Error code E7 occurs when the treadmill experiences a runaway situation or otherwise senses that the speed is not under the control of the console. When the error occurs, you the console locks out and you cannot use the treadmill again until the console is reset. Resetting the console will not necessarily remedy the situation if the electronics are faulty; in that case, the console needs to be replaced. But before you have the console replaced, you can try to reset the console yourself and hope that the error will not recur.
To reset the console:
1. Press and HOLD the MODE and STOP buttons while simultaneously turning the power off by removing the Safety Key.
2. Continue to hold MODE and STOP and replace the Safety Key. The console will beep.
3. Press Speed up ONE time.
4. Release all buttons.
Hope you find this useful.
Rodger Ellis, April 2009