The motor control board would be faulty.
If you wish to get some details about treadmill repair ; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/
SOURCE: Nordictrack motor will not run when start button is pushed.
Likely the cover of one of the motor brushes popped off. Unplug the machine before you pop it back in place, then try it again.
If that doesn't work, most likely it's the motor control board, or possibly the console, or finally just a loose connection behind the console.
But most likely, it's the motor brush cover. I've been seeing that alot with this model.
SOURCE: Nordictrack EXP1000i stopped in the middle of program
Your drive motor is over heating. Usually caused by friction from the walk belt. The belt needs to be lubricated. (silicone only) Loosen the adjusting screws on the rear of the macine ten revolutions lift up the belt and using a spray silicone lubricant (from any big retailer) spray a light film on the deck (walk board). Retighten the adjusting bolts ten revolutions. If this does not help I would suggest replacing the walk belt. Good Luck, Tim
SOURCE: I have a NordicTrack c2200. I find that the tread
There are a couple possibilities.
Remove the motor cover and run the machine.
Check the tension of the motor belt. It may need to be tightened. 
Check that the pulley has not broken free from the front roller by stopping the walking belt when the machine is running. If the belt stops, but the motor and pulley keep turning, the pulley has broken free from the front roller.
If this is the case, with a drill and small drill bit, drill a hole through the pulley and roller on the inside edge of the pulley, between the ribs (not where the motor belt travels) and put a screw through the plastic into the metal roller.
Otherwise, change the roller.
Good Luck.
SOURCE: tr2 motor will not run,used 24v battery to test motor,runs ok.what could it be
Dear Sir:
Try to run the software calibration for easy diagnose and troubleshootin.
See my personal TIPS FOR HELP.
However the main motor board 2) main motor can be faulty.
measure the input voltage to the main transformer. 2) measure the output from the main motor board.
sincerely. God bless you
SOURCE: treadmill nordictrack c 1900 motor doesn't run, belt doesn't turn
1) Lube the deck belt, in according with the instruction manual.
2) Lube the rollers bearing, with the i. manual
3) Test the input voltage motor, if there are the motor need repair
4) Test the output voltage board, for input voltage motor, if there are Not the board is faulty. God bless you
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