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Air Conditioning Fault Codes Guide: Diagnose and Fix Issues Fast

Air Conditioning Fault Codes Guide: Diagnose and Fix Issues Fast

Dec 23 ,2024   back to blog
 

Fault Code Tables for Leading Air Conditioning Brands

Below are detailed fault code tables for Toshiba, Daikin, and Mitsubishi air conditioning units. These tables allow you to self-diagnose your air conditioning system by matching the displayed fault code with the descriptions below.

Toshiba Fault Codes

Code Description Possible Causes Suggested Action
E01 Indoor unit communication error Wiring fault, control PCB Check wiring connections and inspect control PCB.
E03 Outdoor unit communication error Wiring issues, outdoor PCB Inspect outdoor unit wiring; test outdoor PCB functionality.
E04 High-pressure error Blocked airflow, condenser coil Clean the condenser coil and ensure proper airflow.
E06 Compressor overcurrent Electrical fault, compressor overload Inspect electrical components; check compressor overload relay.
E07 Indoor fan motor fault Fan motor failure, wiring Inspect fan motor wiring and replace the motor if necessary.
F03 Outdoor fan motor fault Fan motor failure, PCB fault Inspect fan motor and outdoor PCB.
P10 Compressor discharge temperature too high Refrigerant level, compressor overload Check refrigerant levels and inspect compressor operation.

Daikin Fault Codes

Code Description Possible Causes Suggested Action
U0 Low refrigerant level Refrigerant leak, incorrect charge Check for refrigerant leaks and recharge the system.
E1 Circuit board malfunction Faulty PCB, wiring issue Inspect PCB and wiring connections; replace PCB if necessary.
J6 Indoor fan motor fault Fan motor failure, wiring Inspect indoor fan motor wiring and replace if required.
L5 Overcurrent to compressor Compressor fault, electrical issues Inspect compressor; check for electrical issues.
P1 High pressure protection Blocked condenser coil, poor airflow Clean condenser coil; ensure adequate airflow.
C4 Faulty heat exchanger sensor Sensor failure, wiring fault Check heat exchanger sensor wiring and functionality.
U2 Power supply issue Voltage fluctuation, power outage Check voltage levels; ensure stable power supply.
A1 Sensor malfunction Faulty thermistor, wiring Inspect the thermistor and wiring for damage.
H3 Compressor overheat High discharge temperature, low refrigerant Inspect refrigerant levels and compressor operation.
E5 Overcurrent detected Compressor fault, electrical issue Inspect the compressor and check electrical components.
J3 Temperature sensor fault Wiring issue, sensor failure Inspect wiring and replace the sensor if necessary.
L4 Compressor locked Compressor failure, electrical issue Inspect compressor and electrical wiring.

Mitsubishi Fault Codes

Code Description Faulty Components Diagnosis
403 Communication fault between boards Inverter board, control board, wiring Check connections between control and inverter boards.
900 Lossnay unit in test run Lossnay unit settings Verify if the Lossnay unit's test run mode is active.
1102 High compressor discharge temperature Compressor, refrigerant levels Inspect refrigerant levels; check for blockages or compressor issues.

Fujitsu Fault Codes

Code Description Possible Causes Suggested Action
E00 Indoor unit malfunction Sensor fault, PCB issue Inspect indoor unit sensors and PCB.
E01 Outdoor unit malfunction Wiring issue, PCB failure Check outdoor unit wiring and PCB.
E02 Compressor high temperature Blocked airflow, refrigerant issue Ensure proper airflow; check refrigerant levels.
E03 Indoor fan motor fault Fan motor failure, wiring issue Inspect indoor fan motor and wiring.
E04 Outdoor fan motor fault Fan motor failure, PCB issue Inspect outdoor fan motor and PCB.
E05 Compressor overcurrent Electrical fault, compressor issue Inspect electrical components and compressor.
E06 Sensor error Wiring fault, damaged sensor Check sensor wiring and replace if needed.
E07 High pressure protection Blocked condenser, refrigerant issue Clean condenser and check refrigerant levels.
E08 Low pressure protection Refrigerant leak, low charge Check for refrigerant leaks and recharge system.
E09 Thermistor fault Sensor failure, wiring issue Inspect thermistor and wiring.
E10 Drainage issue Blocked drain pipe, pump failure Clean drainage system and inspect pump.

