Washer-dryer shows E21 and stops during spin, drum may not reach high speed on Xiaomi combo washer-dryer.

Safety first: Disconnect power before accessing the motor or control board.

• 1. Reduce load and retry: Remove some items and run a spin-only cycle to rule out simple unbalance issues.
• 2. Access motor: Remove the rear panel. Locate the Xiaomi BLDC motor at the back of the drum. Inspect the multi-pin connector for secure fit and no corrosion.
• 3. Check wiring harness: Follow the motor harness up to the control board, looking for pinched, cut, or burnt wires.
• 4. Inspect hall sensor (advanced): On many Xiaomi motors, the hall sensor is a small module attached to the motor stator. Ensure it is firmly mounted and its connector is secure. Replacement typically involves removing the motor and swapping the sensor module.
• 5. If E21 persists after sensor and wiring checks: The inverter section of the main control PCB may be faulty. Due to high-voltage components, have a professional technician test and replace the board if necessary.