86 Hitachi Air Conditioner Error Codes + troubleshooting

Table of Contents

It is so frustrating when your Hitachi air conditioner stops working amid a scorching heat wave and displays a weird error code. The problem becomes even worse when you have no clue what the error code means.

That is why we have prepared this guide where you can learn about all the error codes of Hitachi air conditioners.

Let’s start exploring it.

Hitachi air conditioner error code 01 (indoor unit)

Meaning:

Activation of the float switch (protection device).

Cause of error:

  1. Activation of the float switch.
  2. When the water level in the drain pan is high.
  3. When there is an abnormality in the float switch, drain pan, and drain pipe.

Hitachi air conditioner error code 02 (outdoor unit)

Meaning:

Activation of high-pressure cut (protection device).

Cause of error:

This error occurs due to the activation of PSH or other reasons like inert gas mixing, pipe clogging, and excessive refrigerant.

Hitachi air conditioner error code 03 (transmission)

Meaning:

There is an abnormality between the outdoor and the indoor unit (or the outdoor and outdoor unit).

Cause of error:

This problem is caused due to disconnected wires, loose terminals, incorrect wiring, tripping of fuse, blown out fuse, or when the power of the outdoor unit is OFF.

Hitachi air conditioner error code 04 (transmission)

Meaning:

There is an abnormality between the outdoor PCB and the fan controller OR an abnormality between the inverter PCB and Outdoor PCB.

Cause of error:

The error occurs due to transmission failure of the outdoor PCB or fan controller. It happens because of a blown fuse, loose connector, or broken wires.

Hitachi air conditioner error code 05 (supply phase)

Meaning:

There is a problem in the supply phases or power source phases.

Cause of error:

This error is caused due to incorrect power source, connection open-phase, and reversed-phase.

Hitachi air conditioner error code 06 (voltage)

Meaning:

The inverter voltage and/or fan controller voltage are abnormal.

Cause of error:

It is caused due to insufficient power capacity and a drop in outdoor voltage.

Hitachi air conditioner error code 07 (cycle)

Meaning:

There is a decrease in discharge gas superheat.

Cause of error:

The problem is caused due to thermistor failure, incorrect piping connection, excessive refrigerant charge, incorrect wiring, or locking of the expansion valve at opened position (disconnect connector).

Hitachi air conditioner error code 08 (cycle)

Meaning:

There is an increase in discharge gas temperature.

Cause of error:

The problem is caused due to pipe clogging, thermistor failure, incorrect piping connection, insufficient refrigerant charge, incorrect wiring, or locking of the expansion valve at a closed position (disconnect connector).

Hitachi air conditioner error code 0A (transmission)

Meaning:

There is an abnormality between the outdoor and outdoor.

Cause of error:

The error happens due to broken wires, loose terminals, and incorrect wiring.

Hitachi air conditioner error code 0B (outdoor unit)

Meaning:

The address setting of the outdoor unit is incorrect.

Cause of error:

Incorrect address settings of the outdoor unit.

Hitachi air conditioner error code 0C (outdoor unit)

Meaning:

The address setting of the outdoor main unit is incorrect.

Cause of error:

When there are 2 or more than 2 units set as “main unit” then this error occurs.

Hitachi air conditioner error code 11 (indoor unit sensor)

Meaning:

There is a problem with the inlet air thermistor.

Cause of error:

The problem occurs due to failure of the thermistor, short circuit, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 12 (indoor unit sensor)

Meaning:

There is a problem with the outlet air thermistor.

Cause of error:

The problem occurs due to failure of the thermistor, short circuit, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 13 (indoor unit sensor)

Meaning:

There is a problem with the freeze protection thermistor.

Cause of error:

The problem occurs due to failure of the thermistor, short circuit, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 14 (sensor on the indoor unit)

Meaning:

There is a problem with the gas piping thermistor.

Cause of error:

The problem occurs due to failure of the thermistor, short circuit, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 19 (fan motor)

Meaning:

The activation of a protection device for the indoor fan.

Cause of error:

It happens due to the locking or overheating of the fan motor.

Hitachi air conditioner error code 21 (sensor on the outdoor unit)

Meaning:

There’s a problem with the high-pressure sensor.

Cause of error:

The problem occurs due to failure of the thermistor, short circuit, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 22 (sensor on the outdoor unit)

Meaning:

There’s a problem with the outdoor air thermistor.

Cause of error:

The problem occurs due to failure of the thermistor, short circuit, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 23 (sensor on the outdoor unit)

Meaning:

There’s a problem with the discharge gas thermistor on top of the compressor.

Cause of error:

The problem occurs due to failure of the thermistor, short circuit, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 24 (sensor on the outdoor unit)

Meaning:

There’s a problem with the evaporating or heat exchanger liquid pipe thermistor.

