dead short in the motor or system
you have 2 options
get in an electrician to find/ fix the short
junk it as too expensive to repair
you have no options in using it until it is fixed as the unit could become alive and electrocute a person
The Motor control Board is faulty. Also you have to check the carbon brush of the Motor .
If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/
If you wish to get some details; check the site http://electro-medical.blogspot.com/. Pull up older posts. Surf the site with patience. Check for treadmill error codes