A: The cause of the malfunction:
1. The safety door is not closed or the travel switch is loose
2. The locking pressure is too low
3. The solenoid valve is stuck
4. The top and back pressure are not in place
Handling method:
1. Check the safety door switch signal
2. Increase the locking pressure appropriately
3. Clean or replace the solenoid valve
4. Check if each action is in place
