The controller or motor has overheated from extended periods of extremely heavy use (for example, climbing a steep hill with maximum pedal assist applied), and has shut down to prevent damage. This occurs when the controller reaches 105 degrees Celsius. The bike may be getting pushed to its limits, causing the controller to become too hot. In some situations, removing extra weight from the bike and pedaling in a low gear/ PAS mode for long steep hills can prevent the bike from overheating. If the error code appears without engaging in strenuous cycling activities, a new controller may be needed.
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