NIU KQi3 Sport / KQi3 Pro – Setup, Charging, Operation, Maintenance & Fault GuideUpdated a month ago

MANUAL

WHAT’S IN THE BOX

NIU KQi3 scooter
Extension nozzle
M5 screws × 7 (2 spare shown in the manual image)
Power adapter
3 mm socket head wrench

PRODUCT OVERVIEW

The manual labels these parts:

Instrument
Bell
Brake lever
Accelerator
Headlight
Front reflector
Side reflector
Wheel hub motor
Charging port
Folding wrench
Folding buckle
Disc brake caliper
Battery compartment
Kickstand

DASHBOARD INFO

The dashboard shows:

Bluetooth status
Abnormal temperature warning
Light status
Fault warning
Real-time vehicle speed / fault code display
Battery indicator
Pedestrian mode status
Riding mode
Operation key

Dashboard controls

Long press the power button to turn the device on or off
Short press once for gear switch
Short press twice for light switch
Short press three times for speed unit switch
Short press five times to enter pedestrian mode

Pedestrian mode

Entered by short pressing the button 5 times
Speed is limited to 6 km/h
Short press again to exit this mode

Riding mode display

E-SAVE lights up: E-save mode
E-SAVE off: Sport mode
E-SAVE flashing: Custom mode (in app)

SETTING UP THE SCOOTER

Body assembly

Secure the scooter neck tube and open the kickstand.
Connect the handlebar to the main line connector of the vertical tube and install the handlebar to the vertical tube.
Confirm that the device will power on and off after assembly.
Lock the screws on both sides alternately with the hexagon wrench from the package.

Handlebar screw tightening torque:

4–5 N·m

Folding

Confirm that the kick scooter is powered off.
Hold the vertical tube.
Open the folding wrench.
Align it to the position of the mudguard hook.
Hook the hook under the dashboard to the rear end of the body.
Press the buckle button on the mudguard when opening.
After the hook under the dashboard is separated from the folding buckle, straighten the vertical tube to lock the folded plate.
Turn the folding wrench back.

Handling

Fold the scooter, then hold the standpipe with one hand or both hands before transport.

CHARGING

Charger connection

First open the charging port
Plug the charging plug into the body charging port
Finally connect the power supply to charge
After charging is complete, fasten the charging port cover to prevent water intake

Charging cautions

Do not charge when the charging port, charger, or power socket is wet
Turn off the power before charging
Use only the original charger supplied by NIU
Do not use other charger types
Do not charge or continue using the battery if the battery is damaged or flooded
Close the interior cover after charging or when not charging
Do not charge outdoors
Do not ride while charging

PARKING

Please lower the kickstand after using and park the vehicle
Please raise the kickstand before using

FAST LOCKING

How to lock

Connect the electric scooter to the installed app of NIU Technologies via Bluetooth and activate the fast locking function in the app.
Long press the On/Off button for 5 seconds to lock the scooter.
The lock icon is displayed on the meter.
The manual also shows alarm when locking and fast flashing during locking.

How to unlock

Long press the On/Off button for 2 seconds to start the scooter.
Click the Unlock button on the app interface to unlock the scooter connected to the app.

DOWNLOADING THE APP / ACTIVATION

Scan the QR code and install the NIU E-Scooter App
Bind and activate the scooter according to the prompts
After installing the app, log in and register
Long press the button to power it up and the Bluetooth icon starts flashing
In the app, tap Me > Device Binding > Bind with Bluetooth
The scooter beeps when Bluetooth connects successfully
The Bluetooth icon stops flashing and stays on after successful connection
Activate the scooter according to the prompts in the app and complete the riding safety learning content

Important app notes

Your phone needs:
- Bluetooth 4.2 or above
- iOS 9.0 or above
- Android 5.0 or above
After activating the vehicle owner mode, the scooter will be locked in E-SAVE mode
This function is intended to limit riding speed in some urban city roads or to comply with local speed regulations
After 50 km, the scooter will loosen up so it can reach higher mode speed features available in the app
The account paired with Bluetooth for the first time is the vehicle owner
If the account connection changes, the Bluetooth needs to be reset
If changing the NIU account, the original owner should unbind the vehicle in advance

