99 Daikin aircon error codes + troubleshooting

Table of Contents

With all the comfort and convenience of the Daikin air conditioner, it also has another side that is facing issues in the system. The integrated features will display a specific error code that is an indication of the problem occurring in your Daikin aircon system.

As there are many error codes and causes can be different, we have gathered all the error codes ranging from alphabetic series to numbering. We will suggest the best suitable solution to take down the error as well. Always seek professional help if it is necessary to resolve an error without risking your or your system’s health.

Daikin air conditioner error code A0, 60

Causes:

This error is displayed on Daikin AC when/if:

  1. The external protection device connected to the indoor unit’s terminal strip T1-T2 has been activated.
  2. The outdoor fan has stopped working.
  3. The compressor is overheating.
  4. The refrigerant level is less than required or freon gas is polluted.

Solutions:

  1. Turn OFF the AC system and then turn it ON after 5-15 minutes (or until it cools down in case of overheating).
  2. Check the outdoor fan and remove the foreign object if stuck in the blades.
  3. Check the fan motor for malfunctioning. Ask for repair or replacing the fan motor as preferable.
  4. Check the refrigerant level and fill the gas if it’s low.

Daikin air conditioner error code A1

Causes:

This error is displayed on Daikin AC when/if:

  1. The main PCB (Printed Circuit Board) of the indoor unit is malfunctioning.

Solutions:

  1. Contact a technician to inspect the wiring and connection of the main PCB. Repair wires and connectors if needed.
  2. Replace the main PCB if it is defective.

Daikin air conditioner error code A3

Causes:

This error is reported by Daikin AC when/if:

  1. The drainage mechanism is not functioning properly.
  2. The drainage pipe or valve is closed or clogged.
  3. The drainage pipe is bent, broken, or not installed correctly.
  4. The float switch is broken, bent, or defective.
  5. The drain pump is clogged or faulty.

Solutions:

  1. Straighten the pipe if it is bent or replace it if it’s broken.
  2. Clean the piping and valve for any clogging.
  3. Make sure that the drainage pipe is installed in its intended position.
  4. Check the float switch for any issues. Replace the switch if it’s broken.
  5. Contact an HVAC engineer to inspect the drainage pump. Repair or replace it as needed.

Daikin air conditioner error code A4

Causes:

This error is displayed on Daikin AC when/if:

  1. The system freezing protection has been activated or malfunctioned.
  2. The refrigerant is not at the required level.
  3. The water temperature thermistor is faulty.
  4. The water is low and its temperature setting is wrong.

Solutions:

  1. Wait for a few minutes because freeze protection can be resolved after icing on the coils is removed.
  2. Clean the condenser coils and air filters to remove dust and debris build-up.
  3. Check the refrigerant level and ensure it is just perfect.
  4. Ensure that water temperature and level settings are correctly adjusted.
  5. Contact an HVAC engineer to inspect the water temperature thermistor for any faults. Replace the thermistor if it is faulty.                                   

Daikin air conditioner error code A5

Causes:

This error is reported by Daikin AC when/if:

  1. The system has initiated the high-pressure protection or control in HEATING mode.
  2. Freeze-up or defrost protection control has been activated in COOLING mode.

Solutions:

  1. Clean the indoor unit air filters to remove dirt build-up or clogging. Take out if some foreign items are stuck in them.
  2. Check the air filter-related components for any short circuits. Repair or replace the component as needed.
  3. Check the heat exchanger thermistor of the indoor unit for any issues. Replace the thermistor if it is defective.
  4. If still getting the error, inspect the main PCB and replace it if it’s faulty.

Daikin air conditioner error code A6

Causes:

This error is reported by Daikin AC when/if:

  1. The fan motor of the unit is malfunctioning.
  2. The fan motor is under overcurrent protection or overloaded.
  3. The fan motor is faulty or locked.

Solutions:

Contact an HVAC technician to:

  1. Check the fan motor harness. Repair the wiring and fix loose connectors.
  2. Repair pinched wires and loose connectors between the fan motor, power supply, and the main PCB.
  3. Inspect the main PCB for any faults. Replace it if it’s defective.
  4. Check the fan motor and repair or replace it if it’s faulty. 

Daikin air conditioner error code A7

Causes:

This error is displayed on Daikin AC when/if:

  1. The swing flap motor or blades are clogged or stuck.
  2. The swing flap motor is not functioning.

Solutions:

  1. Clean the flap motor blades to remove debris build-up or foreign objects stuck there.
  2. Check the main PCB of the indoor unit and if it’s faulty, replace it.
  3. If the error persists, contact a technician to inspect the swing flap motor for any faults. Repair or replace the motor as needed.

Daikin air conditioner error code A8

Causes:

This error is reported by Daikin AC when/if:

  1. The main power supply of either unit is malfunctioning.

Solutions:

Contact a local technician or an electrician to:

  1. Check the AC input voltages and ensure there is no overcurrent situation.
  2. Ensure that the power cord is properly connected to the wall receptacle.
  3. Ensure that power supply voltages are consistent and in the normal range.
  4. Repair pinched wires or loose connectors of the power supply and main PCB.
  5. If the error persists, inspect the power supply and replace it if it is faulty.

Daikin air conditioner error code A9, E9, 91

Causes:

This error is reported by Daikin AC when/if:

  1. The electronic expansion valve drive of the aircon is not functioning properly.
  2. The electronic expansion valve coil is damaged or faulty.

Solutions:

Contact a local technician to:

  1. Check the electronic expansion valve coil for any defects. Replace the valve if needed.
  2. Inspect the expansion valve for any faults. Replace it if defective.
  3. Check the valve drive wiring and connectors. Ensure connectors are in place and properly connected.
  4. Check the main PCB for any issues. Replace the PCB if it’s faulty.

Daikin air conditioner error code AA

Causes:

This error is displayed on Daikin AC when/if:

  1. The temperature in the heater exceeds its normal limit.
  2. The system has activated the 26WH heater protection to prevent any major damages.

Solutions:

  1. Turn OFF the system and let it cool down before turning it ON again.
  2. Check the voltages and ensure a consistent supply of voltages that is within the required range.
  3. Check the wiring and connectors of the heater and do the immediate repair for pinched wires or loose connectors.
  4. Check the main PCB and replace it, if it is malfunctioning.
  5. If the error persists, inspect the heater for any issues and replace it with a new one if defective.   

Daikin air conditioner error code AF

Causes:

This error is reported by Daikin AC when/if:

  1. The humidifier system of the AC unit is not functioning.

Solutions:

  1. Inspect the humidifier for any water leakages and repair them.
  2. Check the draining piping and ensure they are not bent or broken. Repair them where needed.
  3. Check the swing float switch for issues. Replace the float switch if it’s defective.
  4. Check the main PCB and replace it if it’s faulty.
  5. If still getting the error, seek professional help to repair or replace the humidifier system.

