Chosen Solution
My NordicTrack treadmill will power up and start fine but after 2 seconds the belt stops moving. The display is on but will not respond when I push the buttons. Once I power off and on it will again start but only runs for two seconds. I have checked the magnetic speed sensor and that is fine. I have also checked all the connections. When I look at the motor control board the red light is on u til the belt moves, then it blinks and goes back to solid red once it stops. Do you think the control board could be bad? Update (03/12/2021) The model is a elite 9500.
Its a power supply failure
Might be a failure with the power supply, but what I would do is take a look inside and compare it to images online and see if anything looks different than a regular one. Might be some loose plugs inside, I had this issue once with a different brand, and it was a loose plug inside that caused the problem.
