Main Unit Control: As the core brain of the air conditioner, it manages the overall operation logic of the unit, coordinates the orderly work of various components, and controls the power on/off and operating modes. Precise Temperature Control: Collects indoor temperature data, compares it with the set temperature, automatically starts and stops cooling and heating to maintain a consistently comfortable indoor environment. Fan Speed Control: Adjusts the indoor and outdoor fan speeds according to temperature differences and modes, achieving low, medium, high, and automatic fan speed operation. Compressor Start/Stop Control: Precisely controls the start, operation, and stoppage of the air conditioner compressor, protects core components, and stabilizes cooling and heating efficiency. air conditioner computer board circuit board，Compatible For Gree，GRJ518-A, Manufacturer: HIZON