Daikin air conditioner error code AH

Causes:

This error is reported by Daikin AC when/if:

  1. The dust collector for the air cleaner is not working.

Solutions:

  1. Open the dust collector and remove it if something is stuck or causing a clog.
  2. Inspect the wiring and connectors and repair them if they are damaged.
  3. Check the high-voltage power supply unit. Repair or replace it as needed.
  4. Check the insulator part and get it fixed if it is defective.
  5. Check the main PCB of the indoor unit and replace it if it’s faulty.

Daikin air conditioner error code AJ

Causes:

This error is displayed on Daikin AC when/if:

  1. The capacity settings of the indoor unit main PCB are not correct.
  2. The capacity setting adapter is malfunctioning or wasn’t installed in the PCB.

Solutions:

  1. Check the main PCB and ensure that a capacity settings adapter is installed in it. Replace the PCB or install the capacitor if it’s not there.
  2. Check the main PCB for any faults. Replace it if it is faulty.
  3. Check the wiring and connections for any damages. Repair wires and connectors where needed.
  4. Contact an HVAC professional to inspect the adaptor for any issues. Replace it if faulty.

Daikin air conditioner error code C1

Causes:

This error is displayed on Daikin AC when/if:

  1. The transmission is interrupted or completely failed between the main and fan PCB of the indoor unit.
  2. The fan motor control driver’s communications or the transmission failed.
  3. Compunction wiring or connectors are loose.

Solutions:

Contact a technician or an HVAC professional to:

  1. Check and repair the pinched wiring and loose connectors between the indoor unit’s main PCB and fan PCB.
  2. Check the fan motor control driver for any issues. Repair or replace it as needed.
  3. Check the main PCB and fan PCB of indoor units. Replace either PCB if faulty.
  4. If the error persists, inspect the fan motor for malfunctioning. Repair or replace it if needed.                                             

Daikin air conditioner error codes C4, J7, J8

Causes:

This error is displayed on Daikin AC when/if:

  1. The liquid pipe thermistor for the heat exchanger is malfunctioning.
  2. The main PCB of the indoor unit is faulty.

Solutions:

  1. Turn OFF the indoor unit or AC system and then turn it ON after a few seconds.
  2. Check the wiring and connection of the thermistor. Repair the wire harness where it is damaged.
  3. Check the thermistor for any issues. Repair or replace the spare part as needed.
  4. If the error persists, inspect the main PCB for any malfunctioning. Replace the PCB if it’s faulty.

Daikin air conditioner error code C5, J9

Causes:

This error is displayed on Daikin AC when/if:

  1. The gas pipe thermistor for the heat exchanger of the outdoor unit is malfunctioning.
  2. There was an open or short circuit in the outdoor unit’s gas pipe thermistor.
  3. The main PCB of the outdoor unit is faulty.

Solutions:

  1. Check and ensure that the gas pipe thermistor connectors are properly connected to the outdoor unit main PCB.
  2. Check the gas pipe thermistor for any issues. Replace the components if it is faulty.
  3. Inspect the outdoor unit main PCB for any malfunctioning. Replace the PCB if it’s faulty.

Daikin air conditioner error code C6

Causes:

This error is displayed on Daikin AC when/if:

  1. The fan motor control driver is not working.
  2. The fan motor sensor system is defective.
  3. The fan motor is faulty.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code A6”.
  2. Check the sensor for any malfunctioning and if it is faulty, replace it with a new and compatible one.

Daikin air conditioner error code C7

Causes:

This error is displayed on Daikin AC when/if:

  1. The front panel driving motor is faulty.
  2. The shutter motor or shutter limit switch is defective. 
  3. The wiring and connections are damaged or loose.

Solutions:

  1. Clean the blow part and front panel to remove any foreign objects stuck in it.
  2.  Check the shutter limit switch and replace it if it’s faulty.
  3. Check the shutter motor and if it is defective, replace it with a new one.
  4. Check the wiring and connections. Repair the damages and restart the system. If the error remains, replace the wire harness completely.
  5. Check the main PCB for any malfunction. Replace the PCB if it’s faulty.
  6. If still getting the error, replace the shutter or front panel with a new spare part. 

Daikin air conditioner error code C9

Causes:

This error is displayed on Daikin AC when/if:

  1. The suction air thermistor of the AC unit is not working.
  2. There was an open or short circuit in the thermistor for suction air.
  3. The main PCB of the system is faulty.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code C4”.

Daikin air conditioner error code CA

Causes:

This error is displayed on Daikin AC when/if:

  1. The thermistor for the discharge air is malfunctioning.
  2. The thermistor has an open or short circuit.
  3. The wire harness of the discharge air thermistor is damaged or loose. 
  4. The main PCB of the AC unit is faulty.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code C4”.

Daikin air conditioner error code CC

Causes:

This error is displayed on Daikin AC when/if:

  1. The humidity sensor of the unit is malfunctioning.
  2. The sensor is not connected or the harness is damaged.
  3. The main PCB is not functioning properly.

Solutions:

  1. Check the resistance coefficient of the sensor and if it is weak, replace it with a strong and compatible one.
  2. Ensure that the sensor is positioned in its correct place and properly connected to the main PCB.
  3. Repair the damaged wiring harness and loose connections.
  4. If the sensor is still malfunctioning, replace it with a new one.
  5. If the error persists, inspect the main PCB and replace it if it’s faulty.          

Daikin air conditioner error code CJ

Causes:

This error is displayed on Daikin AC when/if:

  1. The thermostat sensor in the remote controller is not working.
  2. The sensor is not connected or the wire harness is damaged.
  3. The remote control PCB is not functioning properly.
  4. The remote control thermistor is faulty.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code CC”.
  2. Inspect the remote control thermistor and replace it if it is malfunctioning.

Daikin air conditioner error code E0

Causes:

This error is displayed on Daikin AC when/if:

  1. The protection devices have been activated.
  2. The wire harness or connectors of the protection device is damaged or loose.
  3. The protection device connected to the PCB of the outdoor unit is unified.

Solutions:

  1. Check the protection device for any malfunction. Repair or replace the device if it’s faulty.
  2. Check the wire harness and ensure that insulation is in place. Repair if damaged.
  3. Check and make sure that the protection device is properly connected to the main PCB. Correct connectors if they are loose.
  4. Check the circuit breaker or earth leakage circuit breakers for tripping. Reset them if there aren’t any other issues.
  5. If the error persists, inspect the main PCB of the outdoor unit. Replace it if it is faulty.

Daikin air conditioner error code E1

Causes:

This error is displayed on Daikin AC when/if:

  1. The outdoor unit’s main PCB (Printed Circuit Board) is malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code A1”.

Daikin air conditioner error code E3, H3, 73

Causes:

This error is displayed on Daikin AC when/if:

  1. The high-pressure switch or HPS has been activated.
  2. Dirt is causing clogging in the suction filters or outdoor unit heat exchanger.
  3. Shortage of refrigerant or water volume in the system.
  4. The high-pressure switch is defective.

