Trotter 685 and 900T Treadmill Error 4

Probable Cause

This could be failure of the motor controller or this could be a result of the user actually pushing the belt faster than the set speed which if error occurs; generally happens when unit is elevated.

Corrective Action

Without a user, confirm actual speed of treadmill through Dynamic Tests and verify if actual speed is above the set speed. If yes, then replace the motor controller.