Segway-Ninebot · Controller
29 Segway-Ninebot error code 29
Controller power stage (low-side MOSFET) fault
Widely published – may differ by model/firmware
Note
Table published for Xiaomi/Segway-Ninebot scooters; may differ by model/firmware.
Possible causes
General, component-based causes – not a manufacturer-specific statement.
- Internal controller fault (power stage, supply)
- Over-current or short on the motor/phase side
- Firmware/configuration error
Safe test steps
- Burnt smell, discoloration, water traces on the controller.
- Rule out motor, Hall, throttle and brake signal before replacing the controller.
Workshop reference values
- No general documented measurement value – manufacturer service documentation required.
Repair approach
- Fit a controller of the same voltage/current class and compatible protocol.
Tools needed
- Digital multimeter (CAT III, fused inputs)
- Basic hand tools, insulated screwdrivers
- Manufacturer dealer diagnostic tool/software (if available)
Safety
- Do not reconnect a controller suspected of a short to the battery.
This information does not replace manufacturer service documentation. Work on batteries and high-voltage parts only with the appropriate expertise.
Related fault codes
28Controller power stage (high-side MOSFET) fault10Communication error between dashboard and control board11Abnormal current in motor phase A12Abnormal current in motor phase B13Abnormal current in motor phase C14Throttle fault / not in zero position15Brake lever fault / not in zero position18Motor Hall sensor fault