Solutions:

  1. Turn OFF the AC unit for a few minutes and then turn it ON again.
  2. Clean the heat exchanger, refrigerant pipes, and air suction filters of the outdoor unit to remove dirt buildup.
  3. Check the refrigerant or water volume in the system. Fill either of the ingredients if they are less than required.
  4. Check the HPS wiring and repair it if it’s damaged.
  5. Clean the high-pressure switch or replace it if it’s faulty.
  6. The main PCB of the outdoor unit is malfunctioning. Replace it if it is faulty.

Daikin air conditioner error code E4, H4, 74

Causes:

This error is displayed on Daikin AC when/if:

  1. The low-pressure switch (LPS) has been activated.
  2. Air filters, heat exchangers, or gas piping are clogged.
  3. The gas level is low in the system.
  4. LPS is defective.
  5. The outdoor unit’s main PCB is malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code E3”.

Daikin air conditioner error code E5, 70

Causes:

This error is displayed on Daikin AC when/if:

  1. The inverter compressor motor is overheating.
  2. The inverter compressor motor is locked.

Solutions:

  1. Turn OFF the system and let it rest until it cools down completely.
  2. Check the gas and refrigerant level and fill it if it’s low. 
  3. Check the wire harness and connectors. Ensure wires are insulated and connectors are properly connected.
  4. Check the 4-way valve and repair it if it is locked or clogged.
  5. Check the main PCB for malfunctioning and replace it if it’s faulty.
  6. Inspect the compressor for any faults. Repair or replace it as suggested by the technician.

Daikin air conditioner error code E6, 71

Causes:

This error is displayed on Daikin AC when/if:

  1. The STD compressor motor is locked or activated overcurrent protection.
  2. The system has detected over-current to system no. 1 compressor (for E6) or system no. 2 compressor (for 71).

Solutions:

  1. Clean the stop valve or EXP valve to remove dirt and clogging.
  2. Replace the stop or EXP valve if it is faulty or broken.
  3. Check the refrigerant level and fill the freon if it is low.
  4. Inspect the STD compressor and seek professional help if it is locked.
  5. If the error persists, inspect the compressor for any faults. Repair or replace it if it’s defective.

Daikin air conditioner error code E7

Causes:

This error is displayed on Daikin AC when/if:

  1. The fan motor of the outdoor unit is malfunctioning.
  2. The outdoor unit fan motor wiring is damaged or connections are loose.
  3. The fan motor driver is defective.
  4. The fan motor is faulty.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code A6”.

Daikin air conditioner error code E8

Causes:

This error is displayed on Daikin AC when/if:

  1. The system has detected over current supply to the inverter compressor.
  2. Overcurrent protection has been activated to prevent any damage to the inverter compressor.

Solutions:

  1. Check the main power cord and ensure it is insulated and properly connected to the wall receptacle.
  2. Check the inverter compressor main circuit capacitor and replace it if it’s defective.
  3. Check the power transistor of the inverter compressor. Replace the transistor if it is malfunctioning.
  4. Check the power supply for any faults. Repair or replace it as needed.
  5. Inspect the outdoor unit main PCB for any faults. Replace the part if needed.

Daikin air conditioner error code EA

Causes:

This error is displayed on Daikin AC when/if:

  1. The 4-way valve of the outdoor unit is not functioning.
  2. The outdoor unit’s main PCB is defective.

Solutions:

  1. Contact an HVAC professional to check the 4-way valve and if it is broken or defective, replace it.
  2. Check the refrigerant level and if it is par low, fill the freon gas.
  3. Check the thermistor for malfunctioning. Replace the part if it’s defective.
  4. If the error persists, inspect the main PCB of the outdoor unit. Replace it if it’s faulty.

Daikin air conditioner error code EC, 80

Causes:

This error is displayed on Daikin AC when/if:

  1. The entering/cooling water temperature is abnormal.
  2. The entering water temperature thermistor is malfunctioning.

Solutions:

  1. Go to the settings and ensure everything is properly adjusted.
  2. Turn OFF the AC system and restart it.
  3. Check the thermistor wiring and PCB wiring for any damages. Repair wires where needed.
  4. Check the thermistor for any malfunction. Replace the thermistor if it’s faulty.
  5. Inspects the main PCB of the unit and replace it if it is faulty.                                  

Daikin air conditioner error code EF, 97

Causes:

This error is displayed on Daikin AC when/if:

  1. The thermal storage unit of the system is malfunctioning.
  2. The PCB is defective.

Solutions:

  1. Contact an HVAC technician to check the electronic expansion valve of the thermal storage unit for any issues. Repair or replace the valve as needed.
  2. Clean the valves if they are clogged with dirt build-up or any other foreign object.
  3. Inspect the thermal storage PCB and replace the components if it is defective.

Daikin air conditioner error code F3, 86, 88

Causes:

This error is displayed on Daikin AC when/if:

  1. The discharge pipe temperature (error code 86 for system no. 2) is abnormal.
  2. Wire harnesses or connections are damaged.
  3. Clogging in refrigerant pipes.

Solutions:

  1. Check the settings and ensure that all temperature components are properly adjusted. Tweak temperature settings to see if the error resolves.
  2. Repair the damaged wire harness and loose connections where needed.
  3. Clean the refrigerant or gas piping in the system. Remove dirt build-up in or on the gas piping. 
  4. Check the refrigerant level and if it is par low, fill the gas.
  5. Inspect the discharge pipe thermistor and if it is at fault, replace it.
  6. Check the main PCB and replace it if it’s faulty. 

Daikin air conditioner error code F6

Causes:

This error is displayed on Daikin AC when/if:

  1. The high pressure is abnormal in the COOLING mode.
  2. The high-pressure switch is malfunctioning.

Solutions:

Contact an HVAC engineer or a local technician to:

  1. Check the fan motor of the outdoor unit. Repair the motor if it’s faulty or replace it at all.
  2. Check the electronic expansion valve and if it is defective, replace it.
  3. Check the thermistor of the heat exchanger for any faults. Replace the thermistor if it is faulty.
  4. Check the wiring and connections of the liquid pipe thermistor and ensure it is connected.
  5. Replace the outdoor unit main PCB if malfunctioning.

Daikin air conditioner error code H0

Causes:

This error is displayed on Daikin AC when/if:

  1. The sensor on the compressor in the outdoor unit is malfunctioning.
  2. The wire harness of the sensor is damaged.
  3. The main PCB of the outdoor unit is defective.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code CC”.

Daikin air conditioner error code H1, 6A

Causes:

This error is displayed on Daikin AC when/if:

  1. The humidifier unit damper of the aircon is not working.
  2. The limit switch is defective.

Solutions:

  1. Check and ensure that the humidifier unit damper is positioned in its intended place.
  2. Check the limit switch and ensure it is not malfunctioning. Replace the switch if faulty.
  3. Check the main PCB and replace it if it’s defective.
  4. If the error persists, inspect the humidifier unit or damper motor. Repair or replace the components as suggested by the technician.

