My proform 515s Crosswalk treadmill works for a few minutes, then the belt stops moving. The lights are still on, the timer still running, the distance still accumulating. It was running flat, no incline, so we increased the incline and it worked fine for the rest of the workout. What could be the problem and how do I fix it?

1. Inspect belt and deck. The deck should be smooth. The belt should have a consistent feel from side to side (a belt can be worn out without any sensory signs of a problem). If you feel deep grooves in the deck or uneven wear on the underside of the belt, part replacement is necessary. Continued use of your treadmill may damage expensive electrical components. 2. To inspect the belt and deck visually or to clean underneath the belt before applying lubricant, the belt must have the tension reduced. Loosen the tension roller by following the instructions in your owner’s manual. Do not loosen the bolts in the tension roller too far or the bolts will come out of the roller shaft. This step may not be necessary for your treadmill model or belt and deck condition. 3. Contaminants are the worst enemy of your belt and deck. Some treadmills may have an excessive accumulation of dirt and contaminants. If these are trapped during the belt lube process, significant damage will occur. If contaminant removal is necessary, loosen the belt by following step 2, lay the treadmill on its’ side, and use a nylon brush to loosen contaminants that have accumulated on the inside of the belt. Clean the deck with mineral spirits in a well-ventilated area. Allow the deck to dry before lubing or tightening the belt. 4. After completing the steps above go to your local hardware store and purchase a can of silicone spray ( Pyroil, Napa etc ) attach the nozzle and proceed to spray length wise starting at the motor shroud to 2/3 down the deck repeat the process on the other side then re-tension the belt according to you owner's manual. Start unit and proceed to walk on it if the unit shuts down again then belt and deck needs to be replaced or your in the market for a new treadmill.