The GREE 30138000656 Main Control Board is an electronic control component designed to manage the operation of compatible GREE HVAC systems. It processes signals from sensors and other system components to coordinate functions such as temperature regulation, compressor operation, and fan control, depending on the unit's configuration. Commonly used in compatible GREE air conditioning ... https://www.partshnc.com/30138000656-gree-main-control-board