Multiple circuit protection design, with overvoltage and overcurrent lightning protection, effectively resisting voltage fluctuations and reducing downtime caused by malfunctions. Energy-saving, low-consumption operation design, optimizing circuit power usage, helping the air conditioner run efficiently and saving electricity costs in daily use. Sturdy and reliable welding process, with full solder joints that are difficult to detach, shock and vibration resistant, ensuring excellent stability for home installation and use. Built-in self-diagnosis function, quickly detecting air conditioner anomalies, accurately pinpointing faults, making maintenance and repairs easier and more efficient. Moisture-proof and dust-proof sealing, preventing water vapor and dust from entering the mainboard, allowing stable operation even in humid environments without easy damage., Manufacturer: ql0328