What model is it?
SOURCE: Every motorized treadmill must need some regular
The main thing to do is keep the walk belt area clean of all shoe rubber and lint,vacuum the tread melt and edges regularly.Most treadmills have a wax lubricant in the walk belt,youcan purchase this lubricant at store that sell treadmills or you can do an on line search for treadmill lubricant.If you lift the belt and feel under the platform you should feel a slight waxy film, if not you should add wax as needed,some wax kits come with instructions, but if you just apply it to the platform area underneath the walk belt where you feet normally land when to step forward that should be fine,walk on the treadmill for a few minutes to spread the wax evenly on the underside of the belt, other than that there is no other maintenance needed.
SOURCE: Life Fitness T3 treadmill won't turn on. Power
Could be. If you had to take it apart, I would definately check the wire harness connection. Also if there are bolts that were removed, check to make sure none of those pinched the harness when reassembling.
SOURCE: I have a proform j8li treadmill, all 4 led lights
I have the exact same problem with the very same treadmill that i bouth 10 years ago and it has been sitting for 5 years unused. The last time it was turned on it worked but now that I plug it in and try to start it, everything works but the belt drive motor. Any ideas?
SOURCE: Burning smell from treadmill
Get a hold of National Gym Supply @ 1-800-496-7278 They can either repair or exchange the board
SOURCE: I left the red key in epic view 550 for 1 full
Check the reset/off circuit breaker located on the treadmill frame near the power cord. If the switch protrudes as shown, the circuit breaker has tripped. To reset the circuit breaker, wait for five minutes and then press the switch to the reset position.
Optic Sensor: Unplug the treadmill and remove the motor hood cover. The optic diskand sensor are located either at the end of the motor or the right hand side ofthe front roller. The optic disk spins between two sensors on the optic switch.The disk must spin freely without touching either sensor. The sensors can bemoved by loosening the adjustment bolt holding the switch to its bracket. Theswitch can then be slid. Center the disk. 
Good luck. sincerelyOptic Sensor: Unplug the treadmill and remove the motor hood cover. The optic diskand sensor are located either at the end of the motor or the right hand side ofthe front roller. The optic disk spins between two sensors on the optic switch.The disk must spin freely without touching either sensor. The sensors can bemoved by loosening the adjustment bolt holding the switch to its bracket. Theswitch can then be slid. Center the disk. 
Double check that all connections are secure, especially the console cable. Unplug and reconnect the console cable to verify.
Make sure the console cable is not pinched or damaged in any way.
Turn the power off, unplug the power cable and wait 60 seconds. Remove the motor cover. Wait until all red LED lights have gone off on the motor control board before proceeding. Next, verify that none of the wires connected to the lower board are loose or disconnected.
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