The functional filling of Hitachi air conditioners can not only inform about the presence of a breakdown, but also diagnose the type of this breakdown and output the error code on an indicator of an inner unit or external unit. Our table presented below will help to decipher its error codes.
Hitachi RAS-H(V)RNME-AF air conditioner troubleshooting
RAS-H(V)RNME-AF is a model of air conditioner produced by the Japanese company Hitachi. Some of the optional functions of this model include anti-legionella (disinfection option), a swimming pool configuration, a summer switch-off function (that can be set to auto mode, if desired), and a tariff function (it can be enabled or disabled depending on your personal needs).
| Alarm code | Origin | Detail of abnormality | Main cause |
|---|---|---|---|
| 2 | Outdoor | Activation of outdoor unit protection device (Except for Alarm Codes 41,42) | High pressure interrupting device activated |
| 3 | Outdoor | Transmission error | Outdoor fuse meltdown, indoor/outdoor connection wiring (breaking, wiring error, etc.) |
| 4 | Outdoor | Inverter transmission abnormality | Control PCB - Inverter PCB connection wiring (breaking, wiring error, etc.) |
| 5 | Outdoor | Power phase detection abnormality | Power source wiring open phase in indoor units |
| 6 | Outdoor | Undervoltage, overvoltage | Outdoor PCB abnormality, inverter PCB abnormality. DM, CB abnormality |
| 7 | Outdoor | Abnormal decrease of discharge gas superheat degree | Excessive refrigerant, expansion valve open-locked, fan motor locked |
| 8 | Indoor | Compressor-top Temperature over-increase | Shortage or leakage of refrigerant, piping clogging, fan motor locked |
| 11 | Indoor | Water inlet thermistor abnormality | Loose, disconnected, broken or short-circuited connector |
| 12 | Indoor | Water outlet thermistor abnormality | Loose, disconnected, broken or short-circuited connector |
| 13 | Indoor | Indoor liquid pipe temperature thermistor abnor- mality | Loose, disconnected, broken or short-circuited connector |
| 14 | Indoor | Indoor gas pipe temperature thermistor abnor- mality | Loose, disconnected, broken or short-circuited connector |
| 15 | Indoor | Water outlet C2 thermistor abnormality | Loose, disconnected, broken or short-circuited connector |
| 16 | Indoor | Water DHWT thermistor abnormality | Loose, disconnected, broken or short-circuited connector |
| 17 | Indoor | Auxiliary thermistor abnormality | Loose, disconnected, broken or short-circuited connector |
| 18 | Indoor | Water outlet boiler thermistor abnormality | Loose, disconnected, broken or short-circuited connector |
| 19 | Outdoor | Water outlet HP thermistor abnormality | Loose, disconnected, broken or short-circuited connector |
| 20 | Outdoor | Compressor-Top temperature thermistor abnor- mality | Loose, disconnected, broken or short-circuited connector |
| 22 | Outdoor | Outdoor temperature thermistor abnormality | Loose, disconnected, broken or short-circuited connector |
| 24 | Outdoor | Outdoor heat exchanger liquid pipe thermistor abnormality | Loose, disconnected, broken or short-circuited connector |
| 31 | Outdoor | Indoor/Outdoor combination setting error | Outdoor/Indoor unit capacity setting error, indoor total capacity excessively large/small |
| 35 | Outdoor | Indoor unit number setting error | Indoor units with the same number in a refrigerant piping system |
| 38 | Outdoor | Outdoor protection detection circuit abnormality Cooling overload | Outdoor PCB abnormality, error in wiring to outdoor PCB |
| 41 | Outdoor | Heating overload | Outdoor heat exchanger clogging/short circuit, broken outdoor fan motor |
| 42 47 | Outdoor | Suction pressure decrease prevention activated Inverter current sensor abnormality | Outdoor heat exchanger clogging/short circuit, expansion valve close-locked |
