Daikin Air Conditioner Error Codes

Air conditioner manufacturers often include error codes in their manuals for user reference. If you no longer have the manual for your unit, check our list below for the list of Daikin error codes by indoor or outdoor unit.

Indoor Unit Error Codes

Here are some possible error codes that you may encounter with your Daikin air conditioner’s indoor unit:

• A0: The external protection device is activated, connected to the terminal strip
• A1: Malfunctioning Printed Circuit Board (PCB) - indoor unit
• A3: Drain Level Control System Abnormality
• A4: Malfunction of the freeze-protection feature
• A5: High pressure control in heating; freeze-up protection control in cooling
• A6: Malfunctioning fan motor
• A7: Malfunctioning swing flap motor
• A8: Malfunction in the power supply, or AC input overcurrent
• A9: Malfunction in the electronic expansion valve
• AA: Heater is overheating
• AC: Low water level
• AE: No water supply
• AF: Malfunctioning humidifier system
• AH: Malfunction of the dust collector in the air cleaner
• AJ: Malfunction of the capacity setting - indoor unit Printed Circuit Board (PCB)
• C0: Malfunctioning sensor system
• C1: Failure of transmission - between indoor unit PCB and sub PCB
• C3: Abnormal water level sensor resistance
• C4: Malfunctioning liquid pipe thermistor for heat exchanger
• C5: Malfunctioning gas pipe thermistor for heat exchanger
• C6: Malfunctioning fan motor sensor or fan control driver
• C7: Faulty front panel driving motor
• C8: Malfunctioning input current sensor system
• C9: Malfunction in the suction air thermistor
• CA: Malfunction in the discharge air thermistor
• CC: Malfunctioning humidity sensor system
• CE: Abnormal radiation thermistor resistance
• CF: Malfunctioning high pressure switch
• CJ: Abnormality in the room temperature thermistor of the remote controller

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Outdoor Unit Error Codes

Here are the possible Daikin error codes that may show up on your air conditioner’s outdoor unit:

• E0: Protection devices activated
• E1: Defective Printed Circuit Board (PCB) - outdoor unit
• E2: Missing earth leakage detection core
• E3: Actuation of High Pressure Switch (HPS)
• E4: Actuation of Low Pressure Switch (LPS)
• E5: Inverter compressor motor overheating
• E6: STD compressor motor overcurrent/lock
• E7: Malfunctioning outdoor unit fan motor system
• E8: Overcurrent of inverter compressor
• E9: Malfunctioning electronic expansion valve coil
• EA: Malfunctioning four way valve or cool/heat switch
• EC: Malfunction in the entering water temperature
• EE: Malfunctioning drain water level
• EF: Malfunction of thermal storage unit
• EH: Malfunctioning thermal storage unit
• EJ: Malfunctioning cooling water pump
• F3: Malfunction in discharge pipe temperature
• F4: Wet alarm
• F6: Abnormal high pressure or refrigerant overcharged
• FA: Abnormal high pressure actuation of HPS
• FE: Abnormal pressure
• FF: Abnormal level or shortage of oil
• FH: Abnormal refrigerant temperature
• FJ: Abnormal exhaust temperature of engine
• H0: Malfunctioning sensor system of compressor
• H1: Malfunctioning room temperature sensor or humidifier unit damper
• H2: Malfunction of power supply sensor
• H3: Malfunctioning high pressure switch (HPS)
• H4: Malfunctioning low pressure switch (LPS)
• H5: Malfunctioning compressor motor overload thermistor
• H6: Malfunctioning position detection sensor
• H7: Malfunctioning outdoor unit fan motor signal
• H8: Malfunctioning compressor input (CT) system
• H9: Malfunctioning outdoor air thermistor
• HA: Malfunction of discharge air thermistor
• HC: Malfunctioning hot water temperature thermistor
• HF: Alarm in thermal storage unit or storage controller
• HJ: Malfunctioning thermal storage tank water level
• J0: Miswiring of thermistor
• J1: Malfunctioning pressure sensor
• J2: Malfunctioning current sensor of compressor
• J3: Malfunction in the discharge pipe thermistor
• J4: Malfunction of the low pressure equivalent saturated temperature sensor system
• J5: Malfunction in the suction pipe thermistor
• J6: Malfunction in the heat exchanger thermistor
• J7/J8/J9: Malfunction in the thermistor - refrigerant circuit
• JA: Malfunctioning high pressure sensor
• JC: Malfunctioning low pressure sensor
• JE: Malfunctioning oil pressure sensor or sub-tank thermistor
• JF: Malfunctioning oil level sensor or heating heat exchanger thermistor
• JH: Malfunction of oil temperature thermistor
• L0: Malfunction of the inverter system
• L1: Malfunction of inverter PCB
• L3: EL. COMPO. Box temperature rise
• L4: Malfunction of inverter radiation temperature rise
• L5: Inverter instantaneous overcurrent - DC output
• L6: Inverter instantaneous overcurrent - AC output
• L7: Outdoor total input overcurrent
• L8: Malfunction of overcurrent inverter compressor
• L9: Malfunction of inverter compressor startup error
• LA: Malfunction of power transistor
• LC: Malfunction of connection between control and inverter PCB
• M1: Malfunction of central remote controller PCB
• M8: Malfunction of connection between optional controllers for centralized control
• MA: Improper combination of optional controllers for centralized control
• MC: Address duplication; improper setting
• P0: Shortage of refrigerant amount in the thermal storage unit
• P1: Power voltage imbalance or inverter PCB
• P2: Automatic refrigerant charge operation stop
• P3: Malfunction of thermistor in switch box
• P4: Malfunction of radiation temperature sensor
• P8: Heat exchanger freezing protection during automatic refrigerant charging
• P9: Malfunction of fan motor in the humidifier unit
• P9: Automatic refrigerant charge operation completed
• PA: Refrigerant cylinder during automatic refrigerant charging
• PA: Broken wire of heater in the humidifier unit
• PC: Refrigerant cylinder during automatic refrigerant charging
• PE: Automatic refrigerant charge operation nearly completed
• PH: Refrigerant cylinder during automatic refrigerant charging
• PJ: Malfunction of transmission between inverter and fan driver