BEFORE RIDING

Before riding:

Ensure the steering system and folding system are working properly and components are tightly secured
Check whether the wheel axle is fastened to the body so the wheel rotates normally and the brake system works normally
Check tyre pressure before riding
Recommended tyre pressure: 45–50 psi
Check tyre and brake pad wear
If wear is serious and replacement is needed, contact the dealer in time

RIDING THE SCOOTER

Turn on the power and check the power indicator.
Stand on the pedal with one foot and push back with the other foot.
When the scooter is sliding, stand on the pedal with both feet stable and gently press the throttle twistgrip.
The speed above 4 km/h starts the throttle.
Release the throttle twistgrip and use energy recovery to decelerate.
Emergency braking requires powerful grip on both sides of the brake levers.
The body should lean slightly to the direction of turning and the handlebar should be turned slowly.

Additional riding notes

The risk of fall injuries is present during practice
Wear a helmet, elbow pads, knee pads, and wrist guards while riding
The deceleration strength through energy recovery can be adjusted within the app

WARNINGS

The manual includes these riding warnings:

Do not ride in the drive lane of public roads, motorways, or highways
Do not ride in the rain
Riding distance may be shortened in wet weather, so drive carefully
Do not ride where the water depth is over the pedal or hub motor
Always keep your hands on the handlebar when driving
Do not ride over speed bumps or rough roads at high speed
Do not ride with more than one person, and do not carry children in arms
Do not accelerate downhill
It is forbidden to ride up and down stairs and over obstacles by jumping
Do not drive indoors
It is forbidden to turn the handlebar abruptly at high speed
Please avoid obstacles and be ready to stop
Do not hang heavy objects such as backpacks on the handlebar
Do not use the throttle when walking beside the kick scooter
Do not touch the disc brake or wheel hub motor after use to avoid burns
Avoid riding in the darkness

Additional safety warnings

Traffic conditions in the city vary, and it is recommended to avoid obstacle jumps
Reduce speed and prepare to stop when approaching pedestrians or cyclists
Maintain a safe distance from motor vehicles
In all cases, take care of yourself and others
Do not delete the use of the vehicle
This vehicle is not intended for acrobatic use
Caution: the brake may become hot in use. Do not touch after use.
Do not modify or transform the vehicle, including the steering tube, folding mechanism, and rear brake
The self-folded rear wheel is for one-wheel push when folding. These parts need periodic checking.
Do not make modifications that are not noted in the instructions

TROUBLESHOOTING / FAULT GUIDE

The manual includes a Troubleshooting of the whole vehicle table. The visible entries include:

31 displayed – Battery MOS tube damaged
Action: Please contact the dealer
32 displayed – Battery moderately hot
Action: Please contact the dealer
37 displayed – Battery short-circuit protection warning
Action: Please contact the dealer
33 displayed – Battery open-circuit or imbalance warning
Action: Please contact the dealer
3A displayed – Battery low-temperature warning
Action: Place the vehicle in a room-temperature area and re-use after the temperature returns to normal
3B displayed – Battery over-temperature warning
Action: Leave the vehicle still and re-use after the internal temperature returns to normal
3E displayed – Battery charging overcurrent protection warning
Action: Please disconnect the charger
39 displayed – Battery discharging overcurrent protection warning
Action: Please contact the dealer
40 displayed – Battery over-charging warning
Action: You can drive normally, but cannot recover after electricity reduces
41 displayed – Battery over-discharging warning
Action: Please charge the vehicle
42 displayed – Battery communication fault and verification failure
Action: Limit speed to 6 km/h, please contact the dealer
71 displayed – Power tube fault in the controller
Action: Please contact the dealer
72 displayed – Brake fault
Action: Check the brake and accelerator switch or contact the dealer
73 displayed – Accelerator fault
Action: Check the brake and accelerator handle or contact the dealer
74 displayed – Controller overcurrent
Action: Please contact the dealer
75 displayed – Controller low-temperature
Action: Leave the vehicle still and re-use after the internal temperature returns to normal
76 displayed – Fault of timing power of the controller
Action: Please contact the dealer
78 displayed – Under-voltage/over-voltage of the controller
Action: Please charge the vehicle or contact the dealer
77 displayed – Controller communication fault and verification failure
Action: Please contact the dealer
110 displayed – Motor idle-state
Action: Please contact the dealer
111 displayed – Motor phase loss
Action: Please contact the dealer
112 displayed – Motor Hall fault
Action: Please contact the dealer
120 displayed – Motor over-temperature
Action: Leave the vehicle still and re-use after the internal temperature returns to normal

