ActronAir AMIB-8 Standard Residential Indoor PCB is the factory-fitted indoor control board for compatible ActronAir residential split ducted systems, managing indoor fan speed control, zone output switching, wall controller communication, and system fault code generation. A failed AMIB-8 board causes complete loss of indoor unit operation and zone control — fit the 100% Genuine ActronAir AMIB-8 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.