Hitachi Air Conditioners Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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C1
Ceiling cassette or ducted unit shows C1, fan may not run correctly
Indoor Fan Motor Lock / Overload (Cassette/Ducted)
C2
Cassette/ducted unit shows C2, abnormal coil temperature behavior
Indoor Heat Exchanger Sensor Fault (Cassette/Ducted)
C3
Cassette/ducted unit shows C3, unit may stop unexpectedly
Drain Pump / Float Switch Error (Cassette/Ducted)
E0
Indoor unit does not operate, display shows E0 shortly after power on
Indoor Unit EEPROM / Main PCB Communication Error
E1
Outdoor unit does not start, indoor fan may run, display shows E1
Indoor–Outdoor Communication Failure
E2
Unit stops cooling or heating, indoor display shows E2
Indoor Room Temperature Sensor (Thermistor) Fault
E3
Unit stops, may run briefly then shut down, E3 displayed on indoor unit
Indoor Coil (Evaporator) Temperature Sensor Fault
E4
Unit stops cooling, the indoor unit may show E4 after some minutes of operation.
Indoor Fan Motor / Fan Feedback Error
E5
Outdoor unit does not start, the indoor unit shows E5, no cooling or heating.
Outdoor Unit Power Supply / Overcurrent Protection Error
E6
Unit stops, the indoor unit shows E6, sometimes after running for a short time.
Outdoor Coil (Condenser) Temperature Sensor Fault
E7
Outdoor fan does not run, the unit stops with an E7 error on the indoor display.
Outdoor Fan Motor / Fan Feedback Error
E8
Unit stops with E8, which may occur during high load or extreme temperatures.
Indoor Unit Overload / Overheat Protection
E9
Unit stops with E9, sometimes accompanied by water leakage from the indoor unit.
Indoor Drainage / Float Switch Error
F1
Unit stops cooling, the indoor unit shows F1, and the compressor does not run.
Low Refrigerant Pressure / Refrigerant Circuit Protection
F2
Unit stops, F2 is displayed, often during heating mode on heat pump models.
High Discharge Temperature / Compressor Overheat
F3
Unit stops with F3, often during defrost or low ambient operation.
Outdoor Ambient Temperature Sensor Fault
F4
Unit stops with F4; the compressor may attempt to start then shut down.
Compressor Discharge Temperature Sensor Fault
F5
Unit stops with F5, often during cooling in very hot weather.
High Pressure Protection / Condenser Overload
F6
Unit stops with F6, may occur at low outdoor temperatures in cooling mode.
Low Pressure Protection / Evaporator Freeze Protection
F7
Unit stops with F7; compressor may not start, indoor fan may run.
Compressor Start Failure / Inverter Module Protection
F8
Unit stops with F8, sometimes after long continuous operation.
Indoor Heat Exchanger Overcool / Freeze Protection
F9
Unit stops with F9, may be associated with abnormal indoor fan behavior.
Indoor Fan Motor Feedback / Hall Sensor Error
P0
Unit does not start, P0 displayed, sometimes after a power outage.
EEPROM / Parameter Setting Error
P1
Unit stops with P1, may be related to power supply issues.
Voltage Protection / Power Supply Abnormality
P2
Unit stops with P2, often during heating mode on inverter models.
Compressor Overcurrent / IPM Protection
P3
Unit stops with P3, may be associated with outdoor PCB temperature.
Outdoor PCB Overheat / Heat Sink Protection
P4
Unit stops with P4, sometimes immediately after start.
Indoor–Outdoor Capacity Mismatch / Configuration Error
Symptom
Clicking or relay sounds but no cooling starts
Compressor Fails to Start
Symptom
Frost or ice forming on indoor unit coil or front panel
Evaporator Coil Freezing
Symptom
Indoor louver does not move or is stuck in one position
Louver Motor / Swing Mechanism Failure
Symptom
Indoor unit blows air but not cold (poor cooling performance)
Insufficient Cooling Capacity / Performance Degradation
Symptom
Indoor unit does not turn on at all (no lights, no response)
No Power to Indoor Unit
Symptom
Indoor unit makes loud rattling or buzzing noise during operation
Indoor Mechanical Vibration / Loose Components
Symptom
Outdoor unit covered with ice in heating mode (heat pump models)
Outdoor Coil Icing / Defrost Malfunction
Symptom
Outdoor unit makes loud grinding or squealing noise
Outdoor Fan or Compressor Mechanical Failure
Symptom
Outdoor unit not running while indoor fan blows normally (no cooling)
Outdoor Unit Non-Operation
Symptom
Remote control not operating the indoor unit
Remote Control / Receiver Communication Failure
Symptom
Strong musty or moldy smell from indoor unit when starting
Microbial Growth on Evaporator Coil and Drain Pan
Symptom
Unit emits burning or electrical smell during operation
Overheating Electrical Component
Symptom
Unit frequently turns on and off (short cycling)
Short Cycling / Incorrect Capacity or Sensor Placement
Symptom
Unit runs but room becomes too cold or too hot compared to set temperature
Temperature Control Inaccuracy
Symptom
Unit trips the circuit breaker when starting
Electrical Overcurrent / Short Circuit
Symptom
Water leaking from indoor unit front panel or dripping on wall
Indoor Condensate Drainage Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| C1 |
Ceiling cassette or ducted unit shows C1, fan may not run correctly
|
Indoor Fan Motor Lock / Overload (Cassette/Ducted) | View Details |
| C2 |
Cassette/ducted unit shows C2, abnormal coil temperature behavior
|
Indoor Heat Exchanger Sensor Fault (Cassette/Ducted) | View Details |
| C3 |
Cassette/ducted unit shows C3, unit may stop unexpectedly
|
Drain Pump / Float Switch Error (Cassette/Ducted) | View Details |
| E0 |
Indoor unit does not operate, display shows E0 shortly after power on
|
Indoor Unit EEPROM / Main PCB Communication Error | View Details |
| E1 |
Outdoor unit does not start, indoor fan may run, display shows E1
|
Indoor–Outdoor Communication Failure | View Details |
| E2 |
Unit stops cooling or heating, indoor display shows E2
|
Indoor Room Temperature Sensor (Thermistor) Fault | View Details |
| E3 |
Unit stops, may run briefly then shut down, E3 displayed on indoor unit
|
Indoor Coil (Evaporator) Temperature Sensor Fault | View Details |
| E4 |
Unit stops cooling, the indoor unit may show E4 after some minutes of operation.