Daikin air conditioner error code H5

Causes:

This error is displayed on Daikin AC when/if:

  1. The overload thermistor of the compressor motor has issues.
  2. The wire harness of the thermistor is damaged.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.
  2. If the error remains even after replacing the thermistor, inspect the compressor for faults. Repair or replace the components as needed.                                      

Daikin air conditioner error code H6

Causes:

This error is displayed on Daikin AC when/if:

  1. The position detection sensor is not operating.
  2. The wire or connection between the sensor and the main PCB is damaged or loose.
  3. The main PCB of the outdoor unit was malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code CC”.
  2. If the error is still there, check the compressor for malfunctioning. Repair or replace the component as needed.

Daikin air conditioner error code H7, 72

Causes:

This error is displayed on Daikin AC when/if:

  1. The fan motor of the outdoor unit (error code 72 for system no. 2) is not functioning properly.
  2. The fan motor signal is not working.
  3. The wire harness is damaged.
  4. The fan motor is defective.

Solutions:

Contact a local technician or an electrician to:

  1. Check the fan motor wiring between the power supply and the main PCB for any damages. Repair the wires and loose connectors where needed.
  2. Repair damaged wires or loose connectors of the fan motor.
  3. Check the fan motor drivers and if it is faulty, replace them.
  4. Inspect the main PCB and replace it if it’s malfunctioning.
  5. If the error persists, repair or replace the fan motor of the outdoor unit as this could be at fault.

Daikin air conditioner error code H8

Causes:

This error is displayed on Daikin AC when/if:

  1. The input system (CT) of the compressor is malfunctioning.
  2. The transistor or reactor is faulty.
  3. The outdoor unit’s main PCB is defective.

Solutions:

Contact a local electrician to:

  1. Check the wiring of the power supply, main PCB, power transistor, reactor, inverter system, and compressor. Repair the wire harness if it is damaged.
  2. Check the power transistor of the outdoor unit. Repair or replace the transistor as needed.
  3. Inspect the outdoor unit compressor reactor and replace it if it’s at fault.
  4. Check the main PCB of the outdoor unit and replace it if it’s malfunctioning.                      

Daikin air conditioner error code H9, 65

Causes:

This error is displayed on Daikin AC when/if:

  1. The air thermistor of the outdoor unit is not working.
  2. The wire harness of the thermistor is broken or loose.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code HC

Causes:

This error is displayed on Daikin AC when/if:

  1. The hot water thermistor of the OTD unit is not operating.
  2. The wire harness and connectors of the thermistor are damaged or loose.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code HF

Causes:

This error is displayed on Daikin AC when/if:

  1. This is an alarm or warning that there are some issues or abnormalities in the thermal storage unit with ice.

Solutions:

  1. Check the thermal storage unit group of the system and ensure its wiring is in place. Repair damaged wire harness where needed.
  2. Go to the settings and make sure that all related settings are properly set. Adjust the settings to see if the error goes away.
  3. Seek professional help to ensure appropriate numbers of thermal storage tanks.
  4. Inspect the thermal storage tank and if it is leaked or has issues, repair or replace it as needed.                           

Daikin air conditioner error code HJ

Causes:

This error is displayed on Daikin AC when/if:

  1. The water level thermal storage tank is abnormal or not working efficiently.
  2. The water level switch is malfunctioning.
  3. The wire harness of the switch and thermal storage tank is damaged.

Solutions:

  1. Check the water level and ensure it is just at a perfect point (not less, not high).
  2. Check the water level switch and ensure it is properly positioned
  3. Ensure that the switch setting is correctly calibrated.
  4. Check the wire harness of the sensor, PCB, and water level switch. Repair the damages where needed.
  5. Inspect the water level detection sensor for any faults. If it’s malfunctioning, replace the sensor or try the solutions suggested for Daikin aircon “Error Code CC”.

Daikin air conditioner error code J1

Causes:

This error is displayed on Daikin AC when/if:

  1. The pressure sensor of the outdoor unit is malfunctioning.
  2. The wire harness of the sensor is damaged.
  3. The main PCB of the outdoor unit is defective.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code CC”.  

Daikin air conditioner error code J2, 7A

Causes:

This error is displayed on Daikin AC when/if:

  1. The OTD compressor current sensor is malfunctioning.
  2. The wire harness of the sensor is damaged.
  3. The main PCB of the outdoor unit is defective.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code CC”.

Daikin air conditioner error code J3

Causes:

This error is displayed on Daikin AC when/if:

  1. The discharge pipe thermistor of the OTD unit is malfunctioning.
  2. The wire harness and connectors of the thermistor are damaged or loose.
  3. The main PCB of the outdoor unit is malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code J4

Causes:

This error is displayed on Daikin AC when/if:

  1. The outdoor unit low-pressure equivalent saturated temperature sensor is malfunctioning.
  2. The wire harness of the sensor is damaged.
  3. The main PCB of the outdoor unit is defective.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code CC”.
  2. Insect the outdoor unit thermistor for any faults. Replace it if it’s defective.                        

Daikin air conditioner error codes J5, 8E, 8F, 92

Causes:

This error is displayed on Daikin AC when/if:

  1. The suction pipe thermistor of the system is not working. (8E and 8F/92 error codes are for system 1 and system 2 in HEATING mode respectively).
  2. The wire harness is broken or loose.
  3. The main PC of the outdoor unit is defective.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code J6, 84, 85

Causes:

This error is displayed on Daikin AC when/if:

  1. The thermistor of the heat exchanger (error code 84 for system no. 1, error code 85 for system no. 2) is malfunctioning.
  2. The wire harness of the thermistor is damaged.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code JA, 76

Causes:

This error is displayed on Daikin AC when/if:

  1. The high-pressure sensor of the outdoor unit is not working.
  2. The wire harness of the sensor is damaged.
  3. The main PCB of the outdoor unit is defective.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code CC”.

Daikin air conditioner error code JC, 75

Causes:

This error is displayed on Daikin AC when/if:

  1. The low-pressure sensor of the outdoor unit is malfunctioning.
  2. The wire harness of the sensor is damaged.
  3. The main PCB of the outdoor unit is defective.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code CC”.

Daikin air conditioner error code JE

Causes:

This error is displayed on Daikin AC when/if:

  1. The sub-tank thermistor of the outdoor unit is not functioning.
  2. The wire harness and connectors of the thermistor are damaged or loose.
  3. The outdoor unit’s main PCB is malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code JF

Causes:

This error is displayed on Daikin AC when/if:

  1. The heating thermistor equipped on the outdoor unit heat exchanger is malfunctioning.
  2. The wire harness and connectors of the thermistor are damaged or loose.
  3. The main PCB of the outdoor unit is malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code JH

Causes:

This error is displayed on Daikin AC when/if:

  1. The outdoor unit oil thermistor is not working properly.
  2. The wire harness and connectors of the thermistor are broken or loose.
  3. The OTD unit’s main PCB is malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.        

