ActronAir WRC8019 Outdoor Control Assembly is the factory-fitted wrc8019 outdoor control assembly for ActronAir split ducted systems, managing compressor staging, outdoor fan control, refrigerant circuit protection, and defrost management. A failed board causes complete system lockout -- the compressor will not start -- fit the 100% Genuine ActronAir WRC8019 to restore factory system performance. Isolate power at mains before replacement -- live work on electrical components is dangerous and must only be performed by a qualified technician.