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System Error Codes

Here are the possible error codes that may indicate an issue within your air conditioning system:

• U0: Shortage of refrigerant
• U1: Reverse phase
• U2: Defect of power supply voltage or power failure
• U3: Check operation not executed
• U4: Disrupted transmission between indoor and outdoor unit
• U5: Disrupted of transmission between indoor unit and remote
• U6: Malfunction of transmission between indoor units
• U7: Malfunction of transmission between outdoor units
• U8: Malfunction of transmission between remote controllers
• U9: System transmission error between indoor and outdoor
• UA: Combination error of indoor/BS/outdoor units
• UC: System address duplication of central controllers
• UE: System transmission error between indoor and central
• UF: System refrigeration system not set, or
• system terminals 1 and 3 crossed
• UJ: Malfunctioning transmission (accessory device)

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Other Error Codes

Here are some other Daikin error codes that you may also encounter:

• 70: System number 2 compressor overheat
• 71: System number 2 compressor overcurrent
• 72: System number 2 fan motor overcurrent
• 73: System number 2 actuation of high pressure switch (HPS)
• 74: System number 2 actuation of low pressure switch (LPS)
• 75: System number 2 malfunction of low pressure sensor
• 76: System number 2 malfunction of high pressure sensor
• 77: System number 1 malfunction of fan inter lock
• 78: System number 2 malfunction of fan inter lock
• 7A: System number 2 malfunction of compressor current sensor
• 7C: Malfunction of pump inter lock
• 80: Malfunction of entering water temperature thermistor
• 81: Malfunction of leaving water temperature thermistor or drain pipe heater
• 82: System number 1 malfunction of refrigerant thermistor
• 83: System number 2 malfunction of refrigerant thermistor
• 84: System number 1 malfunction of heat exchanger thermistor
• 85: System number 2 malfunction of heat exchanger thermistor
• 86: System number 1 malfunction of discharge pipe thermistor
• 88: System number 2 malfunction of discharge pipe temperature
• 89: Malfunction of brazed-plate heat exchanger freezing
• 8A: Malfunction of dehumidification or leaving water temperature thermistor
• 8E: System number 1 malfunction of suction pipe thermistor 1 for heating
• 8F: System number 1 malfunction of suction pipe thermistor 2 for heating
• 8H: Abnormal hot water high temperature
• 90: Abnormal chilled water quantity or abnormal AXP
• 91: System number 2 malfunction of electronic expansion valve
• 92: System number 2 malfunction of suction pipe thermistor
• 95: System number 1 malfunction of inverter system
• 96: System number 2 malfunction of inverter system
• 97: Malfunction of thermal storage unit
• 98: Malfunction of thermal storage brine pump
• 99: Malfunction of thermal storage brine tank
• 9E: System number 2 malfunction of suction pipe thermistor for heating
• 9F: System number 2 malfunction of suction pipe thermistor 2 for heating

For more information, feel free to refer to these websites for further references:

• https://www.daikin.com/-/media/Project/Daikin/daikin_com/products/ac/services/error_codes/pdf/sm-ts3_p1-6_errorcode-pdf.pdf?rev=-1&hash=EB9A47B35985182BC51091ECC254E40F
• https://www.daikinindia.com/product-services/product-services/error-codes
• https://www.daikin.com/products/ac/services/error_codes

Understanding what your air conditioner’s error code means is the first step to successfully resolving the issue. The best way to troubleshoot the problem is to book an AC repair and maintenance appointment and have a professional HVAC technician inspect your air conditioner. Aside from easily diagnosing the source of the problem, a technician will also be able to make the best recommendations to get your unit up and running once again.