Daikin air conditioner error code L0

Causes:

This error is displayed on Daikin AC when/if:

  1. The inverter system is malfunctioning.

Solutions:

  1. Check the voltage supply and make sure it is consistent and in the required range.
  2. Check the main PCB of the inverter for any malfunction. Replace the PCB if it’s at fault.
  3. Check the power transistor for issues. Replace the transistor if it is defective.

Daikin air conditioner error code L1

Causes:

This error is displayed on Daikin AC when/if:

  1. The main PCB of the inverter system has stopped working.

Solutions:

  1. Turn OFF the system and then turn it ON again after a few seconds. Immediately shut OFF the system if the error is still there.
  2. Check the wiring and repair any un-insulated wires harnesses or loose connectors.
  3. Replace the fuse if they are blown away.
  4. Check the outdoor unit fan motor and ensure it is working. Repair the motor if faulty.
  5. Check the main PCB of the inverter and replace it if it’s defective.

Daikin air conditioner error code L3

Causes:

This error is displayed on Daikin AC when/if:

  1. The (fin) temperature in the electric box of the system is incorrect.
  2. There are open or short circuits in the electrical box.

Solutions:

  1. Open the electrical box and ensure there’s no short circuit. Repair the wiring and components if there was any.
  2. Repair uninsulated wires or loose connectors in the electrical box.
  3. Check the main power transistor of the electrical box and if it’s faulty, replace it.
  4. Check the outdoor unit fan and ensure it is working.
  5. Inspect the outdoor unit main PCB and replace it if defective.

Always seek assistance from an HVAC engineer or a local technician. This will prevent you and the system from any harmful results as working with wires and electrical components without proper safety and knowledge can lead to dangerous aftermaths.

Daikin air conditioner error code L4

Causes:

This error is displayed on Daikin AC when/if:

  1. The radiating fin temperature of the inverter is increasing abnormally.
  2. There was a short circuit in the fin thermistor or related components.

Solutions:

  1. Check and repair any damaged wires or loose connectors.
  2. Replace the main PCB if it is malfunctioning.
  3. If the fin thermistor is malfunctioning, try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.            

Daikin air conditioner error code L5

Causes:

This error is displayed on Daikin AC when/if:

  1. The system is indicating an inverter instantaneous DC overcurrent.

Solutions:

  1. Check the stop and EXP valve for clogging or damage. Clean, repair, or replace the valve as suggested by the technician.
  2. Check the main PCB and replace it if it’s defective.
  3. Inspect the compressor for malfunctioning. Repair or replace it as needed.                       

Daikin air conditioner error code L6

Causes:

This error is displayed on Daikin AC when/if:

  1. The system is indicating an inverter instantaneous AC overcurrent.

Solutions:

  1. Check the refrigerant amount and if it is overcharged, release some to bring it back to a normal level.
  2. Check the power supply capacity and make sure it is consistent and is supplied in the required amount.
  3. Inspect the compressor for any faults. Repair or replace the compressor as suggested by the technician.
  4. If the error is still there, seek professional help to inspect the inverter system and troubleshoot the issues.

Daikin air conditioner error code L8

Causes:

This error is displayed on Daikin AC when/if:

  1. Too much voltage is supplied to the inverter compressor.
  2. The system has initiated overcurrent protection of the inverter compressor.
  3. High pressure rises due to clogged refrigerant circuits.

Solutions:

  1. Check the power cord and ensure it is properly connected to the wall receptacle.
  2. Check the refrigerant circuits and make sure it is fully opened.
  3. Clean condenser coils and other components from clogging. Clean them as required.
  4. Check the power supply and replace it if defective.
  5. Check the inverter compressor for any issues. Repair or replace the component as needed.       

Daikin air conditioner error code L9

Causes:

This error is displayed on Daikin AC when/if:

  1. The inverter compressor is failing to start up.
  2. The inverter kick-start functionalities are malfunctioning.

Solutions:

  1. Turn OFF the system and then turn it ON again after a few seconds. Energize the compressor multiple times.
  2. Check the compressor wiring for any damages and connectors for looseness. Repair wiring and connectors where needed.
  3. Check the pressure equalization for any defects or faults. Seek professional help if needed.
  4. Check the main PCB as it may be failing to send instructions. Replace the PCB if it’s defective.
  5. If the error remains, inspect the inverter compressor. Repair or replace the component as preferable.

Daikin air conditioner error code LA

Causes:

This error is displayed on Daikin AC when/if:

  1. The power transistor of the inverter or AC unit is malfunctioning or faulty.

Solutions:

  1. Restart the aircon after keeping it OFF for a few seconds. Shut down the system if the error is still there.
  2. Check the power transistor for any issues. Replace the transistor if it is defective.
  3. Check the inverter PCB and replace it if it is malfunctioning.
  4. If the error persists, seek professional help to inspect the compressor. Repair or replace the compressor as needed.          

Daikin air conditioner error code LC

Causes:

This error is displayed on Daikin AC when/if:

  1. The main PCB of the outdoor unit and the microcomputer are unable to communicate.
  2. The transmission system between the control and inverter PCB of the system is malfunctioning.

Solutions:

  1. Turn OFF the AC unit and let it rest for a couple of minutes. Restart the unit and see if the error goes away.
  2. Check the wiring and connections between the micro-computer, control system, inverter, or the outdoor unit main PCB. Repair uninsulated wires and broken connectors.
  3. Check the grounding connections and ensure it is secure and in place.
  4. If the error persists, inspect the outdoor unit’s main PCB and replace it if it’s malfunctioning.

Daikin air conditioner error code M1

Causes:

This error is displayed on Daikin AC when/if:

  1. The centralized remote controller of the AC unit is not working.
  2. The remote controller is not sending or receiving signals.
  3. The remote controller PCB is malfunctioning.

Solutions:

  1. Check the remote settings and ensure everything is properly adjusted.
  2. Remove the obstacles coming between the remote controller and the AC unit signal receiver.
  3. Check the battery and install new batteries if the old ones are dead.
  4. Try another or buy a new remote controller if the original is broken, damaged, or stopped working.
  5. If the error remains, seek professional help to inspect and replace PCB if it’s faulty.

Daikin air conditioner error code M8

Causes:

This error is displayed on Daikin AC when/if:

  1. The optional controllers for the centralized control are unable to communicate.
  2. Transmission error between the centralized controls.

Solutions:

  1. Turn OFF the AC unit and then turn it ON again after a few seconds.
  2. Check and make sure that the power is connected to the centralized controls.
  3. Check the wiring between the controllers, power supply, and the main PCB. Repair pinched wires and loose connectors.
  4. Make sure that the centralized control reset switch is fine. Repair or replace the switch if broken.
  5. Ensure that the central remote controller isn’t changed. Seek professional help if needed.

