| Symptom | Likely Cause | Solution | |---------|--------------|----------| | Bike won’t turn on | Battery low / loose connection | Charge battery; reseat battery; check display connector | | Motor not responding | Brake lever stuck engaged | Check brake cut-off switch; return lever fully | | Reduced range | Low tire pressure / cold weather | Inflate tires; store battery indoors before ride | | Error E-021 | Throttle not at zero on startup | Turn bike off, release throttle, turn on again | | Grinding noise | Loose spokes or brake rub | Check spoke tension; center brake caliper |
Zpao electric bike manuals , the primary resources depend on your specific model, such as the Zpao RF350 Zpao Electric Bike Manual