Hitachi Aircon Error Codes & Blinking Lights

Find a code or blinking light pattern and check it against your aircon model.

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Hitachi error code & blinking light lookup

Which models and codes are covered?

Search Hitachi residential timer-light and airHome LD301 rows plus official SET FREE air365 Max / Max Pro VRF and Central Station EX commercial-controller alarms. Choose the matching family because the same code can mean a different fault.

Choose the residential timer-light, airHome LD301, SET FREE VRF, or Central Station EX controller family, then search the exact code shown on the unit or controller, or the LED10-13 pattern on the CH-Box PCB.

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112 matches

Browse all 97 Hitachi code pagesCanonical links grouped by the display or model family.

Residential timer-light codes

2 pages

Residential-only timer-light pages.

airHome LD301 blink codes

14 pages

Outdoor-board LD301 blink-count pages.

SET FREE and shared codes

65 pages

Commercial controller identities, including canonical pages that also decode residential meanings.

Central Station EX controller alarms

16 pages

PSC-A128EX H-LINK, PIO, adapter, media and controller-memory alarms.

Hitachi error code & blinking light lookup

01Reversing-valve, indoor coil temperature, or refrigerant-cycle abnormality

02Forced cooling or service-test operation indication

03Indoor-outdoor communication or interface fault

04Outdoor-unit fault; outdoor LED pattern may hold the sub-code

06Float switch or drainage fault

07Condensate evacuation pump manual start, drainage test mode, or central-board error

06Abnormal water level detection

07Drain pump test drive indication

08Damper defective or air outlet damper self-diagnosis

09Room-temperature sensor or indoor main-board fault

10Indoor fan motor fault

12Indoor-outdoor connection, outdoor board connector, or communication power fault

13EEPROM, microcomputer, or indoor control-board data fault

LD301-OFFNo power supply

LD301-1Reset stop

LD301-2Peak current cut

LD301-3Abnormal low speed rotation

LD301-4Switching failure

LD301-5Overload lower limit cut

LD301-6Compressor temperature rise

LD301-7Thermistor abnormal

LD301-9Communication error

LD301-10Power supply voltage error

LD301-11Fan stop by strong wind

LD301-12Fan lock stop

LD301-13EEPROM reading error

LD301-14DC voltage abnormal

LD301-15Circuit abnormal

LD301-16High load during stop

01Indoor-unit float-switch protection activated

02Outdoor-unit high-pressure protection activated

03Abnormal communication between indoor and outdoor units

04Abnormal communication between inverter PCB and outdoor PCB

05Power-supply phase abnormality

06Abnormal inverter voltage

07Discharge-gas superheat decreased

08Discharge-gas temperature increased

0AAbnormal communication between outdoor units

0bIncorrect sub-outdoor-unit address setting

0CIncorrect outdoor main-unit setting

11Indoor inlet-air thermistor abnormality

12Indoor outlet-air thermistor abnormality

13Indoor freeze-protection thermistor abnormality

14Indoor gas-pipe thermistor abnormality

15EconoFresh outdoor-air thermistor abnormality

16DOAS remote-sensor abnormality

17DOAS wired-controller built-in thermistor abnormality

18Indoor fan-system abnormality

19Indoor-fan protection device activated

1AIndoor fan-controller fin-temperature abnormality

1bIndoor fan-controller overcurrent protection activated

1CIndoor fan-controller current-sensor problem

1dIndoor fan-controller protection activated

1EIndoor fan-controller voltage abnormality

21High-pressure sensor abnormality

22Outdoor-air thermistor abnormality

23Compressor-top discharge-gas thermistor abnormality

24Outdoor heat-exchanger liquid-pipe thermistor abnormality

25Outdoor heat-exchanger gas-pipe thermistor abnormality

29Low-pressure sensor abnormality

30Incorrect outdoor-unit DSW settings for CH-Box

31Incorrect outdoor-unit and indoor-unit capacity setting

35Duplicate indoor-unit number in the refrigerant cycle

36Incorrect indoor-unit combination

38Outdoor protection-detection circuit abnormality

3AOutdoor-unit capacity abnormality

3bIncorrect outdoor-unit model combination or voltage setting

3dAbnormal communication between main and sub outdoor units

3EIncompatible inverter-PCB and outdoor-PCB combination

43Pressure-ratio decrease protection activated

44Low-pressure increase protection activated

45High-pressure increase protection activated

47Low-pressure decrease protection activated

48Inverter overcurrent protection activated

51Inverter current-sensor abnormality

53Inverter error signal detected

54Inverter fin-temperature abnormality

55Inverter failure

57Fan-controller protection activated