Daikin air conditioner error code MA

Causes:

This error is displayed on Daikin AC when/if:

  1. The combination of the optional controller for centralized control is not correct.
  2. Multiple master controllers are connected to a single AC system.

Solutions:

  1. Take a look at the combination of optional controllers and ensure they are in the right scenario.
  2. Check the settings of the centralized control and ensure it is properly calibrated.
  3. Repair or replace the centralized control itself as it may be malfunctioning.

Daikin air conditioner error code MC, UC

Causes:

This error is displayed on Daikin AC when/if:

  1. Different addresses in the AC system are not correct.
  2. The same address is being used in multiple locations.
  3. Address settings are wrongly calibrated.
  4. The address of the central remote control is being duplicated.

Solutions:

  1. Check the settings of the remote controller and correct them if they are wrong. Reset the remote controller settings to default if you are unable to understand the settings.
  2. Adjust the address settings and ensure there are no duplications.
  3. Seek professional help to ensure the right addresses are being used on all controllers and components.

Daikin air conditioner error code P0

Causes:

This error is displayed on Daikin AC when/if:

  1. The refrigerant level (thermal storage unit) is low.
  2. The gas for the refrigerant piping of the AC unit has blockages.

Solutions:

  1. Check the refrigerant level and if it is less than required, fill the freon gas.
  2. Check the refrigerant piping for any clogging. Clean the piping and remove any foreign objects stuck in it.

Always seek professional help whenever needed because tweaking things without proper knowledge may lead to bigger issues.             

Daikin air conditioner error code P1

Causes:

This error is displayed on Daikin AC when/if:

  1. The outdoor unit power or voltages being supplied are not consistent.
  2. The open-phase voltages are imbalanced.

Solutions:

  1. Using a meter, check the power voltages between different phases. Seek professional help if they aren’t consistent.
  2. Inspect the wiring between different phases, power supply, main PCB, and related components. Repair uninsulated wires and loose connectors.
  3. Check the circuit capacitor of the outdoor unit and if it is defective, replace it.
  4. Check the power cord and power supply for malfunction. Repair or replace parts as needed.

Daikin air conditioner error code P2

Causes:

This error is displayed on Daikin AC when/if:

  1. The system sends an indication that the automatic refrigerant change operation of the outdoor unit has stopped abruptly.

Solutions:

  1. Check the top valve and clean it if something is causing a clog.
  2. Clean the valve of the refrigerant tank.
  3. Check the refrigerant level and fill the gas if it’s below the required level.

Daikin air conditioner error code P3

Causes:

This error is displayed on Daikin AC when/if:

  1. The electrical box thermistor is malfunctioning.
  2. The wire harness of the thermistor or main PCB is damaged.
  3. The main PCB is malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code P4

Causes:

This error is displayed on Daikin AC when/if:

  1. The radiating fin temperature sensor of the outdoor unit is not working.
  2. The wire harness of the sensor is damaged.
  3. The main PCB of the outdoor unit is defective.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code CC”.

Daikin air conditioner error code P8

Causes:

This error is displayed on Daikin AC when/if:

  1. The system starts the heat exchanger freezing protection while the automatic refrigerant charging operation is running.

Solutions:

  1. Wait for a few seconds because freezing protection can be deactivated when the icing is melted from the outdoor unit.
  2. If the error persists, close the refrigerant cylinder and gas-filling process.
  3. Wait for a few minutes and then start your process from the beginning.     

Daikin air conditioner error code P9

Causes:

This error is displayed on Daikin AC when/if:

  1. The automatic refrigerant charge operation on outdoor units has been completed.
  2. The fan motor of the outdoor unit humidifier is not working.

Solutions:

  1. If the error is because of cause 1, it’s not an issue of concern. Just restart the system.
  2. Check the wires harness of the fan motor and its connections with the power supply and main PCB. Repair harnesses and connectors where damaged.
  3. Check the main PCB of the outdoor unit and replace it if it is faulty.
  4. Seek professional help to inspect the fan motor. Repair or replace the motor if defective.

Daikin air conditioner error code PA

Causes:

This error is displayed on Daikin AC when/if:

  1. The wire of the heater in the humidifier unit is damaged, uninsulated, or broken.
  2. The heater unit is malfunctioning.
  3. Main PCB is defective.
  4. The refrigerant cylinder of the main unit is empty.

Solutions:

  1. Look through the heater wiring and repair any broken or damaged wiring.
  2. Inspect the heater for any faults. Repair or replace the part as needed.
  3. Check the outdoor unit thermistor and replace it if it’s defective.
  4. Replace the outdoor unit PCB if it’s malfunctioning.
  5. Check the refrigerant level in the master unit cylinder. Fill the gas if it’s empty.                  

Daikin air conditioner error code PC

Causes:

This error is displayed on Daikin AC when/if:

  1. The refrigerant cylinder is empty during the automatic refrigerant charging process.
  2. The refrigerant cylinder of slave unit no. 2 is empty.

Solutions:

  1. Fill either of the refrigerant cylinders if it is empty with the freon gas.
  2. If that’s not the case, seek professional help to inspect the transistor and main PCB of the outdoor unit if the error remains.

Daikin air conditioner error code PE

Causes:

This error is displayed on Daikin AC when/if:

  1. The system is detecting that the automatic refrigerant charge process is almost completed.

Solutions:

  1. Let the operation complete and things will get back to normal working after that.
  2. Restart the AC unit after turning it OFF for 15-30 seconds.
  3. Seek professional help if the error remains.              

Daikin air conditioner error code PH

Causes:

This error is displayed on Daikin AC when/if:

  1. The humidifier unit’s temperature system is malfunctioning.
  2. The refrigerant cylinder of slave unit no 1 is empty during the automatic refrigerator chainring processes.

Solutions:

  1. Check the wiring of the heater and temperature system. Repair broken wiring and loose connectors where needed.
  2. Check the heater itself for any faults. Repair or replace the component.
  3. The main PCB of the outdoor unit needs replacement.
  4. Check the thermistor and replace the spare part if it is malfunctioning.
  5. Check the refrigerant level and if it is low, fill it.                    

Daikin air conditioner error code PJ

Causes:

This error is displayed on Daikin AC when/if:

  1. The capacity settings or capacitor of the outdoor unit main PCB is malfunctioning.
  2. The connection or combination between the inverter and the fan driver is wrong.

Solutions:

  1. Check and ensure that the capacity setting adapter is installed in the OTD unit.
  2. Seek professional help to ensure that the capacity adapter is working fine. Replace the adapter if it is faulty.
  3. Replace the OTD unit PCB if it’s malfunctioning.
  4. Check the wiring and connection between the inverter and fan driver. Repair if wires are damaged.
  5. Check the inverter PCB and control PCB. Replace either of the PCBs if faulty.    

