Reasons:
1. The air pressure is too low.
If the current air pressure of the machine is lower than the set 0.3PSI air pressure, an error will be reported.
Solution:
Rotate the air assist button to adjust air pressure: turn counterclockwise to increase air volume, clockwise to decrease air volume.
Or you can also refer to this article link to modify the air pressure value of the air pressure detector:
2. The air pressure sensor faulty.
Solution:
End.