IV–52E16 Automatic Address Alarm (Too Many Units)c Error detection methodAn error is determined when the indoor unit count (water heat exchanger units) responding to transmissionexceeds the indoor unit count (water heat exchanger units) set on the outdoor unit. (Also detected apart fromauto-addressing.)• The actual number of indoor units exceeds the number of indoor units set on the outdoor unit (with indoorunit connected).d Troubleshooting1) When the indoor unit is connected1Autoaddress 1-1 Perform pre-check before auto-addressing. (See “5. Reference Document”)2) When the water heat exchanger unit is connected1Power supply 1-1 Is the power to the water heat exchanger unit’s switchedoff?Yes Switch on the powerNo 2-12Indoor/outdooroperation wiring2-1 Is the indoor/outdoor operation wiring severed or short-circuited?Yes Repair WiringNo 2-22-2 Is high voltage (AC200V, etc.) being applied to the indoor/outdoor operation wiring circuits?Yes 4-1No 3-13Water heatexchanger unitcount3-1Has the number of connected indoor units set with theNo.10 parameter on the outdoor unit’s main board beenamended to a figure other than two?Yes 3-2No Reset the outdoor unit’spower supply3-2 Set the number of connected indoor units to two with the No.10 parameter on the outdoorunit’s main board.4Remotecontroller wires(link wiringbetweenthe remotecontroller andthe water heatexchanger unit)4-1 Is the water heat exchanger unit’s control board 2P-13already in use?YesReplace the water heatexchanger unit’s controlboardNoReverse the water heatexchanger unit’s controlboard connectors (2P-12→ 2P-13)● See “5. Reference Document” for details on the procedure for replacing the water heat exchanger unit’scontrol board.
