This kit provides a visual indicator of compressor status. The York Saver circuitry monitors and displays the state of a York compressor using a bi-colored LED. It initially lights green when the compressor starts running and turns off when the compressor stops. If the compressor runs for more than 15 seconds it changes to red. This indicates that the compressor is at risk of serious damage and should be be disabled. This condition typically occurs due to a failure of an air line or another component.