Error 1 means belt didn't start (or no speed sense).
Speed sensor and motor brushes are usually the culprit. Most of the time this its just the speed senor is out of place. Remove the hood and next to the pulley on the front roller you'll see a little black pill with wire attached. Adjust the tip of that to where its sitting within about an 1/8 inch from the magnet on the pulley. Speed sensor can go bad and you can tell by using a voltage meter on the audible continuity setting. New speed sensor: Cybex CX 445T Speed Sensor Part # AX 21500
If that doesn't work check your motor brushes, continuity on communication cables and calibrate it. If that doesn't work you may have a much larger problem such as a bad motor. How to test your motor
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