| 51 | Outdoor | Shortage or leakage of refrigerant, piping clogging, expansion valve close-locked, fan motor locked Error in CT wiring, outdoor PCB abnormality, inverter PCB abnormality |
|
| 48 | Outdoor | Overload operation protection activation Inverter module error | Cycle abnormality, inverter PCB abnormality, DM abnor- mality. heat exchanger clogging, etc. |
| 53 | Outdoor | Compressor. ISPM abnormality, heat exchanger clogging, etc. | |
| 54 | Outdoor | Inverter fin temperature abnormality Inverter non-operation | Fin thermistor abnormality, heat exchanger dogging, fan motor abnormality |
| 55 59 b1 | Outdoor | Inverter fin temperature thermistor abnormality Error in address/refrigerant system setting | Inverter not operating or broken |
| EE | Outdoor | Compressor factor alarm | Loose, disconnected, broken or short-circuited connector |
| 70 | Outdoor | Hydraulic alarm | Address/refrigerant system setting over 64 |
| 71 | Indoor | Water pump feedback | Alarm to notify damage to compressor occurs 3 times within 6 hours |
| 72 | Indoor | Thermostat heater alarm | Water pressure or water flow is not detected in the hydraulic cycle |
| 73 | Indoor | Mixing overheating limit protection for mixed circuit. | High temperature is detected in electric heater T>75°C Circuit 2 supply temperature > target temperature + offset |
| 74 | Indoor | Unit overheating limit protection | Two > Tmax +5K |
| 75 | Indoor | Freeze protection by cold water inlet, outlet temperature detection | Tl or Tg < -20°C for 30 seconds (Only heating mode) |
| 76 | Indoor | Freeze protection stop by indoor liquid tempera- ture thermistor | |
| 77 | Indoor | Opentherm communication failure | No Opentherm communication for a continuous period of 1 minute. |
| 78 | RF Communication failure Unit capacity setting error | No communication for 1 hour with one or two RF recei- vers which are bound to the RF-Bridge. | |
| 79 | Indoor-outdoor | LCD H-link transmission error | No concordance between indoor and outdoor unit capa- dties |
| 80 | Indoor-outdoor LCD | No H-link communication for a continuous period of 1 mi- nute between indoor and LCD user control by connection wiring (breaking, wiring error, etc.) |
Hitachi RCI-1.0FSN3 air conditioner error codes
Hitachi RCI-1.0FSN3 is a high efficiency 4-way cassette air conditioner. It boasts good energy saving qualities, compact size and light weight. The cassettes are equipped with a built-in monitor sensor that is capable of reducing energy consumption. In addition to this the sensor serves for adjusting direction of airflow depending on your wish and individual preferences.
| Code number | Category | Abnormality | Cause |
|---|---|---|---|
| 1 | Indoor unit | Activation of the safety device | Failure of fan motor, drain discharge. PCB, relay, float switch activated |
| 2 | Outdoor unit | Activation of the safety device | Failure of fan motor, drain discharge. PCB, relay, float switch activated |
| 3 | Abnormal transmission between outdoor and indoor units | Incorrect wiring, failure of PCB, tripping of fuse, power supply OFF | |
| 4 | Transmission | Abnormal transmission between inverter PCB (DIP-IPM) and outdoor unit PCB (PCB1) | Abnormal transmission between PCB |
| 5 | Power supply | Abnormal operation of picking up phase signal | Main power supply phase is reversely connected or one phase is not connected. |
| 6 | Voltage | Excessively low voltage or excessively high voltage for the inverter | Incorrect wiring or insufficient capacity of power supply wiring |
| 7 | Cycle | Decrease in discharge gas superheat | Discharge gas superheat less than 10 degrees is maintai- ned for 30 minutes. |
| 8 | Excessively high discharge gas temperature at the top of compressor | Temperature of top compressor: Td Td > 132°C over 10 minutes, or Td >140°C over 5 minutes | |
