Here are the reasons:

● Air compressor break down

How to check if air compressor break down, there’s a common way to connect it to the power directly using the power cable of chiller, then check if air compressor can be turn on normally, like below:

● Wrong setting

The air assist can be controlled by the layer parameter of software, please make sure you have “If Blowing” selected to YES, like below:

Note: If the Processing Mode is Cut, “If Blowing: Yes” must not be changed.

● The air valve is close

Make sure have the manual air valve opened（horizontal means open), like below:

http://www.thunderlaser.in/how-to-use-your-laser-machine/how-to-use-the-air-valve.html

End.