ActronAir Indoor PCB AMIB-P1 1Ph Digital is the factory-fitted indoor pcb amib-p1 1ph digital for ESP Plus Series 2 residential split ducted systems, managing EC fan motor speed control, zone output management, and wall controller communication. A failed board causes complete loss of indoor unit operation and zone control -- fit the 100% Genuine ActronAir 2020-115B 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.