The outdoor unit powers on, but indoor units do not respond. All remote controllers show "--". Manual Solution: The wiring diagram shows that communication is via shielded twisted-pair cable (U1/U2 terminals). The manual details how to measure continuity and check for termination resistors. It also explains how to isolate a faulty indoor unit using the "Auto Addressing" mode (initiated by Dip SW 3-4).
Maintaining this unit requires following strict safety and technical protocols outlined in the Toshiba Service Manual : toshiba mmy-map1004ft8-e service manual
Total cooling capacity of 26.8 kW and heating capacity of 25.9 kW . The outdoor unit powers on, but indoor units do not respond