What are the reasons for an angle iron punching and cutting machine failing to reset?

Manufacturers of threading machines identify four common causes for this issue:
1.Improper piping connection of the pneumatic-hydraulic punching unit
2.Insufficient inlet air pressure
3.Mechanical faults of the pneumatic-hydraulic punching unit or solenoid valve malfunction
4.Inadequate lifting force from the booster cylinder of the pneumatic-hydraulic punching unit
These are the root causes for the angle iron punching and cutting machine failing to reset, as summarized by threading machine manufacturers.