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Hitachi Error Codes & Troubleshooting
Hitachi Error Codes & Troubleshooting
Hitachi air conditioners deliver reliable performance with advanced features for home comfort.
Error Code: 01
Indoor temperature sensor error
Troubleshooting Steps:
Room temperature sensor malfunction. Check sensor and wiring connections.
Error Code: 02
Indoor coil sensor error
Troubleshooting Steps:
Indoor heat exchanger sensor fault. Professional replacement may be required.
Error Code: 03
Outdoor temperature sensor error
Troubleshooting Steps:
Outdoor ambient temperature sensor failure. Check sensor operation.
Error Code: 04
Outdoor coil sensor error
Troubleshooting Steps:
Outdoor heat exchanger sensor malfunction. Professional diagnosis needed.
Error Code: 05
Communication error
Troubleshooting Steps:
Communication fault between units. Check connecting cables and terminals.
Error Code: 06
High pressure error
Troubleshooting Steps:
High pressure protection activated. Check system pressures and refrigerant.
Error Code: 07
Low pressure error
Troubleshooting Steps:
Low pressure protection activated. Check for refrigerant leaks.
Error Code: 08
Compressor error
Troubleshooting Steps:
Compressor malfunction detected. Immediate professional attention required.
Error Code: 09
Fan motor error
Troubleshooting Steps:
Fan motor malfunction. Check for obstructions and motor operation.
Error Code: 10
Power supply error
Troubleshooting Steps:
Power supply voltage abnormality. Check electrical supply and connections.
Error Code: 11
Discharge temperature sensor error
Error Code: 12
Suction temperature sensor error
Error Code: 13
Liquid line temperature sensor error
Error Code: 14
Indoor PCB error
Troubleshooting Steps:
Indoor unit control board malfunction. Professional replacement required.
Error Code: 15
Outdoor PCB error
Troubleshooting Steps:
Outdoor unit control board fault. Professional diagnosis needed.
Error Code: 16
Compressor overcurrent
Troubleshooting Steps:
Compressor drawing excessive current. Professional diagnosis required.
Error Code: 17
Compressor locked rotor
Troubleshooting Steps:
Compressor motor locked. Immediate professional attention required.
Error Code: 18
Indoor fan motor error
Troubleshooting Steps:
Indoor fan motor malfunction. Check motor and remove obstructions.
Error Code: 19
Outdoor fan motor error
Troubleshooting Steps:
Outdoor fan motor fault. Check motor operation and obstructions.
Error Code: 20
EEV malfunction
Troubleshooting Steps:
Electronic expansion valve error. Professional diagnosis required.
Error Code: 21
Freeze protection
Troubleshooting Steps:
Indoor coil freeze protection. Check airflow and refrigerant levels.
Error Code: 22
Defrost sensor error
Error Code: 23
Current sensor error
Troubleshooting Steps:
Current sensing circuit malfunction. Check electrical connections.
Error Code: 24
Inverter overload
Troubleshooting Steps:
Inverter overload protection. Check electrical load and connections.
Error Code: 25
DC voltage error
Troubleshooting Steps:
DC bus voltage abnormality. Check power supply and inverter.
Error Code: 26
Heat sink temperature error
Troubleshooting Steps:
Heat sink overheating. Check cooling and ventilation.
Error Code: 27
Drain pump error
Troubleshooting Steps:
Drain pump malfunction. Check pump operation and drainage system.
Error Code: 28
Float switch activated
Error Code: 29
4-way valve error
Troubleshooting Steps:
Reversing valve malfunction. Check valve operation.
Error Code: 30
Filter sign
Error Code: 31
Remote controller error
Error Code: 32
Address setting error
Error Code: 33
Refrigerant shortage
Troubleshooting Steps:
Low refrigerant detected. Check for leaks and recharge system.
Error Code: 34
Oil return operation
Error Code: 35
Capacity mismatch
Troubleshooting Steps:
Indoor and outdoor unit capacity mismatch. Check system configuration.
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