Panasonic Fault Codes

Code Description Possible Causes Suggested Action
E00 Indoor unit malfunction Sensor fault, PCB issue Inspect indoor unit sensors and PCB.
E01 Outdoor unit malfunction Wiring issue, PCB failure Check outdoor unit wiring and PCB.
E02 Compressor temperature high Blocked airflow, refrigerant issue Ensure proper airflow; check refrigerant levels.
E03 Indoor fan motor fault Fan motor failure, wiring issue Inspect indoor fan motor and wiring.
E04 Outdoor fan motor fault Fan motor failure, PCB issue Inspect outdoor fan motor and PCB.
E05 Compressor overcurrent Electrical fault, compressor issue Inspect electrical components and compressor.
E06 Sensor error Wiring fault, damaged sensor Check sensor wiring and replace sensor if needed.
E07 High pressure protection Blocked condenser, refrigerant issue Clean condenser; check refrigerant levels.
E08 Low pressure protection Refrigerant leak, low charge Check for refrigerant leaks and recharge system.
E09 Thermistor fault Sensor failure, wiring issue Inspect thermistor and wiring.
E10 Drainage issue Blocked drain pipe, pump failure Clean drainage system and inspect pump.

LG Fault Codes

Code Description Possible Causes Suggested Action
CH01 Indoor temperature sensor fault Faulty sensor, wiring issue Inspect the temperature sensor and wiring.
CH02 Indoor pipe sensor fault Sensor damage, connection issue Check pipe sensor and ensure secure connections.
CH03 Indoor fan motor error Fan motor failure, wiring issue Inspect fan motor operation and wiring.
CH05 Communication error Wiring fault, PCB malfunction Check communication wiring and PCB.
CH06 Outdoor pipe sensor fault Faulty sensor, wiring issue Inspect outdoor pipe sensor and connections.
CH07 Outdoor fan motor fault Fan motor failure, wiring issue Inspect the outdoor fan motor and wiring.
CH09 High pressure error Blocked condenser, refrigerant issue Clean condenser and check refrigerant levels.
CH10 Low pressure error Refrigerant leak, low charge Inspect refrigerant circuit and recharge the system.
CH12 Compressor overcurrent Electrical fault, compressor issue Inspect electrical components and compressor.
CH21 Thermistor fault Faulty thermistor, wiring issue Check thermistor and wiring for damage.
CH34 Compressor discharge temperature high High load, low refrigerant Inspect refrigerant levels and system load.

Gree Fault Codes

Code Description Possible Causes Suggested Action
E1 High-pressure protection Blocked condenser, overcharge Clean condenser; check refrigerant charge.
E2 Indoor coil freeze protection Low refrigerant, poor airflow Check refrigerant levels; ensure proper airflow.
E3 Low-pressure protection Refrigerant leak, low charge Inspect for leaks and recharge the system.
E4 Compressor discharge protection High temperature, refrigerant issue Check refrigerant levels and compressor operation.
E5 Overcurrent protection Electrical fault, compressor issue Inspect electrical components and compressor.
E6 Communication error Wiring issue, PCB fault Check communication wiring and PCB connections.
E7 Mode conflict Incorrect operation settings Check operation mode settings.
E8 Overload protection High ambient temperature Inspect system for overloading issues.
F0 Refrigerant leakage detection Low refrigerant Check for refrigerant leaks and repair as necessary.
F1 Indoor ambient temperature sensor fault Faulty sensor, wiring issue Inspect sensor wiring and replace sensor if needed.

These fault code tables of the leading brands provide an easy way to identify potential issues with your air conditioning unit. For further assistance, contact Seasonal Control Ltd, your trusted partner for air conditioning repairs and installations in London. ​

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