Hello and thank you for choosing Just answer. My name is ***** ***** I will be attempting to answer your question today.
How long have you had this treadmill?
Have you ever had problems in the past with this treadmill?
Did you buy this new? Or did you buy it used?
From WHERE did you purchase it?
Lastly, do you have the original owners manual?
So, its an older treadmill......there could any number of things. If the board was replaced once....it could ned to be replaced once again. Unfortuneately, with an older machine that has no manual, has been repaired, and has been used in a commercial setting...i can only suggest probable fixes, and then you would need to carry them out. Here at justanswer, we dont stock parts unfortunately. My suggestion to you is to, try to repair the board once again.
Yes, try to replace the board once again.....and that should do it....What you were explaining was really odd....which would lead me to think that the internal elctronics controller (the main board) is acting up, and going bad.
Good Luck. And if it works....dont forget to Rate my performance.