1. Check whether the sensor is dusty, poorly connected or damaged (wipe off the dust on the sensor or replace it);

2. Check whether the data cable of the flexible guide belt is in poor contact or damaged (trim the data cable and re-plug or replace the data cable);

3. Check whether the ground wire contact is reliable or whether the high-voltage wire is damaged (re-ground or replace the high-voltage wire);

4. Poor contact of the motor wire.