Hitachi Error Codes

 10.2 ALARM CODES

If a Safety Device is activated, cutting out the compressor, the Run light on the Remote Control switch blinks continuously and ABNML is indicated on the LCD display.

The Unit Identification A* etc is shown along with the Code Number for the Fault that has occurred.

The Code Numbers relating to each type of Fault is shown below.

Heat Pump

Fault Code = 01

Fault = Safety Device (Indoor Unit)

Fault Code = 02

Fault = Safety Device (Outdoor Unit)

Fault Code = 03

Fault = Transmission Indoor/Outdoor Unit

Fault Code = 05 Phase Rotation

Fault =

Fault Code = 08

Fault = Compressor High Temperature

Fault Code = 11

Fault = Air Inlet Thermistor

Fault Code = 12

Fault = Air Outlet Thermistor

Fault Code = 13

Fault = Freeze Protection Thermistor

Fault Code = 20

Fault = Compressor Thermistor

Fault Code = 22

Fault = Ambient Air Thermistor

Fault Code = 24

Fault = Defrost Thermistor

Fault Code = 25

Fault = Condensing Temperature Thermistor

Fault Code = 38

Fault = PCB Protection Circuit

Fault Code = 41

Fault = Overload Operation for Cooling

Fault Code = 42

Fault = Overload Operation for Heating

The LED’s 1-4 on the Outdoor Unit PCB will also light up according to the following table to indicate the fault which has occurred.

Fault Code = Normal

LED1 =

LED2 =

LED3 =

LED4 =

Fault Code = 01

LED1 = *

LED2 =

LED3 =

LED4 =

Fault Code = 02

LED1 =

LED2 = *

LED3 =

LED4 =

Fault Code = 03

LED1 =

LED2 =

LED3 = *

LED4 =

Fault Code = 05

LED1 =

LED2 =

LED3 =

LED4 = *

Fault Code = 08

LED1 = *

LED2 = *

LED3 = *

LED4 =

Fault Code = 20

LED1 = *

LED2 =

LED3 =

LED4 = *

Fault Code = 22

LED1 = *

LED2 = *

LED3 =

LED4 =

Fault Code = 24

LED1 = *

LED2 =

LED3 = *

LED4 =

Fault Code = 38

LED1 =

LED2 = *

LED3 = *

LED4 =

Fault Code = 41

LED1 = *

LED2 = *

LED3 =

LED4 =

Fault Code = 42

LED1 =

LED2 = *

LED3 = *

LED4 = *

Fault Code = 11-13

LED1 = *

LED2 = *

LED3 = *

LED4 = *

Cooling Only

Fault code = 02

Fault = Safety Device (Indoor or Outdoor Unit)

Fault code = 11

Fault = Air Inlet Thermistor

Fault code = 13

Fault = Freeze Protection Thermistor

Fault code = 38

Fault = PCB Protection Circuit

The reason for the failure should be traced and rectified as early as possible. The unit may then be restarted by pressing the Run/Stop button.

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