is an electronic control board used in medium-to-large capacity rotary screw compressors, such as those from Chicago Pneumatic and other manufacturers. It manages core operations like starting, stopping, loading, and unloading while providing diagnostics and status alerts via a built-in display.

The compressor is running under load (actively compressing air).

Press and hold the button (or the specific key combination indicated by the sub-menu) for 3 to 5 seconds.