How can I fix my treadmill?

i have a Gym Gold 450 Treadmill the incline on it is is supposed to automatic when yo press the inlcine button however it will not work I put the inlcine on manually at the higest level but it will on hold when I turn on the machine it just automatically reverts to the zero position . You can press the incline button forvever but will not work the incline motor is working beacuse you can hear it cut in Can I fix this