Cause of error:

The problem occurs due to failure of the thermistor, short circuit, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 25 (sensor on the outdoor unit)

Meaning:

There’s a problem with the heat exchanger gas pipe thermistor.

Cause of error:

The problem occurs due to failure of the thermistor, short circuit, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 29 (sensor on the outdoor unit)

Meaning:

There’s a problem with the low-pressure sensor.

Cause of error:

The problem occurs due to failure of the sensor, thermistor, short circuit, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 31 (system)

Meaning:

The capacity setting of the outdoor unit/indoor unit is incorrect.

Cause of error:

Insufficient or excessive indoor unit total capacity code & incorrect capacity code setting of combination.

Hitachi air conditioner error code 35 (system)

Meaning:

The indoor Unit (No.) setting is incorrect.

Cause of error:

When the Indoor Unit No. is duplicated in the same Ref. Gr – this error occurs.

Hitachi air conditioner error code 36 (system)

Meaning:

The indoor unit combination is incorrect.

Cause of error:

This error occurs when the indoor unit is designed for R22.

Hitachi air conditioner error code 38 (system)

Meaning:

The protective circuit is abnormal in the outdoor unit.

Cause of error:

It happens due to failure of the protection detecting device or incorrect wiring of the outdoor PCB.

Hitachi air conditioner error code 39 (compressor)

Meaning:

There is an abnormality of running current at a constant speed compressor.

Cause of error:

The problem occurs due to failure of the current sensor, failure of instantaneous power, blown fuse, voltage drop, over-current, and abnormal power supply.

Hitachi air conditioner error code 3A (outdoor unit)

Meaning:

There is an abnormality in the capacity of the outdoor unit.

Cause of error:

The error occurs when the outdoor unit capacity is > 54HP.

Hitachi air conditioner error code 3B (outdoor unit)

Meaning:

The setting of the outdoor unit model’s combination voltage is incorrect.

Cause of error:

This error is caused due to incorrect settings of the sub-unit and main unit, combination, or voltage.

Hitachi air conditioner error code 3D (outdoor unit)

Meaning:

There’s an abnormality in transmission between the main unit and the sub-unit.

Cause of error:

The problem occurs due to PCB failure, or incorrect, broken, and disconnected wiring.

Hitachi air conditioner error code 43 (protection device)

Meaning:

Activation of the low-pressure decrease protection device.

Cause of error:

The error is caused by a defective compressor which includes a failure of the inverter, a failure of the compressor, and a loose power supply connection.

Hitachi air conditioner error code 44 (protection device)

Meaning:

Activation of the low-pressure increase protection device.

Cause of error:

It occurs due to the locking of the expansion valve (loose connector), high temperature at heating, and overload at cooling.

Hitachi air conditioner error code 45 (protection device)

Meaning:

Activation of a high-pressure increase protection device.

Cause of error:

The error is caused by inert gas mixing, pipe clogging, overload operation (like short-pass, clogging), and excessive refrigerant.

Hitachi air conditioner error code 47 (protection device)

Meaning:

Activation of a low-pressure decrease protection device. It is also known as vacuum operation protection.

Cause of error:

The problem is due to the locking of the expansion valve at the open position (loose connector), refrigerant piping, insufficient refrigerant, and clogging.

Hitachi air conditioner error code 48 (protection device)

Meaning:

Activation of inverter over-current protection device.

Cause of error:

This error happens due to compressor failure or overload operation.

Hitachi air conditioner error code 51 (sensor)

Meaning:

The inverter current sensor is abnormal.

Cause of error:

Error is due to failure of the current sensor.

Hitachi air conditioner error code 53 (inverter)

Meaning:

The inverter error signal is detected.

Cause of error:

When the driver IC error signal (protection for low voltage, short circuit, and over-current) is detected, this error code appears.

Hitachi air conditioner error code 54 (inverter)

Meaning:

There is an abnormality or increase in inverter fin temperature.

Cause of error:

Failure of the fan motor, clogging of the heat exchanger, and abnormal inverter fin thermistor can cause this error.

Hitachi air conditioner error code 55 (inverter)

Meaning:

Failure of inverter

Cause of error:

Failure of the inverter PCB causes this error.

Hitachi air conditioner error code 57 (fan controller)

Meaning:

Activation of fan controller protection OR abnormality of the fan motor.

Cause of error:

When the driver IC error signal (protection for low voltage, short circuit, and over-current) is detected, this error code appears. It can also happen due to instantaneous over-current.

Hitachi air conditioner error code 5A (fan controller)

Meaning:

The fan controller fin temperature is abnormal.

Cause of error:

It occurs due to fan motor failure, fin thermistor failure, and clogging of the heat exchanger.

Hitachi air conditioner error code 5B (fan controller)

Meaning:

Activation of overcurrent protection

Cause of error:

It happens due to fan motor failure.

