S866 LCD · Motor phase
23 S866 LCD error code 23
Motor phase abnormality (phase loss)
Widely published – may differ by model/firmware
Note
Common error table of generic Chinese LCD displays (JN-type controllers). The paired controller defines the actual meaning.
Possible causes
General, component-based causes – not a manufacturer-specific statement.
- Burnt/loose phase connector
- Damaged phase cable
- Winding short or open circuit
- Controller power stage (MOSFET) fault
Safe test steps
- Battery disconnected, controller unplugged: compare A–B, B–C, C–A resistance.
- Does the motor resist rotation even with the controller unplugged?
- Discoloured or melted connectors.
Workshop reference values
- The three phase resistances should be close (typically ≤ 10 % apart); absolute value is motor-specific, often < 1 Ω.
Repair approach
- Replace connector/cable; for winding damage replace or professionally rewind the motor.
- For MOSFET faults repair/replace the controller.
Tools needed
- Digital multimeter (CAT III, fused inputs)
- Milliohm meter (4-wire) – for low resistances
- Basic hand tools, insulated screwdrivers
Safety
- Disconnect phase wires only when unpowered; do not re-power a shorted controller.
This information does not replace manufacturer service documentation. Work on batteries and high-voltage parts only with the appropriate expertise.