IV–50E15 Automatic Address Alarm (Too Few Units)1) When the indoor unit is connectedc Error detection methodAn error is determined when the indoor unit count responding to transmission is less than the indoor unitcount set on the outdoor unit. (Also detected apart from auto-addressing.)• The actual number of indoor units is less than the number of indoor units set on the outdoor unit.• Connected indoor unit power is OFF• An indoor unit has a short-circuited inspection pin (CN062/CN071) or TEST pin (CN064) upon powerON.• High voltage (AC200V, etc) was applied across indoor/outdoor operation wire circuit.d Troubleshooting1Powersupply1-1 Is the indoor unit power OFF?Yes Turn power ONNo 2-12Indoor/outdooroperationwiring2-1 Indoor/outdoor operation wiring broken or short-circuited?(See “5. Reference Document”)Yes Repair wiringNo 2-22-2 High voltage (AC200V, etc) applied across indoor/outdooroperation wire circuit?Yes 3-2No 3-13Indoor unitcount3-1Did the number of indoor units change after auto-addressing?Or, was the indoor unit count setting changed on the outdoormain board?Yes 3-2No 4-13-2 Perform pre-check before auto-addressing. (See “5. Reference Document”)4Indoorcontrolboard4-1 Is the inspection pin (CN062/CN071) or TEST pin (CN064) onthe indoor control board short-circuited?Yes Eliminate short-circuitNo 4-24-2 Is an option board (CN060) or wireless remote controller(CN041) connected to the indoor control board?Yes 4-3No 4-54-3Does E15 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 4-4No 4-54-4 Replace the removed option board or wireless remote controller operating unit, wiring and all.4-5 Is the LED blinking on the indoor control board? Yes 4-6No 5-14-6Nonvolatile memory (EEPROM) on the outdoor main unit is not inserted, is incorrectlyinserted or is defective → Correct or replace nonvolatile memory and program it in the remotecontroller properties setting mode.5Outdoormain board5-1On the outdoor main board, use setting No. 10 to set the indoor unit count. Then compare theindoor unit connection status using No. 9 (indoor unit check), and investigate the unaccountedindoor unit in detail.● 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 non-volatilememory (EEPROM) and replacing indoor control board.* In systems that link wiring systems where a water heat exchanger unit is connected, the state of hot and coldwater may output an Automatic Address Setting Warning.Should this happen, remove link wiring and set a different address.
