E21or E2 1 means the treadmill is not picking up a speed signal once the start key is pressed. First, determine if the motor is turning before you get the E2 1 or not. If the motor turns, the speed sensor is the most likely problem. If it does not, you can manually turn the belt with your feet before you get the E2 1 and you should get a speed reading but eventually you will get an error code because it is almost impossible to keep the speed constant enough for the computer. Try running it through calibration with the motor cover removed. their is Tech sheet under the hood and it will explain how to do the calibration
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