SW900 LCD · Hall sensor
24 SW900 LCD error code 24
Motor Hall signal abnormality
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.
- Failed Hall sensor
- Damaged Hall cable (axle exit, connector)
- Missing Hall supply from the controller
Safe test steps
- Power off and inspect connector and cable, especially at the axle exit.
- Powered, using the known pinout: Hall supply (+) to GND.
- Do all three signal wires toggle low/high when turned slowly by hand?
Workshop reference values
- Hall supply is often ~5 V (controller-specific); signals typically toggle between ~0 V and ~supply.
Repair approach
- Repair cable/connector; replace a failed sensor with the same type and orientation.
- If the Hall supply is missing, check the controller.
Tools needed
- Digital multimeter (CAT III, fused inputs)
- Back-probe pins
- Basic hand tools, insulated screwdrivers
Safety
- For tests with a spinning wheel use a secure work stand with the driven wheel raised.
- Do not try phase/Hall combinations under load.
This information does not replace manufacturer service documentation. Work on batteries and high-voltage parts only with the appropriate expertise.