if you're getting an e2 warning or speed control issues with your sole treadmill one possible and luckily cheap fix is to check the speed control sensor under the protective cover near the motor. our treadmill was slowing down before speeding up and speeding up before slowing down and ultimately we got an e2 warning. when we get on and by pushing the sensor closer we fix the issue. this particular treadmill is a sole f85, but this fix could work on any model and probably any treadmill for that matter. all treadmills should have the sensor. they may just be tracking a different spinning wheel. either the motor itself or the wheel that turns the treadmill walking belt pad