Daikin air conditioner error code U0

Causes:

This error is displayed on Daikin AC when/if:

  1. The refrigerant level is low in the AC system.
  2. Low supply of refrigerant in the system.

Solutions:

  1. Check the refrigerant level and fill the freon gas if it’s low.
  2. Clean the stop valve if it is clogged due to dirt or something stuck.
  3. Clean the refrigerant piping for any clogging.

Daikin air conditioner error code U1

Causes:

This error is displayed on Daikin AC when/if:

  1. The reverse phase and open phase combination are wrong.
  2. The reverse phase open phase power wiring is damaged.

Solutions:

  1. Repair the damaged, broken, or un-insulated power wiring of the open and reverse phases.
  2. Replace the main PCB of the outdoor unit if it is malfunctioning.

Daikin air conditioner error code U2

Causes:

This error is displayed on Daikin AC when/if:

  1. The power supply voltages are not consistent.
  2. The system is facing an instantaneous power failure.
  3. The power supply is malfunctioning.

Solutions:

Contact a local technician or an electrician to:

  1. Using a meter, check the power supply voltages and make sure they are consistent. Repair power cord and related spare parts if voltages are fluctuating.
  2. Repair any damaged or uninsulated wiring of the power supply.
  3. Repair or replace the power supply of the outdoor unit if it is defective.
  4. Inspect the main PCB and replace it if it is faulty.

Daikin air conditioner error code U3

Causes:

This error is displayed on Daikin AC when/if:

  1. The transmission or communication path or system is defective.

Solutions:

  1. Repair the transmission wiring if they are broken, damaged, or faulty.
  2. Replace the outdoor unit main PCB if it is malfunctioning.

Daikin air conditioner error code U4

Causes:

This error is displayed on Daikin AC when/if:

  1. The transmission path between the indoor and outdoor units of the AC system is interrupted.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code LC” per indoor and outdoor units.
  2. Inspect the main PCBs of both indoor and outdoor units. Replace either of the PCBs if they are faulty.

Daikin air conditioner error code U5

Causes:

This error is displayed on Daikin AC when/if:

  1. The communication system or transmission path between the indoor unit and the remote controller is failed.

Solutions:

  1. Check the wiring and connections of the transmission wire between the indoor unit and the remote controller. Repair any broken wires or loose connectors.
  2. Ensure that the remote main and sub-settings are properly adjusted. Reset settings to default if needed.
  3. Check the main PCB of the indoor unit and if it is malfunctioning, replace it.

Daikin air conditioner error code U6

Causes:

This error is displayed on Daikin AC when/if:

  1. The transmission between the indoor units of the AC system is faulty.

Solutions:

  1. Restart the AC unit to see if the error resolves.
  2. Replace any broken wires or loose connectors.
  3. Replace the PCB of the indoor unit if it is defective.             

Daikin air conditioner error code U7

Causes:

This error is displayed on Daikin AC when/if:

  1. The transmission path or system between the main body microcomputer and the INV microcomputer is malfunctioning.
  2. The outdoor units of the AC system are unable to communicate properly or completely fail.

Solutions:

  1. Repair broken wiring or disconnected connectors between the components.
  2. Check the main PCB of the outdoor unit and replace it if it’s malfunctioning.
  3. Inspect the microcomputers and if they are at fault, seek professional help for troubleshooting and repairing.

Daikin air conditioner error code U8

Causes:

This error is displayed on Daikin AC when/if:

  1. The transmission between the remote controllers is stopped.

Solutions:

  1. Repair any damaged wire harnesses.
  2. Inspect the main PCBs and replace them if they are faulty.
  3. Check the controllers and if they are defective, replace them with new ones.

Daikin air conditioner error code U9

Causes:

This error is displayed on Daikin AC when/if:

  1. The AC system is unable to communicate with the indoor or outdoor unit of another AC system.

Solutions:

  1. Check the communications path and fix any damaged harnesses.
  2. Check the electronic expansion valve of the other system’s indoor unit. Repair or replace the valve if it fails.
  3. Inspect PCBs of all units of every system and replace the one’s malfunctioning.

Daikin air conditioner error code UA

Causes:

This error is displayed on Daikin AC when/if:

  1. The power supply of the indoor or outdoor unit is malfunctioning.
  2. Incorrect or fluctuating voltages are being supplied to the system.
  3. The indoor and outdoor units are of different models or versions.
  4. Main PCB is malfunctioning.
  5. The field settings are wrong by the remote controller.
  6. The remote controller temperature settings wiring is damaged.
  7. Service mode is running on the system.

Solutions:

  1. Inspect the power and power supply for any damages or malfunctions. Repair or replace the spare parts as preferable.
  2. Check voltages and ensure consistent supply.
  3. Look at the unit labels and if the indoor and outdoor units are different, contact the company sales department to replace the wrong model with the correct one.
  4. Set or completely reset the field settings by the remote controller.
  5. Repair any broken wire harnesses or loose connectors if damaged.
  6. Cancel the service mode on the aircon system if it is still running.
  7. Replace the PCB of either unit if it is malfunctioning.

Always seek professional help because this error can occur due to many causes and solutions will also be applied per the issue.

Contact an HVAC professional who is not just an electrician but has knowledge about different settings and how to adjust them.

Daikin air conditioner error code UE

Causes:

This error is displayed on Daikin AC when/if:

  1. The transmission between the indoor and centralized controller is interrupted or completely failed.
  2. The transmission path or wiring is damaged.
  3. The indoor unit’s main PCB is malfunctioning.

Solutions:

  1. Restart the aircon system after keeping it OFF for 5-15 seconds.
  2. Check the transmission wire between the two components and if it is defective, repair the wire as needed.
  3. Check and ensure that the accurate setting of the centralized controller number is there. Make alterations if needed.
  4. Seek professional help to inspect the main PCB of the indoor unit and replace the component if it is malfunctioning.

Daikin air conditioner error code UF

Causes:

This error is displayed on Daikin AC when/if:

  1. The wiring or pipelines are not properly connected or are mismatched.
  2. A wire between the indoor and outdoor unit is broken or a pipe is bent or leaked.

Solutions:

  1. Look through the wiring between the indoor and outdoor units. Repair any damaged wire and make sure that each wire is connected to its intended location. Fix any loose connectors.
  2. Take a look at the piping between the unit and fix if they are not properly installed or connected. 

Daikin air conditioner error code UH

Causes:

This error is displayed on Daikin AC when/if:

  1. Transmission wiring between indoor and outdoor units or two outdoor units is failed.
  2. The indoor or outdoor units’ main PCBs are defective.
  3. The indoor and outdoor units are not matching.
  4. The inconsistent voltage supply to the system.
  5. The system has activated freeze protection in the indoor unit.

