ActronAir Indoor PCB AMIB is the factory-fitted indoor pcb amib for SRG residential and commercial split ducted systems, managing indoor fan speed control, zone output switching, and wall controller communication. A failed board causes complete loss of system operation and fault code display -- fit the 100% Genuine ActronAir 2020-102B 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.