It is likely that the console will need to be replaced - a common fault on these treadmills.
If you have some experience in this type of repair, you can obtain a console and fit it yourself;
otherwise let me know your ZIP code and I can advise on a repairer in your area.
In the Uniontown area, you can contact :
Health & Fitness Equipment Ctr.
Northcoast Fitness Tech
3675 State Route 303 Ravenna, OH 44266