As an Eahora Romeo Ⅱ e-bike owner, encountering after-sales issues can inevitably disrupt your riding experience. This comprehensive guide compiles high-frequency faults across core components like motors, batteries, displays, and brakes, complete with detailed troubleshooting steps, required customer materials, and instructional videos/photos. Optimized for SEO, it’s designed for easy searchability and quick reference whenever you need it.
Motor Issues
1. Front Motor Not Working
- Verify the front motor cable is securely plugged in and undamaged.
- Confirm the display is set to Front Drive Mode or All-Wheel Drive (AWD) mode.
- If steps 1 & 2 are correct, lift the front wheel and apply throttle to record a video showing the motor not spinning.
- Solutions:
- If cables are loose or damaged, reconnect or request a replacement cable.
- If the motor is connected and in the correct mode but doesn't work, it may be an internal issue requiring a motor core replacement.
2. Front Motor Making Grinding Noise / No Power
- What to Check/Provide: A test result.
- Solution: This test determines if the issue is with the controller or the motor itself.
- Swap the Test: Disconnect the front motor cable from the controller. Connect the controller's front motor port to the rear motor.
- Set the display to Front Drive Mode.
- Test ride. If the rear motor now works in this mode, the controller is fine, and the front motor needs service/replacement.
3. Rear Motor Noise, Weak Power (No Error Code)
- What to Check/Provide: A clear video of the rear wheel spinning freely in the air (lift the bike) with the throttle applied.
- Solution: The video helps diagnose if the noise is from the motor bearings, internal gears, or if it's a brake issue. Support will advise based on the video.
4. General Motor Maintenance
- Topic: Regular motor maintenance after 100+ miles.
- Solution: Periodically apply high-temperature grease to the motor gear systems to ensure smooth operation and longevity.
Battery & Charger Issues
1. Battery Won't Charge
- What to Check/Provide: Use a multimeter to measure and report the battery's output voltage.
- Solution: The voltage reading indicates if the battery has a deep discharge, a BMS issue, or if the problem lies with the charger.
2. Battery Stuck, Cannot Remove
- What to Check/Provide: Photos of the battery compartment after following the steps below.
- Solution:
- As a last resort, if the lock mechanism has completely failed, you may need to carefully break off the battery compartment lock with a tool.
- This operation, if done carefully, should not damage the frame or battery.
- Contact support immediately for guidance and a replacement lock. They will provide a reference video and arrange a new lock shipment.
3. Charger Issues (Smell, Flickering)
- Customer Report: Charger cycles on/off repeatedly, has a burning smell, and LED flickers. Works intermittently.
- Solution: Stop using the charger immediately! This indicates a faulty charger that poses a safety risk.
Display (Instrument) Issues
1. Display Won't Turn On or is Frozen
- What to Check/Provide:
- Confirm if it can reboot after being powered off.
- If it reboots, check if the screen lights up and if the throttle responds.
- A clear photo of the display connection port.
- Solution: Likely requires a display repair or replacement.
2. Unable to Set Gear to "0."
- Solution: Adjust the PWM setting on the display:
- Long-press "+" & "-" to enter settings.
- Navigate to Information > PWM Set > Gear 5 > change value to 5.
- Exit and restart the display.
3. Display Shows Battery Percentage
- Solution: This can be enabled by updating the display firmware—contact support for the procedure.
Common Error Codes
| Code | Meaning | Field Check | Part Sent |
|---|---|---|---|
| E08 | Motor hall open | Swap front/rear leads in FWD mode to isolate the dead side | Motor or controller |
| E12 | Controller timeout | Re-seat the main 8-pin harness inside the top tube | Controller |
| E17 | Brake lever short | Disconnect both brake noodles, power-cycle; code gone = new lever | Brake sensor pair |
| E24 | Rear motor phase short | Plug/unplug rear 3-pin; if still present swap front→rear test | Rear motor |
| E30 | Comm-bus corrupt | 1) Unplug throttle – should drop to E05 2) If no E05, unplug PAS (yellow 3-pin in controller) |
Throttle or PAS harness |
Other Components
- Rear Brake Noise: A loud noise, only when the throttle is applied, is often disc brake rubbing. A simple adjustment of the rear brake caliper usually fixes it.
- Weak/Flickering Headlight: Check all wire connections. Try unplugging and replugging the taillight connector. If persistent, it may be a controller issue.
- Front Fork Won't Rebound:
- Ensure the fork lock isn't too tight; slightly loosen the front axle screws.
- If that fails, a detailed video of the fork being pressed down and not rebounding is needed for warranty assessment.
- Rear Rack Holes Misaligned:
- Measure the distance between mounting holes (should be ~3.8 inches).
- Install all bolts loosely first, only tightening fully once all are in place.
Need More Help?
If you've gone through these steps and the problem persists, please get in touch with Eahora Customer Support. Please provide your order number, a clear description of the issue, and any requested photos or videos. This will ensure the fastest and most accurate service.
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