Error 4 on a Trotter 685 and 900T treadmill

Probable Cause

This could be a 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 an error occurs; generally happens when the unit is elevated.

Corrective Action

Without a user, confirm the actual speed of the treadmill using Dynamic Tests (How to access Diagnostics Test Mode) and verify if the actual speed is above the set speed. If yes, then replace the motor controller.

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