ActronAir Digital Residential Outdoor PCB is the factory-fitted outdoor control board for the SRD230C digital residential split ducted system, managing inverter compressor staging, outdoor fan control, R22 refrigerant circuit protection, defrost management, and communication with the indoor AMIB board. A failed outdoor board on the SRD230C causes complete system lockout and cannot be bypassed -- fit the 100% Genuine ActronAir 2020-098B to restore factory digital outdoor control. Isolate power at mains before replacement -- live work on electrical components is dangerous and must only be performed by a qualified technician.