THE 3 ASSISTANCE MODE LEDS ARE FLASHING> Check that the battery is correctly inserted into its holder and connected> Check that the screen is correctly plugged into the cable connecting it to the controller   2. THE "ECO" MODE LED IS FLASHING> Charge the battery   3. THE "ECO" AND "NORMAL" MODE LEDS ARE FLASHING> Check that the motor cable is correctly plugged into the motor and to the controller (the connection behind your saddle) 4. THE "SPORT" MODE LED IS FLASHING> Check that the motor cable is correctly plugged into the motor and to the controller (the connection behind your saddle)> The motor is faulty. Please visit a Decathlon workshop 5. THE "ECO" AND "SPORT" MODE LEDS ARE FLASHING> Check that the brake levers are properly connected> Disconnect the right brake lever. Turn on the control screen. If the error code has disappeared, the right brake lever is faulty and should be changed at a Decathlon workshop> If the error message is still there, reconnect the right brake lever and disconnect the left brake lever. If the error code has disappeared, the left brake lever is faulty and should be changed at a Decathlon workshop. 6. THE "LIGHT" LED IS FLASHING> Check that the battery is correctly inserted and that the connector is in good condition.If the error is still there, please visit your nearest Decathlon workshop to have it resolved.