MAINTENANCE AND CARE

Vehicle cleaning

Wipe the main frame with a soft wet cloth
If stains are hard to clean, use toothpaste and a toothbrush repeatedly, then wipe with a soft cloth
Do not clean the scooter with alcohol, gasoline, kerosene, or other corrosive and volatile solvents
Do not spray the scooter with pressure water or direct flushing
Before cleaning, make sure the scooter is powered off, the charging plug is removed, and the charging port has been buckled tightly, otherwise electric injury or major fault may occur

Vehicle storage

Accessories and additional items not approved by the manufacturer shall not be used
Store the device in a well-lit, stable, well-ventilated, and dry place
Prolonged exposure to UV rays, rain, and the elements may damage enclosure materials, so store indoors when not in use
For long-term storage, keep the battery power between 30% and 70%
Recharge the battery every two months
Fully charge before storage or before using after long-term storage
If abnormal sound or noise is heard during use, stop riding and solve the problem before continuing
If you notice a problem with the battery pack, do not charge by yourself and contact customer service

Battery warnings

The device contains batteries which can only be repaired by qualified persons
Use only the charger with this reference: PLI420-E250A54; otherwise battery failure, fire, or explosion may occur
Do not touch the battery contacts and do not open or expose the shell
Do not stop using the device if it has received violent crash, severe vibration, or water entry, because it may damage the battery and cause fire risk
It is strongly forbidden to immerse the battery and the vehicle body in water or into a fire
Do not ride the scooter if the suspension or body is deformed due to strong force
Please check tyre pressure before riding, if the tyre is over-inflated, there is a risk of poor road grip

Bearing maintenance

Check the vehicle’s status regularly
If there is abnormal bearing sound, or abnormal vibration, or bearing-related issues, stop riding and contact professional maintenance personnel
Do not try to repair by yourself
Do not touch the disc brake after use because it may become hot

Disc brake debugging

If the disc brake is too tight:

Loosen fixing nut
Use a wrench to loosen the brake arm lock
Turn the brake cable adjuster to shorten the cable
Turn the fixing nut clockwise to confirm the brake force and complete the adjustment

If the disc brake is too loose:

Loosen fixing nut
Use a wrench to loosen the brake arm lock
Turn the brake cable adjuster to lengthen the cable
Turn the fixing nut clockwise to confirm the braking force and complete the adjustment

Changing brake pads

Completely loosen the brake cable and remove the brake caliper from the vehicle body with a 5 mm hexagon wrench
Tilt the caliper body and remove it
Remove the old brake pads and clean the brake piston with a clean cloth
Put the new brake pads into the body through the gap of the brake discs
Install the caliper to the vehicle body, rotate the wheel while adjusting as needed

Handlebar shaking debugging

Check whether the vertical tube screws are loose
If yes, fasten the standpipe screws first, then fasten the two screws at the folding mechanism with a 6 mm hexagon wrench

Use of the extension nozzle

If your valve nozzle is short and it is inconvenient to inflate, use the extension nozzle to connect the valve and inflate
First remove the tyre valve and inner tube inflation nozzle cap, then connect the extension nozzle to the inflation valve and inflate after tightening it

NIU KQi3 Sport unboxing and setup video

NIU KQi3 PRO unboxing and setup video

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