Aging motherboard components are prone to problems such as temperature control failure, indoor cold and hot. Replacing air-conditioning motherboard accurately regulates compressor operation, and the room temperature is uniform and constant, which improves the comfort of home use. Faulty mainboard will make the air conditioner start and stop frequently, idling at high load, and the power consumption will soar. Replace the air conditioner mainboard to intelligently adjust the working mode, reduce the invalid power consumption and reduce the daily electricity consumption. The hardware of the air conditioner fuselage is intact, only the motherboard fails. The cost of replacing the air conditioner motherboard alone is much lower than that of replacing the air conditioner. It is economical and practical to repair the equipment performance with lower cost. The signal transmission of aging mainboard is delayed, and the cooling and heating response of air conditioner is slow after starting. The signal transmission of replacing air conditioner mainboard is sensitive, and it can quickly enter the working state after starting without waiting for a long time. MCC-1642-04C