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Daikin Error Codes & Troubleshooting
Daikin Error Codes & Troubleshooting
Daikin is a leading global air conditioning manufacturer known for energy-efficient and reliable systems.
Error Code: A0
External protection device activated
Troubleshooting Steps:
Check external safety devices, circuit breakers, and wiring connections. Reset if necessary.
Error Code: A1
PCB (printed circuit board) defect
Troubleshooting Steps:
Main control board malfunction. Requires professional inspection and possible replacement.
Error Code: A3
Drain pan full (overflowing)
Troubleshooting Steps:
Check drain hose for blockages. Clean drain pan and ensure proper drainage.
Error Code: A5
Heat exchanger freeze protection
Troubleshooting Steps:
System detected potential freezing conditions. Check refrigerant levels and airflow.
Error Code: A6
Fan motor defect
Troubleshooting Steps:
Indoor or outdoor fan motor malfunction. Check for obstructions and motor operation.
Error Code: A7
Swing motor fault
Troubleshooting Steps:
Swing motor malfunction. Check motor operation and remove obstructions.
Error Code: A8
Overcurrent detection
Troubleshooting Steps:
Excessive current detected. Check electrical connections and component operation.
Error Code: A9
Electronic expansion valve fault
Troubleshooting Steps:
EEV malfunction. Professional diagnosis and replacement required.
Error Code: AH
Air purification unit fault
Troubleshooting Steps:
Air purification system malfunction. Check unit operation and connections.
Error Code: C0
Sensor fault (general)
Troubleshooting Steps:
General sensor malfunction. Multiple sensors may need inspection.
Error Code: C1
Heat exchanger frost protection sensor
Troubleshooting Steps:
Frost protection sensor malfunction. Check sensor and defrost operation.
Error Code: C4
Heat exchanger (indoor unit) sensor abnormality
Troubleshooting Steps:
Temperature sensor on indoor heat exchanger is faulty. Sensor replacement required.
Error Code: C5
Heat exchanger (outdoor unit) sensor abnormality
Troubleshooting Steps:
Temperature sensor on outdoor heat exchanger is faulty. Professional diagnosis needed.
Error Code: C7
Outdoor unit heat exchanger defrosting sensor abnormality
Troubleshooting Steps:
Defrost sensor malfunction. May cause improper defrost operation in heat pump mode.
Error Code: C9
Outdoor unit suction air temperature sensor abnormality
Troubleshooting Steps:
Ambient temperature sensor fault. Check sensor wiring and connections.
Error Code: CA
Suction air temperature sensor fault
Troubleshooting Steps:
Return air temperature sensor malfunction. Check sensor operation.
Error Code: CC
Humidity sensor fault
Troubleshooting Steps:
Humidity sensor malfunction. Check sensor operation and connections.
Error Code: CJ
Remote controller temperature sensor fault
Troubleshooting Steps:
Remote controller temperature sensor error. Check remote and sensor.
Error Code: E1
Indoor unit PCB defect
Troubleshooting Steps:
Indoor unit control board failure. Requires professional replacement.
Error Code: E3
High pressure switch activation
Troubleshooting Steps:
System pressure too high. Check for refrigerant overcharge or airflow restrictions.
Error Code: E4
Low pressure switch activation
Troubleshooting Steps:
System pressure too low. Check for refrigerant leaks or undercharge.
Error Code: E5
Outdoor unit motor overcurrent
Troubleshooting Steps:
Outdoor fan motor drawing excessive current. Check for mechanical obstructions.
Error Code: E6
Compressor motor lock or overcurrent
Troubleshooting Steps:
Compressor fault. Immediate professional attention required to prevent damage.
Error Code: E7
Outdoor unit fan motor lock or overcurrent
Troubleshooting Steps:
Outdoor fan motor jammed or overloaded. Check for debris and motor operation.
Error Code: E8
Overcurrent detected
Troubleshooting Steps:
General overcurrent condition. Check electrical connections and component operation.
Error Code: E9
Electronic expansion valve fault
Troubleshooting Steps:
EEV circuit malfunction. Professional diagnosis and repair required.
