Please attach a photo of the wire so I may see?
In the meantime you could also try recalibrating the incline system:
With the key in the console, press one of the Incline buttons. While the incline is changing, remove the key. After a few seconds, re-insert the key. The treadmill will automatically rise to the maximum incline level and then return to the minimum level. This will recalibrate the incline system.