Comprehensive protection: equipped with multiple hardware protections including overvoltage, undervoltage, overcurrent, overload, and short circuit Variable frequency adaptation: supports DC variable frequency compressor drive, smooth speed regulation, energy saving and noise reduction Complete modes: supports cooling, heating, dehumidifying, fan-only, and automatic mode switching Complete interfaces: integrated standard interfaces for compressor, fan, four-way valve, and electronic expansion valve Fault Self-Test: Comes with fault code detection, automatically diagnoses and displays, convenient for maintenance, Manufacturer: pyh00628