E7 indicates a possible fault with the incline.
To fix this, press the Stop and Incline(up) buttons together and hold them in for 20 seconds.
Your treadmill should start to incline upwards. Once fully up, take out the safety key and restart the treadmill. Now put the safety key back in and the problem should be fixed.
If you keep getting error 7 even after performing the reset I mentioned then there is likely a fault with the incline mechanism and it will require a repair.
Let me know your zip code and I can advise on your nearest repairer.
In your area, you can contact ClubCare Inc:
431 N Buchanan Cir, Pacheco.Tel:(###) ###-####/p>