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Sometimes incline motors will get frozen in position and need broke free. To do this, try the following:
Take the motor cover off and take the screw out of the bottom of the incline motor that is attached to the screw assembly. Once you remove the screw you should be able to break the incline motor free.
Run the incline up and down with the screw still off (laying the treadmill on its side may make this easier). Once it goes up and down (hold the screw so it goes in and out) reattach it then run the calibration as you described previously. If it was just stuck it should now work fine:)
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