Hitachi Aircon Error Codes

Search any Hitachi error code below. Each entry shows what the code means, how urgent it is, and what to do next — with notes specific to Singapore installations.

Error Code Lookup

Type a code or filter by fault type. Expand any row for full details. For LED blink patterns, see the Hitachi diagnostic guide.

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Hitachi Aircon Error Codes

Error Code Lookup

E0EEPROM memory error - indoor unit PCB memory chip fault or data corruption

E1High-pressure protection - refrigerant circuit high pressure exceeded safe limit

E2Indoor coil freeze protection - evaporator coil icing detected

E3Low-pressure protection - refrigerant circuit low pressure detected

E4Compressor overheating protection - discharge temperature or compressor temperature exceeded limit

E5Compressor overload / overcurrent

E7Drainage / water overflow fault

E8Indoor PCB malfunction

F01Indoor temperature sensor fault

F02Outdoor temperature sensor fault

F03Evaporator (indoor coil) sensor fault

F04Condenser (outdoor coil) sensor fault

P01Overheating protection (compressor/system)

P02Abnormal power supply voltage

P03Fan motor protection / fault

E01Indoor-outdoor communication error

E02Outdoor unit communication fault

E03High-pressure protection

E04Low-pressure protection

E05Compressor overload protection

F09Defrost system error

FLFilter cleaning reminder (informational)

OPOutdoor unit protection (general)