Troubleshooting
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It may be the pedal bead groove or the middle shaft bearing. It is recommended that users replace the pedals to eliminate the pedal cause.

Check the disc to see if it is rubbing against the brake. If so, refer to the video to perform the alignment operation.

Run the motor at idle speed to see if there is still noise.

Check the brake pads and discs for oil stains. Clean the surface of the pad with a degreasing cleaner, blow dry, and then reinstall.

Temporary release: remove the headlight housing and unplug the speaker wire. At the same time, check whether the instrument speaker button is stuck, there is no pressing feel, and no rebound

Check whether the torque line is squeezed abnormally

Enter the password on the display again to unlock, and use the APP to connect the vehicle to unlock

1️⃣It may be that the voltage of the small battery on the password board is insufficient. Open the large battery or press the seat tube clamp in place. Try to unlock again after charging for one hour
2️⃣Disconnect the password board battery and try to unlock after reconnecting

Solve by replacing the tight ring (olive head) and refilling with oil

Check to make sure there is no oil leakage in the brakes, check the wear of the brake pads, if the wear is serious, refill the brake pads with oil and replace them.

Adjust the tension screw on the brake handle and turn it clockwise 3-4 turns

Check the charger voltage

Check battery voltage.
1️⃣Connect the power switch in series, and then use a multimeter to check if the battery has voltage output
2️⃣Use a multimeter to check the battery voltage output

Check the charger voltage.

There is no fuse inside, just replace the battery directly

Fully charge the battery, do not install it in the vehicle, let it sit for a week, then test the battery voltage and feedback the voltage test results.

Separate the power cut-off wire of the right brake lever from the throttle; if power cannot be restored after adjustment, the brake lever power cut-off wire is faulty and needs to be replaced. For replacements, contact support@fiido.com.

Fully charge the battery and test the battery voltage. If the voltage is normal, it is recommended to ride until it is out of power as a self-check. The riding test will inform you of the factors affecting the insufficient mileage: low temperature, road conditions (riding environment), load weight, insufficient tire pressure, riding speed, riding habits (frequent braking). It is recommended to provide the above data for diagnosis

E1 Troubleshooting Guide
If your bike has an E1 fault, it is usually caused by abnormal communication between the electronic control system. Please follow the steps below to check and solve the problem:
1️⃣ Check the connection cables: Please check all the connecting cables and connectors between the bicycle display and the controller to make sure they are not disconnected, pinched or damaged. If you find any abnormality, please take a photo and send it to us so that we can provide further solutions. 2️⃣Disconnect the booster: If the cable connection is normal, try to find the cable connector connected to the booster on the controller, disconnect it, restart the display, and check whether the E1 fault code disappears.
3️⃣Special operations for Fiido X models: For Fiido X models, please also disconnect the cable connector connected to the PIN pad and check whether the E1 fault code disappears.If the E1 fault code persists after completing the above steps, the display and controller may need to be replaced. Please contact us to verify the warranty period and delivery address, and we will arrange replacement parts for you. After-sales team email:support@fiido.com

E2 Troubleshooting Guide
E2 fault is usually caused by abnormal throttle (accelerator). Please check and solve the problem according to the following steps: 1️⃣Check the throttle (accelerator) connection: If your bike does not respond when you use the throttle to accelerate and does not run properly electrically, first check that the throttle cable connector is well connected. Try reconnecting the connector and see if the fault code disappears.
2️⃣Check the power assist mode:In power-assisted mode, turn the pedal to check if the motor responds. If the motor works normally, it means that there may be a poor solder joint or poor Hall sensor in the bicycle's handlebar circuit, and a new handlebar needs to be replaced.
3️⃣Check whether the throttle (accelerator) is abnormal: If the motor continues to run under throttle control, disconnect the power by holding the brake handle, turn off the display, and lift the rear wheel so that it is not touching the ground. Check whether the throttle handle returns to its original position. If the fault does not recur after the throttle cable connector is disconnected, it indicates that the throttle is abnormal and needs to be replaced. If the fault persists, there may be a problem with the controller's communication line, and the controller needs to be replaced. If the problem is still not solved after following the above steps, you may need to replace the throttle (accelerator) or controller. Please contact us to confirm the warranty period and delivery address, and we will arrange for replacement parts for you.After-sales team email:support@fiido.com

