Xiaomi · Temperature
40 Xiaomi error code 40
Controller temperature too high
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.
- Overheating (high load, climb, hot ambient)
- Temperature sensor or cable fault
- Too cold ambient (battery)
Safe test steps
- Does the fault clear after cooling/warming?
- Infrared thermometer on the component.
Workshop reference values
- The permitted temperature limit is manufacturer-specific – use the official value.
Repair approach
- Reduce load, cool down; persistent fault: check sensor/component.
Tools needed
- Infrared thermometer
- Digital multimeter (CAT III, fused inputs)
Safety
- Never bypass a temperature sensor.
This information does not replace manufacturer service documentation. Work on batteries and high-voltage parts only with the appropriate expertise.
Related fault codes
39Battery temperature sensor 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