Output point 1 open circuit fault
Output point 1 short-circuit fault
Output point 2 open-circuit fault
Output point 2 short-circuit fault
Output point 3 open-circuit fault
Output point 3 short-circuit fault
Output point 4 open circuit fault
Output point 4 short-circuit fault
Throttle connection fault
Brush function low voltage fault
Suction function low voltage fault
System time storage fault
System information storage fault