Treadmill will not maintain the correct speed.

Make sure you recalibrate your treadmill after installing ANY controller, motor or console. You can NOT over calibrate your treadmill. You want to make sure you adjust your pedometer for the correct operating speed and incline adjustment. First plug in your treadmill, do not stand on the walking belt. Hold down the "Stop" and "Speed +" key and insert the safety key or magnet, let go of the two keys. Now press "Stop" key once. This puts you into the level 2 of calibration. Press the "Speed +" key slowly until you see 85 on the console, (at this point the display is going to show the percentage of motor usage and also the actual walking belt speed) at 85% motor usage your top speed should be between 10 and 10.5 MPH or (of 12 and 12.5) depending on the treadmill. You must know your treadmills top speed. (Important the motor may be damaged if you set the maximum speed higher than the maximum speed that your treadmill is made for). If the speed is higher than 10.5 or 12.5 then you need to turn the potentiometer down to the correct level. The adjustment is made with a phillips screwdriver, and the adjustment point is on the motor controller. It is a little square metal box with a yellow plastic adjustment screw inside. If the speed it to low you need to turn the potentiometer higher. Once the speed is correct you are done calibrating the speed. Press the (-) speed key to lower the percentage to (0). Next press the incline (+) button, this will make the incline motor go all the way to the maximum incline and come all the way down to the level position. Then remove the safety key and the treadmill will reset into the normal manual mode. Double check that the treadmill is operating at the correct speed and incline motor works correctly, by running maximum settings. Once you are done, be sure your treadmill is properly protected from surges from power spikes that can destroy the work you just performed.

Hope this helped.