The Amana-Goodman 0130M00074S-420-660# High Pressure Switch is a protective control component used in air conditioners and heat pumps. It monitors refrigerant pressure levels and automatically shuts down the system if pressure exceeds safe limits, preventing compressor damage and system failure. https://www.partshnc.com/0130m00074s-amana-goodman-420-660-high-pressure-switch