or discolorations of the prongs on the plug or the terminals in the wall or extension indicate a weak connection. A weak connection lowers the voltage to the treadmill and causes the motor to work harder. With low voltage the motor draws more amperage and causes the circuit breaker in the treadmill to trip.
Another cause for circuit breakers to trip is the belt needs lubrication. Check for belt lubrication and ease of movement. To test the walking belt lubrication, do not turn the treadmill motor on. Set the elevation to the highest level. Stand near the front of the walking belt. Push yourself firmly toward the rear of the treadmill. If the belt is properly lubricated the belt will take you to the rear edge of the treadmill and dump you off on the floor. If you move and stop, the belt needs lubricating.
Also check this related link:-
http://www.livestrong.com/article/404896-my-proform-treadmill-wont-start/
Please get back to us if you have further query else please accept the suggestion.
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