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Troubleshooting
Symptoms
Possible Causes
1. Insufficient battery power
2. Faulty connections
The bike does not work
3. Battery not fully seated in tray
4. Improper turn on sequence
5. Brakes are applied
Irregular acceleration
1. Insufficient battery power
and/or reduced top
2. Loose or damaged twist power assist
speed
3. Misaligned or damaged magnet ring
1. Loose wiring
The motor does not
2. Loose or damaged twist power assist
respond when the bike
3. Loose or damaged motor plug wire
is powered on
4. Damaged motor
1. Low tire pressure
2. Low or faulty battery
3. Riding up steep hills, headwind, and
/or heavy payload
Reduced range
4. Battery discharged for long period
of time without regular charges, aged,
damaged, or unbalanced
5. Brakes rubbing
Most Common Solutions
1. Charge the battery
2. Clean and repair connectors
3. Install battery correctly
4. Turn on bike with proper sequence
5. Disengage brakes
1. Charge or replace battery
2. Replace twist power assist
3. Align or replace magnet ring
1. Repair and or reconnect
2. Tighten or replace
3. Secure or replace
4. Repair or replace
1. Adjust tire pressure
2. Check connections or charge battery
3. Assist with pedals or adjust route
4. Balance the battery; contact Tech
Support if range decline persists
5. Adjust the brakes
43
1. Charger not well connected
2. Charger damaged
The battery will not
3. Battery damaged
charge
4. Wiring damaged
Wheel or motor
1. Loose or damaged wheel spokes or rim
makes strange noises
2. Loose or damaged motor wiring
Error code Detection
Your bike is equipped with an error detection system integrated into the display and controller. In the case of an
electronic control system fault, an error code should display. The following error codes are the most common
and can aid in troubleshooting. If your bike has an error code displayed at any time, it is recommended that you
cease operation and contact HJMBIKE immediately.
Error Code Definition Table
Error code
21
22
23
Motor Hall Signal Abnormality
24
25
Communication Abnormality
30
1. Adjust the connections
2. Replace
3. Replace
4. Repair or replace
1. Tighten, repair, or replace
2. Reconnect or replace motor.
Definition
Current Abnormality
Throttle Abnormality
Motor Abnormality
Brake Abnormality
44
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