fix E1 alarm problem?

I go to start treadmill and it does not start. I hear a click and E1 appears. I can get it to start with multiple attempts and actually ran it yesterday at high speed. Today started out the same way. Set speed belt never moved even though it is free to move. Unit times out and alarm appeared.. If I keep trying it will eventually start maybe!!! It runs good and all functions work once belt starts moving..Please help!