IV–53E18 Group Control Wiring Communication Failure(Cannot be detected when the water heat exchanger unit is connected.)c Error detection methodWhen remote controller group control main unit cannot communicate with sub unit. An error is determinedwhen the remote controller group control sub unit has not communicated with the main unit for 3 minutes.• An indoor unit within group control is not powered ON.• Inspection pin (CN062/CN071) or TEST pin (CN064) is short-circuited on an indoor unit within groupcontrol.• Indoor unit DISP pin (CN063/CN072) is short-circuited on a sub indoor unit within group control.• Remote controller group wiring is broken.• Multiple indoor units within group control are set as “main.”• An indoor unit within group control is set as “independent.”d Troubleshooting1Indoor unit 1-1 Is the indoor unit power OFF? Yes Turn power ONNo 1-21-2Is the inspection pin (CN062/CN071) or TEST pin (CN064) orDISP pin (CN063/CN072) on the indoor control board short-circuited?Yes Eliminate short-circuitNo 2-12RemotecontrollergroupWiring2-1 Remote controller group wiring broken? Yes Repair wiringNo 2-22-2In the remote controller detailed settings mode, check thegroup settings (item code 14). Multiple main units (1), or anyindependent (0) settings?Yes 2-3No 3-12-3 Remote controller group wiring routed as intended? 2-42-52-4 Repeat auto-addressing process.2-5 After repairing remote controller group wiring, repeat auto-addressing process.3Indoorcontrolboard3-1 Is an option board (CN060) or wireless remote controller(CN041) connected to the indoor control board?Yes 3-2No 3-43-2Does E18 disappear several minutes after disconnecting saidconnector on the indoor control board? (When controlling withtwo remote controllers and the wireless remote controller isthe main, set the other remote controller as the main).Yes 3-3No 3-43-3 Replace the removed option board or wireless remote controller operating unit, wiring and all.3-4 Replace indoor control board● The designation (/) is used in the table to indicate indoor boards for DC and AC motor models.● There is no TEST pin on the indoor board for AC motor models.● See “5. Reference Document” for checking remote controller.● For board and Electrical Wiring Diagram, see Chapter 6.• Outdoor main board: page VI-2• Outdoor power board: page VI-3• Converter board: VI-4• Indoor control board for DC motor models: page VI-5• Outdoor Unit Electrical Wiring Diagram: page VI-6● See instructions packaged with servicing indoor board for procedure on replacing indoor control board.
