Hello, and thanks for your question! My name is XXXXX XXXXX Im happy to assist you today!!
It sounds like the speed sensor is bad or the mail control board is bad.
How old is the machine and how often do you use it??
LOL, sorry about that, Main board. The speed controller is not concidered a user replacable part by most manufacturers.
The thing I would try before before you replace anything else would be the tread deck and see if it is worn and not letting the tread/belt slide easy. If this happens then the motor thinks the belt is moving slower because of the drag on it and then speeds up to compensate for it. this will eventually wear out the machine and controller because the motor is working WAY more that it should be. I would limit your use or stop all use till its repaired so you dont damage it to the point of making a small repair bigger.
I would have it serviced (tuneup) as they say and let the tech check it out closer so you dont have to keep replacing more parts.
But I am sure that is the issue. The service cost should be very minimal and they will also double check the whole machine for you.
I hope this helps answer your question, if so please click the green accept button, if not im still here to assist you.
Thank you for your answer Charles. The deck has been oiled and that didn't fix the problem. My only problem is that I live in an area where I don't have a technician to come and look at my treadmill. Is it my understanding that I can't get a new sensor for my treadmill?
Yes, you can still get parts for them.
Here is website where you can get the parts for your treadmill.
I just looked and they carry allot of the parts you will need.
I hope this helps you out!!