Hitachi AC Error Codes and Troubleshooting

AC BrandsHitachi
Error CodesTrouble
P01Pressure ratio protection control
P02High pressure increase protection
P03Inverter current protection
P04Inverter fin temperature increase protection
P05Discharge gas temperature increase protection at the upper part of the compressor
P06Low pressure decrease protection
P09High pressure decrease protection
P0ADemand current protection control
P0dLow pressure increase protection
P11Pressure ratio decrease retry
P12Low pressure increase retry
P13High pressure increase retry

Code: 01

Content of Abnormality: Tripping of Protection Device

Leading Cause: Failure of Fan Motor, Drain Discharge, PCB, Relay

Code: 02

Content of Abnormality: Tripping of Protection Device

Leading Cause:  Activation of PSH

Code: 03

Content of Abnormality: Abnormality between Indoor (or outdoor) and Outdoor (or Indoor)

Leading Cause:  Incorrect Wiring. Failure of PCB. Tripping of Fuse. Power Supply OFF.

Code: 04

Content of Abnormality: Abnormality between Inverter and Control PCB

Leading Cause: Failure in Transmission between PCBs

Code: 05

Content of Abnormality: Abnormality of Power Source Wiring

Leading Cause: Reverse Phase Incorrect Wiring

Code: 06

Content of Abnormality: Voltage Drop by Excessively Low or High Voltage to Outdoor Unit

Leading Cause: Voltage Drop of Power Supply, Incorrect Wiring or Insufficient Capacity of Power Supply Wiring

Code: 07

Content of Abnormality: Decrease in Discharge Gas Superheat

Leading Cause:  Excessive Refrigerant Charge, Expansion Valve Open Lock

Code: 08

Content of Abnormality:  Increase in Discharge Gas Temperature

Leading Cause: Insufficient Refrigerant. Ref. Leakage, Clogging or Expansion Valve Close Lock

Code: 09

Content of Abnormality: Tripping of Protection Device

Leading Cause: Failure of Fan Motor

Code: 11

Content of Abnormality:  Inlet Air Thermistor

Leading Cause: Failure of Thermistor, Sensor, Connection

Code: 12

Content of Abnormality: Outlet Air Thermistor

Leading Cause: Failure of Thermistor, Sensor, Connection

Code: 13

Content of Abnormality: Freeze Protection Thermistor

Leading Cause: Failure of Thermistor, Sensor, Connection

Code: 14

Content of Abnormality: Gas Piping Thermistor

Leading Cause: Failure of Thermistor, Sensor, Connection

Code: 19

Content of Abnormality: Failure of Fan Motor

Leading Cause: Failure of Fan Motor

Code: 21

Content of Abnormality: High Pressure Sensor

Leading Cause: Failure of Thermistor, Sensor, Connection

Code: 22

Content of Abnormality: Outdoor Air Thermistor

Leading Cause: Failure of Thermistor, Sensor, Connection

Code: 23

Content of Abnormality: Discharge Gas Thermistor on Comp

Leading Cause: Failure of Thermistor, Sensor, Connection

Code: 24

Content of Abnormality: Evaporating Thermistor


Leading Cause: Failure of Thermistor, Sensor, Connection

Code: 29

Content of Abnormality: Low Pressure Sensor

Leading Cause: Failure of Thermistor, Sensor, Connection

Code: 30

Content of Abnormality: Incorrect Wiring Connection

Leading Cause: Incorrect Wiring Connection between Outdoor Unit, CH Unit and Indoor Unit

Code: 31

Content of Abnormality: Incorrect Setting of Outdoor and Indoor Unit

Leading Cause: Incorrect Setting of Capacity Code

Code: 32

Content of Abnormality: Abnormal Transmission of Other Indoor Unit

Leading Cause: Failure of Power Supply, PCB in Other Indoor Unit. Failure of Other Indoor Unit of the Same Refrigerant Cycle.

Code: 35

Content of Abnormality: Incorrect Setting in Indoor/Outdoor Unit No.

Leading Cause: Existence of the same Indoor Unit No. in the same refrigerant cycle

Code: 38

Content of Abnormality: Abnormality of Protective Circuit in Outdoor Unit

Leading Cause: Failure of Indoor Unit PCB. Incorrect Wiring Connection to PCB in Outdoor Unit

Code: 39

Content of Abnormality: Abnormality of Running Current at Constant Compressor

Leading Cause: Overcurrent, Melted Fuse of Failure of Current Sensor

Code: 43

Content of Abnormality: Pressure Ratio Decrease Protection Activating

Leading Cause: Failure of Compressor, Inverter

Code: 44

Content of Abnormality: Low Pressure Increase Protection Activating

Leading Cause: Overload to Indoor in Cooling, High Temperature of Outdoor Air in Heating Expansion Valve Open Lock

Code: 45

Content of Abnormality: High Pressure Increase Protection Activating

Leave a Reply

Your email address will not be published. Required fields are marked *

Fill out this field
Fill out this field
Please enter a valid email address.
You need to agree with the terms to proceed

You May Also Like

hyundai ac error codes
Hyundai Air Conditioner Error Codes
haier ac error codes
Haier AC Error Codes

Subscribe to our Youtube Channel

Must Read

Menu