|
Indoor Fan Motor / Fan Feedback Error | View Details |
| E5 |
Outdoor unit does not start, the indoor unit shows E5, no cooling or heating.
|
Outdoor Unit Power Supply / Overcurrent Protection Error | View Details |
| E6 |
Unit stops, the indoor unit shows E6, sometimes after running for a short time.
|
Outdoor Coil (Condenser) Temperature Sensor Fault | View Details |
| E7 |
Outdoor fan does not run, the unit stops with an E7 error on the indoor display.
|
Outdoor Fan Motor / Fan Feedback Error | View Details |
| E8 |
Unit stops with E8, which may occur during high load or extreme temperatures.
|
Indoor Unit Overload / Overheat Protection | View Details |
| E9 |
Unit stops with E9, sometimes accompanied by water leakage from the indoor unit.
|
Indoor Drainage / Float Switch Error | View Details |
| F1 |
Unit stops cooling, the indoor unit shows F1, and the compressor does not run.
|
Low Refrigerant Pressure / Refrigerant Circuit Protection | View Details |
| F2 |
Unit stops, F2 is displayed, often during heating mode on heat pump models.
|
High Discharge Temperature / Compressor Overheat | View Details |
| F3 |
Unit stops with F3, often during defrost or low ambient operation.
|
Outdoor Ambient Temperature Sensor Fault | View Details |
| F4 |
Unit stops with F4; the compressor may attempt to start then shut down.
|
Compressor Discharge Temperature Sensor Fault | View Details |
| F5 |
Unit stops with F5, often during cooling in very hot weather.
|
High Pressure Protection / Condenser Overload | View Details |
| F6 |
Unit stops with F6, may occur at low outdoor temperatures in cooling mode.
|
Low Pressure Protection / Evaporator Freeze Protection | View Details |
| F7 |
Unit stops with F7; compressor may not start, indoor fan may run.
|
Compressor Start Failure / Inverter Module Protection | View Details |
| F8 |
Unit stops with F8, sometimes after long continuous operation.
|
Indoor Heat Exchanger Overcool / Freeze Protection | View Details |
| F9 |
Unit stops with F9, may be associated with abnormal indoor fan behavior.
|
Indoor Fan Motor Feedback / Hall Sensor Error | View Details |
| P0 |
Unit does not start, P0 displayed, sometimes after a power outage.
|
EEPROM / Parameter Setting Error | View Details |
| P1 |
Unit stops with P1, may be related to power supply issues.
|
Voltage Protection / Power Supply Abnormality | View Details |
| P2 |
Unit stops with P2, often during heating mode on inverter models.
|
Compressor Overcurrent / IPM Protection | View Details |
| P3 |
Unit stops with P3, may be associated with outdoor PCB temperature.
|
Outdoor PCB Overheat / Heat Sink Protection | View Details |
| P4 |
Unit stops with P4, sometimes immediately after start.
|
Indoor–Outdoor Capacity Mismatch / Configuration Error | View Details |
| – |
Clicking or relay sounds but no cooling starts
|
Compressor Fails to Start | View Details |
| – |
Frost or ice forming on indoor unit coil or front panel
|
Evaporator Coil Freezing | View Details |
| – |
Indoor louver does not move or is stuck in one position
|
Louver Motor / Swing Mechanism Failure | View Details |
| – |
Indoor unit blows air but not cold (poor cooling performance)
|
Insufficient Cooling Capacity / Performance Degradation | View Details |
| – |
Indoor unit does not turn on at all (no lights, no response)
|
No Power to Indoor Unit | View Details |
| – |
Indoor unit makes loud rattling or buzzing noise during operation
|
Indoor Mechanical Vibration / Loose Components | View Details |
| – |
Outdoor unit covered with ice in heating mode (heat pump models)
|
Outdoor Coil Icing / Defrost Malfunction | View Details |
| – |
Outdoor unit makes loud grinding or squealing noise
|
Outdoor Fan or Compressor Mechanical Failure | View Details |
| – |
Outdoor unit not running while indoor fan blows normally (no cooling)
|
Outdoor Unit Non-Operation | View Details |
| – |
Remote control not operating the indoor unit
|
Remote Control / Receiver Communication Failure | View Details |
| – |
Strong musty or moldy smell from indoor unit when starting
|
Microbial Growth on Evaporator Coil and Drain Pan | View Details |
| – |
Unit emits burning or electrical smell during operation
|
Overheating Electrical Component | View Details |
| – |
Unit frequently turns on and off (short cycling)
|
Short Cycling / Incorrect Capacity or Sensor Placement | View Details |
| – |
Unit runs but room becomes too cold or too hot compared to set temperature
|
Temperature Control Inaccuracy | View Details |
| – |
Unit trips the circuit breaker when starting
|
Electrical Overcurrent / Short Circuit | View Details |
| – |
Water leaking from indoor unit front panel or dripping on wall
|
Indoor Condensate Drainage Failure | View Details |
No matching codes found
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