Hitachi air conditioner error code 5C (fan controller)

Meaning:

There is an abnormality in the fan controller sensor or the fan motor.

Cause of error:

The error is caused due to failure of the current sensor, low voltage, instantaneous overcurrent, earth fault, an increase in fin temperature, and abnormality of the fan motor.

Hitachi air conditioner error code EE (compressor)

Meaning:

It is a compressor protection alarm that cannot be reset from the remote controller.

Cause of error:

This error appears when the following error codes occur 3 times in 6 hours:

Error code 02, 07, 08, 39, 43, 45, and 47.

Hitachi air conditioner error code B1 (Outdoor Unit No. Setting)

Meaning:

The setting of the unit and refrigerant cycle no. is incorrect. Or the outdoor (Unit No.) setting is incorrect.

Cause of error:

When a number over 64 is set for address or refrigerant cycle, this error occurs.

Hitachi air conditioner error code B5 (Outdoor Unit No. Setting)

Meaning:

The indoor unit connection number setting is incorrect.

Cause of error:

 If more than 17 units (non-corresponding to H-LINK II) are connected to one system, it leads to this error.

Hitachi air conditioner error code E0

Description:

Malfunction of the water pump.

Hitachi air conditioner error code E1

Description:

Compressor’s high-pressure protection

Hitachi air conditioner error code E2

Description:

Anti-freeze protection (indoor)

Hitachi air conditioner error code E3

Description:

Compressor’s low-pressure protection

Hitachi air conditioner error code E4

Description:

It is caused due to air discharge and high-temperature protection of the compressor.

Hitachi air conditioner error code E5

Description:

Inverter error OR overload protection of compressor cause this error.

Hitachi air conditioner error code E6

Description:

It happens due to communication malfunction.

Hitachi air conditioner error code E8

Description:

Indoor fan protection leads to this error.

Hitachi air conditioner error code E9

Description:

It is caused due to water flow protection.

Hitachi air conditioner error code F0

Description:

This happens when the indoor environment sensor at the air return vent malfunctions.

Hitachi air conditioner error code F1

Description:

When the evaporator sensor stops working, error F1 occurs.

Hitachi air conditioner error code F2

Description:

When the condenser sensor stops working, error F2 occurs.

Hitachi air conditioner error code F3

Description:

A malfunction of the outdoor environment sensor leads to this error.

Hitachi air conditioner error code F4

Description:

When the air discharge sensor stops working, it causes this error.

Hitachi air conditioner error code F5

Description:

The environment sensor on the displayer has malfunctioned.

Hitachi air conditioner error code EH

Description:

The auxiliary electric heater has malfunctioned.

Hitachi air conditioner error code H1

Description:

There is an indoor unit fault.

Hitachi air conditioner error code H2

Description:

This problem is related to the indoor ambient temperature.

Hitachi air conditioner error code H3

Description:

It happens due to indoor coil temperature.

Hitachi air conditioner error code H4

Description:

It is related to the indoor setting temperature.

Hitachi air conditioner error code FE

Description:

The communication between the main control board and the wiring remote controller has a fault.

Hitachi air conditioner error code ER

Description:

The communication between the main control board and the display board has a fault.

Hitachi air conditioner error code P01

Description:

The error is due to control protection for pressure ratio.

Hitachi air conditioner error code P02

Description:

The error is due to high-pressure increase protection.

Hitachi air conditioner error code P03

Description:

The error is due to the inverter current protection.

Hitachi air conditioner error code P04

Description:

The error is due to the inverter fin temperature increase protection.

Hitachi air conditioner error code P05

Description:

The error is due to discharge gas temperature increase protection at the top of the compressor.

Hitachi air conditioner error code P06

Description:

The error is due to low-pressure decrease protection.

Hitachi air conditioner error code P09

Description:

The error is due to high-pressure decrease protection.

Hitachi air conditioner error code P0A

Description:

Demand current protection control

Hitachi air conditioner error code P0D

Description:

This error is caused by low-pressure increase protection.

Hitachi air conditioner error code P11

Description:

This error is caused by the pressure ratio decrease retry.

Hitachi air conditioner error code P12

Description:

This error is caused by low-pressure increase retry.

Hitachi air conditioner error code P13

Description:

This error is caused by high-pressure increase retry.

Hitachi air conditioner error code P14

Description:

This error is caused by constant speed compressor overcurrent retry.

Hitachi air conditioner error code P15

Description:

This error is caused by low-pressure decrease retry OR discharge gas temperature increase retry.

Hitachi air conditioner error code P16

Description:

This error is caused by discharge gas superheat decrease retry.

Hitachi air conditioner error code P17

Description:

The error is due to an inverter anomaly retry.

Hitachi air conditioner error code P18

Description:

The error is due to inverter failure retry OR abnormal inverter voltage retry.

Hitachi air conditioner error code P26

Description: The error is due to high-pressure decrease retry.

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