Error Code: F3
Discharge pipe temperature too high
Troubleshooting Steps:
Compressor discharge temperature excessive. Check refrigerant charge and system operation.
Error Code: F6
Refrigerant pressure too high
Troubleshooting Steps:
High pressure fault. System may have overcharge or blocked condenser.
Error Code: H0
Sensor abnormality
Error Code: H1
Defrost sensor fault
Error Code: H3
High pressure switch fault
Troubleshooting Steps:
High pressure switch malfunction or activation. Check system pressures.
Error Code: H4
Low pressure switch fault
Troubleshooting Steps:
Low pressure switch malfunction. Check refrigerant levels and switch operation.
Error Code: H6
Position detection sensor fault
Troubleshooting Steps:
Sensor position error. Recalibration or replacement may be required.
Error Code: H7
Fan position sensor fault
Troubleshooting Steps:
Fan position detection error. Check fan motor and sensor operation.
Error Code: H8
CT (current transformer) abnormality
Troubleshooting Steps:
Current sensing circuit fault. Professional electrical diagnosis required.
Error Code: H9
Outdoor air temperature sensor abnormality
Troubleshooting Steps:
Outdoor ambient sensor fault. Check sensor and wiring connections.
Error Code: J3
Discharge pipe temperature sensor abnormality
Error Code: J6
Heat exchanger temperature sensor abnormality
Troubleshooting Steps:
Heat exchanger temperature sensor malfunction. Affects system efficiency.
Error Code: J7
Suction pipe temperature sensor fault
Troubleshooting Steps:
Suction line temperature sensor malfunction. Check sensor operation.
Error Code: J8
Liquid pipe temperature sensor fault
Troubleshooting Steps:
Liquid line temperature sensor malfunction. Professional diagnosis needed.
Error Code: L3
Electrical box temperature rise
Troubleshooting Steps:
Control box overheating. Check ventilation and electrical connections.
Error Code: L4
Inverter radiator temperature rise
Troubleshooting Steps:
Inverter heat sink overheating. Check cooling and component operation.
Error Code: L5
Compressor motor temperature rise
Troubleshooting Steps:
Compressor overheating. Check refrigerant levels and system operation.
Error Code: L8
Inverter circuit overheating
Troubleshooting Steps:
Inverter circuit overheating. Check cooling system and ventilation.
Error Code: LC
Refrigerant line temperature sensor fault
Troubleshooting Steps:
Refrigerant line sensor malfunction. Check sensor and connections.
Error Code: P1
Phase detection abnormality
Error Code: P3
Electrical box temperature sensor fault
Troubleshooting Steps:
Control box temperature sensor malfunction. Check sensor operation.
Error Code: P4
Inverter radiator temperature sensor abnormality
Error Code: P7
Outdoor unit total current sensor fault
Troubleshooting Steps:
Current sensor malfunction. Check electrical connections and sensor.
Error Code: PJ
Compressor overload or overcurrent
Troubleshooting Steps:
Compressor protection activated. System requires immediate professional attention.
Error Code: U0
Refrigerant shortage
Troubleshooting Steps:
Low refrigerant detected. Check for leaks and recharge system if needed.
Error Code: U1
Reverse phase or phase loss
Troubleshooting Steps:
Power supply phase error. Check electrical connections and phase sequence.
Error Code: U2
Voltage drop or power supply abnormality
Troubleshooting Steps:
Insufficient power supply voltage. Check electrical connections and supply voltage.
Error Code: U3
Control signal error
Error Code: U4
Communication abnormality
Troubleshooting Steps:
Communication error between indoor and outdoor units. Check connecting cables.
Error Code: U5
Remote control reception error
Error Code: U7
Remote controller communication error
Troubleshooting Steps:
Remote controller communication fault. Check controller and connections.
Error Code: U8
Main remote controller and sub controller conflict
Troubleshooting Steps:
Controller conflict detected. Check controller settings and connections.
Error Code: UA
Central control and local control conflict
Error Code: UF
Gas shortage
Troubleshooting Steps:
Refrigerant shortage detected. Professional leak detection and recharge required.
Error Code: UH
System setting error
Troubleshooting Steps:
System configuration error. Check system settings and parameters.
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