Solutions:

  1. Repair any broken wire or loose connectors for transmission between the indoor and outdoor units or outdoor and outdoor in different aircon systems.
  2. Inspect the main PCBs of either unit and if it is malfunctioning, replace it.
  3. Take a look at the label on both units and if they are different or not matching, contact the company sales department to deliver the right model.
  4. Check voltages and fix the power supply or power cord if it’s defective.
  5. Run the fan at full speed or turn OFF the system until icing melts down from the coils. The error will be down as soon as the protection process completes.

Daikin air conditioner error code UJ

Causes:

This error is displayed on Daikin AC when/if:

  1. The accessory devices are unable to communicate or the transmission between them is cut or interrupted.
  2. The transmission wire is damaged.
  3. The main PCB is malfunctioning.

Solutions:

  1. Switch OFF the system and turn it ON after 5-15 seconds.
  2. Repair the transmission wire between devices if it is uninsulated, damaged, or broken.
  3. Inspect the accessory devices for any faults. Repair or replace the devices if needed.

Daikin air conditioner error code 64

Causes:

This error is displayed on Daikin AC when/if:

  1. The air thermistor of the indoor unit is malfunctioning.
  2. The wire harness and connectors of the thermistor are damaged or loose.
  3. The main PCB of the indoor unit is malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code 77, 78

Causes:

This error is displayed on Daikin AC when/if:

  1. The fan interlock (77 for system 1, 78 for system 2) is broken.
  2. The fan interlock is not functioning properly.
  3. The relay contact is defective.

Solutions:

  1. Check the wiring harnesses of the fan interlocks. Repair if the wire is broken or loose.
  2. Check the relay contact of the interlock. Fix or replace the relay if defective.

Daikin air conditioner error code 7C

Causes:

This error is displayed on Daikin AC when/if:

  1. The pump interlock is malfunctioning.
  2. The cooling water pump interlock protection mode has been activated.

Solutions:

  1. Check the water pump interlock for any clogging or breakages. Repair the damages or remove stuck objects from the pump.
  2. Check the wire harnesses of the pump and ensure it is insulated.
  3. Check the pump for any defects. Repair or replace it as needed.

Seek professional help to inspect the pump and suggest the best solution depending on the condition of the pump in your specific Daikin aircon system.

Daikin air conditioner error code 81, 8A

Causes:

This error is displayed on Daikin AC when/if:

  1. The leaving water temperature thermistor is not working (error code 8A for system no 2).
  2. The wire harness of the thermistor or main PCB is damaged.
  3. The main PCB is malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code 82, 83

Causes:

This error is displayed on Daikin AC when/if:

  1. The refrigerant thermistor is malfunctioning (82 and 83 error codes are for system no. 1 and system no. 2, respectively).
  2. The wire harness of the thermistor or main PCB is damaged.
  3. The main PCB is malfunctioning.

Solutions:

  1. Try the exact solutions suggested for the Daikin air conditioner “Error Code EC, 80”.

Daikin air conditioner error code 89

Causes:

This error is displayed on Daikin AC when/if:

  1. The brazed plate of the system is not working or is defective.
  2. The heat exchanger of either unit is freezing or malfunctioning.

Solutions:

  1. Seek professional help to check the brazed plate and repair or replace it as needed.
  2. Clean the heat exchanger as it may be clogged because of dirt build-up or some foreign items stuck in it.
  3. Check the refrigerant level and fill the freon gas if it is less than required.
  4. Inspect the thermistor for any faults. Repair or replace the component as needed.

Daikin air conditioner error code 8H

Causes:

This error is displayed on Daikin AC when/if:

  1. The temperature of the hot water is too high or exceeds the normal limit.
  2. The 3-way valve of the system is not functioning or completely failed.
  3. The water temperature setting is incorrect.
  4. The thermistor is defective. 

Solutions:

  1. Take a look at the hot water temperature setting and calibrate each setting at the best suitable value.
  2. Inspect the 3-way valve and see if it is broken, closed, or damaged, repair or replace the valve as preferable.
  3. Inspect the thermistor and replace the spare part if it is malfunctioning.
  4. Check and replace the outdoor unit main PCB if it is malfunctioning.

Daikin air conditioner error code 90

Causes:

This error is displayed on Daikin AC when/if:

  1. The cool or chilled water quantity is not as required in the AC system.
  2. The AXP of the system is abnormal or not functioning at all.
  3. Main PCB has some issues or defects.

Solutions:

  1. Turn OFF the AC system and check the water level in the aircon. Ensure it is just as required.
  2. Check the wiring and connectors of the AXP and make sure it is properly connected to its intended position. Repair any broken wire or loose connectors.
  3. Inspect the main PCB and replace it if it is malfunctioning.

Daikin air conditioner error code 94

Causes:

This error is displayed on Daikin AC when/if:

  1. The transmission between the fan unit and the heat reclaim ventilation unit is interrupted.
  2. The wire harness is damaged.
  3. Fan PCB is malfunctioning.

Solutions:

  1. Restart the system to see if the error goes away.
  2. The wiring between the two components is broken. Repair the wires and fix loose connections.
  3. Inspect the main PCB of the fan unit and replace it if defective.

Daikin air conditioner error code 95, 96

Causes:

This error is displayed on Daikin AC when/if:

  1. The inverter system (error code 95 for system no 1, error code 96 for system no 2) has stopped working.
  2. The fan inverter unit has stopped working.
  3. Aircon fuses are blown away due to voltage fluctuations.
  4. Circuit breakers are tripped.

Solutions:

  1. Ensure a consistent and in-the-range supply of voltages to the inverter system.
  2. Check wiring and connections. Do the repairing work where needed.
  3. Check the fuses and ensure they aren’t blown away. Replace the fuse if burned.
  4. Check the breakers and reset them if they are tripped.
  5. Check the capacitors of the unit and replace them if they are broken or worn out.
  6. If the error remains, seek assistance from a technician or an electrician to troubleshoot and fix the system.

Daikin air conditioner error code 98

Causes:

This error is displayed on Daikin AC when/if:

  1. The thermal storage brine pump of the system is not working (partially or completely).
  2. The system has detected activation of the thermal storage brine pump overcurrent protection.

Solutions:

  1. Check the voltages supplied to the thermal storage brine pump and ensure they are consistent and in the required range.
  2. Check wiring, connections, and power cord. Repair the damages or looseness where needed.
  3. Inspect the thermal storage brine pump for any issues. Repair or replace the component as preferable.
  4. If the error remains, inspect the main PCB of either unit and replace it if it’s defective.

Daikin air conditioner error code 99

Causes:

This error is displayed on Daikin AC when/if:

  1. The thermal storage brine tank is malfunctioning.
  2. The water level is low.
  3. The valves of the tank are clogged due to dirt build-up.

Solutions:

  1. Check the water level in the thermal storage brine and fill it if it’s low.
  2. Check valves and ensure they are fine. Repair, clean, or replace the valve if needed.

Seek professional help if you don’t have the proper knowledge or you are unable to understand the condition in all aspects.

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