Hello. Thank you for your inquiry.
The reason that your treadmill is tripping the breaker is because you are experiencing "belt-to-deck friction." In other words, your walking belt (the belt that you walk on) and the walk deck mylar (plastic sheath attached to the wooden plank that the belt rolls over--look underneath the walk belt) are both worn out. There is nothing that you have done wrong nor is the treadmill defective. This is something that happens to all treadmills over time regardless of the price range, model, or brand. Think of it as the "tires" on your car going completely bald, from so much wear.
So you essentially have a bare piece of wood rubbing on a worn piece of plastic(mylar sheath). This causes the belt do drag. The treadmill automatically pulls more power from your wall, to compensate. Therefore, your breaker goes out.
The only way to prevent this (and it is necessary, because your treadmill controller could burn out next), is to essentially replace the "tires." In other words, a new walk belt and a new mylar fix kit (luckily for you you don't need a new walk deck---only the mylar kit--cheaper). If you can install them yourself, you'd be golden. If you have to get them installed, it'll run you about $120 plus the cost of the parts.
Here are the parts you need, and where to get them. This way, you can compare the price of repair vs, the price of a new one. My honest opinion, the older units are high quality units. The ones made 5 years and newer (proform) are junk, I would repair it if I was you.
- For questions about parts, service, user's manuals or non-working products, please call our ProForm Customer Service Department at 1-888-533-1333.