| 11 | Air inlet thermistor | ||
| 12 | Sensor on indoor unit | Air outlet thermistor Freeze protection thermistor | Failure of thermistor, sensor, connection. |
| 14 | Gas piping thermistor | ||
| 16 | Remote thermistor | Failure of thermistor | |
| 17 | Sensor on indoor unit | Thermistor of RCS | Failure of thermistor |
| 19 | Activation of the protection device for the indoor fan motor | Failure of fan motor | |
| 20 | Compressor thermistor | Failure of thermistor, sensor, connection. | |
| 21 | High pressure sensor | Incorrect wiring, disconnected wiring, broken cable, short circuit. | |
| 22 | Sensor on outdoor unit | Thermistor for outdoor ambient temperature (THM7) | Failure of thermistor, sensor, connection. |
| 23 | Thermistor for discharge gas temperature (THM9) | Incorrect wiring, disconnected wiring, broken cable, short circuit. | |
| 24 | Thermistor for evaporating temperature (THM8) | Failure of thermistor, sensor, connection. | |
| 29 | Low pressure sensor | Incorrect wiring, disconnected wiring, broken cable, short circuit. | |
| 31 | Incorrect capacity setting or combined capa- city between outdoor and indoor units | Incorrect setting of the capacity code. | |
| 35 | System | Incorrect indoor unit number setting | Duplication of indoor unit number, number of indoor units over specifications. |
| 36 | Incorrect indoor unit combination | R22 indoor unit | |
| 38 | Abnormality of picking up circuit for protec- tion (Outdoor unit) | Failure of indoor unit PCB, incorrect wiring, connection to PCB in indoor unit. | |
| 41 | Cooling overload (possible activation of high pressure device) | O.U. pipe thermistor temp, is higher than 55 °C and the compressor top temp, is higher than 95 °C, O.U. protection device is activated. | |
| 42 | Heating overload (high-pressure device may be activated) | If I.U. freeze protection thermistor temp, is higher than 55 °C and compressor top temp, is higher than 95 °C, O.U. protection device is activated. | |
| 43 | Pressure | Activation of the safety device from com- pression ratio decrease | Abnormal compress (Compressor. Inverter damage) |
| 44 | Activation of the safety device from excessi- vely high suction pressure | Overload during cooling, high temperature with heating, loked expansion valve | |
| 45 | Activation of the safety device from excessi- vely high discharge pressure | Overload (obstruction of HEX, short circuit) mixture of inert gas | |
| 47 | Activation of the safety device from exces- sively low suction pressure (protection from vacuum operation) | Shortage or leakage of refrigerant, piping clogging, expan- sion valve close-locked, fan motor locked. | |
| 48 | Abnormality of current sensor for inverter | Failure of DIP-IPM, heat exchanger clogged, locked com- pressor, EVI/EVO failure or overcharge. | |
| 51 | Abnormality of Current Sensor for Inverter | Failure of control PCB, inverter module. | |
| 53 | Inverter | Protection activation of inverter module | Inverter module abnormality. |
| Failure of compressor, clogging of heat exchanger. | |||
| 54 | Inverter fin temperature increase | Abnormal inverter fin thermistor, clogging of heat exchan- ger, abnormal outdoor fan. | |
| 55 | Inverter Module abnormality | Failure of inverter module. | |
| 57 | Outdoor fan | Fan Motor abnormality | Disconnected wire of incorrect wiring between control PCB and inverter PCB. |
| Incorrect wiring or fan motor abnormality. | |||
| b1 | Indoor unit number setting | Incorrect setting of the unit and the refrige- rant cycle number. | Over 64 indoor units setting by number or indoor unit address. |
| b5 | Incorrect indoor unit connection number setting | There are more than 17 units not corresponding to H-Link II connected to one system | |
| EE | Compressor | Compressor protection | Failure of compressor. |