Your Problem: jazfit-750 Treadmill motor will not turn on

SOURCE: Your Problem: Spirit Treadmill motor will not turn on

I'd start by attaching a voltmeter across the motor contacts to see if you get any voltage when the unit is turned on. It's probably an AC motor but I'd check the label to be sure. If you get voltage but no turning either the motor or a startup capacitor is bad. If this is the case try moving the tread by hand with the unit turned on. If it moves on it's own after you start it moving then the start up cap needs to be replaced. Otherwise it may be time to replace the motor. If you don't have voltage across the motor contacts when the machine is turned on, I'd unplug the unit and trace the lines back from the motor to somewhere on the PC board. I'm guessing there's probably a relay on the PC board that controls the motor. I'd use an ohm meter to make sure the relay coil hasn't turned into an open circuit. Next I'd put a voltmeter across the relay coil, plug the unit back in, and turn the treadmill on and off several times. Ideally you should see the voltage across the relay coil go up and down as you turn the treadmill on and off. This voltage could be AC or DC depending on the type of relay used. If you get the proper voltage across the coil but the relay contacts aren’t' opening and closing to provide power to the motor then you need to replace the relay. If you don't get the proper voltage across the relay coil the problem is further back on the PC board.