you have 2 options:1( buy it from www.fitnessrepairparts.com 2( or buy it from home depot. Remember the start key is small magnet, very simple.God bless you
Read your instruction manual, section troubleshooting for indication.However you must adjut THE reed switch, see the diagram attached, clean, and tigh the connector wires very well. God bless you.Run the software calibration for diagnose, and troubleshooting too.