Hitachi_error_codes.pdf

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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

Fault

Safety Device (Indoor Unit)

Safety Device (Outdoor Unit)

Transmission Indoor/Outdoor Unit

Phase Rotation

Compressor High Temperature

Air Inlet Thermistor

Air Outlet Thermistor

Freeze Protection Thermistor

Compressor Thermistor

Ambient Air Thermistor

Defrost Thermistor

Condensing Temperature Thermistor

PCB Protection Circuit

Overload Operation for Cooling

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

LED1

LED2

LED3

LED4

Normal

ii-i3

Cooling Only

Fault Code

Fault

Safety Device (Indoor or Outdoor Unit)

Air Inlet Thermistor

Freeze Protection Thermistor

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.