E3 Troubleshooting Guide
The E3 fault is usually related to an abnormality in the bicycle's brake electronic control system. Please follow the steps below to check and solve the problem:
1️⃣Check the brake lever position: Please check whether the brake lever can automatically return to its original position. If the brake lever fails to return to its original position, the motor may not operate normally. In this case, you need to adjust the brake lever or replace the brake handle.
2️⃣Check the brake handle connection: Check that the cable connector connected to the brake handle is secure. You can try disconnecting and reconnecting the connector to see if the E3 fault code disappears.
3️⃣To replace the brake sensor or brake handle: If the above steps do not resolve the issue, the brake sensor or brake handle may need to be replaced.If the E3 fault persists after you have completed these checks, please contact us and we will arrange for the dispatch of accessories as soon as possible based on your feedback to help you get back on track.After-sales team email:support@fiido.com

E4 Troubleshooting Guide
E4 fault is usually caused by abnormal motor Hall system. Please follow the steps below to check and solve the problem:
1️⃣Check the motor connection cables: Please first check whether the cable connector connected to the motor is well connected. You can disconnect and reconnect the connector to see if the E4 fault code disappears. At the same time, check whether the cable connected to the motor is intact and whether there is any crack or disconnection. If you find any problems, please take a photo and send it to us for verification. After verification, we will arrange to replace the motor rotor or motor for you according to the warranty.
2️⃣Check the motor Hall system:If the above steps do not solve the problem, it may be that the Hall sensor inside the motor is faulty, which requires replacing the motor rotor or the motor itself. If the problem is still not solved after checking according to the above steps, please contact us to confirm the warranty period and delivery address, and we will arrange to replace the motor related parts for you.After-sales team email:support@fiido.com

Generally, this is a communication issue between the display and the controller.
① First, replace the display. If the bike returns to normal, the display is the problem.
② If the E1 error reoccurs after replacing the display, the controller is faulty and needs to be replaced. For replacements, contact support@fiido.com.

E6 Troubleshooting Guide
E6 fault is usually caused by controller-related abnormalities. Please follow the steps below to check and solve the problem:
1️⃣Check external electronic control components: Please check whether the external electronic control components (such as main line, lamp, motor phase line) connected to the controller are short-circuited. Short circuit may be caused by excessive temperature, resulting in melting of the connector or other damage. If a problem is found, please replace the controller or the corresponding external electronic control components according to the situation. 2️⃣Check the controller model and version:If you have replaced the controller yourself and the E6 fault occurs, it may be that the model or version of the controller does not match the bicycle. Please take a photo of the controller label and send it to us for confirmation. If the problem is still not solved after the above checks, please contact us and we will arrange replacement parts for you as soon as possible based on your feedback to help you resume riding.After-sales team email:support@fiido.com

Adjust and increase the locking force of the folding buckle to make the body fit tightly after locking

Check charger voltage

1️⃣C11 is connected in series with the power switch to measure the voltage at the discharge port
2️⃣C11 old battery connection base to measure battery voltage

Check the voltage at the controller instrument terminal

Check whether the Hall wire of the motor is loose, and re-plug the waterproof wire of the motor.

Replacing the motor still did not solve the problem

Check whether the square hole of the crank is worn or deformed (if it is not fallen off, unscrew the screw and remove the crank slot)

Check whether the square hole arm of the central axis is deformed and whether the central axis is loose

Make sure the chainring is not deformed, adjust the tension screw of the rear derailleur, and tighten the chain by turning it clockwise.

Disconnect the wires on both sides of the brake handle and test whether the power assist is restored.

Check whether the motor waterproof line is loose and re-plug it

Check whether the torque line is squeezed and damaged

Increase the locking force of the seat tube clamp

Check whether the front wheel is installed tightly

Check whether the handlebar and front fork are loose and whether the front of the bike is locked tightly.

Operate the finger shift, rotate the chain synchronously, and observe the chain engagement. If you find that the gear shifting is not smooth, you need to adjust the rear derailleur.

Adjust the rear derailleur H limit screw clockwise for 0.5-1.5 turns, and slowly fine-tune until the engagement is smooth.

Adjust the rear derailleur L limit screw clockwise for 0.5-1.5 turns, and slowly fine-tune until the engagement is smooth.