IV–37E04 Indoor Unit Receive Failure from Outdoor Unit1) When the indoor unit is connectedc Error detection methodAfter turning power ON, with no transmission from outdoor unit for 3 minutes. Or, an error is determinedwhen the outdoor unit does not respond.• Outdoor unit power is OFF.• With link wiring, when outdoor main board terminal resistor switch (S7) is set to “ON” for several units.• When turning power ON after completing auto-addressing, when the number of indoor units has changed.• When indoor unit power is not ON.• Inspection pin (CN062/CN071) or TEST pin (CN064) on the indoor control board is short-circuited.• Non-volatile memory (EEPROM) is not inserted when changing indoor board.• In the remote controller detailed settings mode, the indoor address is “undetermined”.• Indoor unit addresses duplicated• Indoor/outdoor operation wiring is short-circuited or broken.• Error in the reception circuit on the signal output board (option board)• Breakdown of outdoor unit• High voltage (AC200V, etc) applied across indoor/outdoor operation wire circuitd Troubleshooting1Powersupply1-1 Is/was the outdoor unit power OFF? Yes Turn power ON and wait3 minutesNo 1-21-2 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 With link wiring, is the outdoor main board terminal resistorswitch (S010) set to “ON” for several units?Yes Set only one unit to “ON”No 2-32-3 High voltage (AC200V, etc) applied across indoor/outdooroperation wire circuit?Yes 3-2No 3-13Indoor unitcount3-1 Did the number of indoor units increase or decrease afterauto-addressing?Yes 3-2No 3-33-2 Perform pre-check before auto-addressing. (See “5. Reference Document”)3-3In the remote controller detailed settings mode, check theindoor unit address (item code 13). Any undetermined (99) orduplicated addresses for indoor units?Yes 3-2No 4-14Indoorcontrolboard4-1 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 E04 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 (D002) blinking on the indoor control board? Yes 4-6No 4-74-6Nonvolatile 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.4-7 Is E4 displayed on all remote controllers for other indoor unitsconnected to this outdoor unit?Yes Replace outdoor mainboardNo Replace indoor controlboard
