Daikin is a global leader in air conditioning technology, known for its high-quality and energy-efficient split ACs. However, like any smart appliance, Daikin ACs are equipped with a self-diagnosis feature that displays error codes when something goes wrong.

In this blog, we’ll explore the most common Daikin split AC error codes, what they mean, and how to fix them — either by yourself or with professional help.

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❓ What Are Daikin Error Codes?

Error codes in Daikin ACs are alphanumeric signals that appear on the remote controller or indoor unit display. These codes help identify problems such as sensor failures, communication breakdowns, or component malfunctions.

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📋 Daikin Split AC Error Code List with Descriptions & Solutions

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1. Error Code: U0 – Low Refrigerant Level

• Description: The unit has detected insufficient refrigerant (gas).
• Solution:
  • Turn off the AC and contact a technician.
  • Get the refrigerant level checked and recharged if required.

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2. Error Code: U4 – Communication Error Between Indoor and Outdoor Units

• Description: The indoor and outdoor units are unable to exchange data.
• Solution:
  • Power off and restart the unit after 5–10 minutes.
  • Check for loose or broken wiring.
  • If issue persists, PCB or wiring replacement may be needed.

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3. Error Code: A1 – Indoor PCB Malfunction

• Description: The control board inside the indoor unit is faulty.
• Solution:
  • Switch off the unit completely and turn it back on.
  • If the error reappears, the indoor PCB may need to be repaired or replaced.

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4. Error Code: A5 – Freeze Protection or Overheating Detected

• Description: The system detected that the indoor heat exchanger is too cold or too hot.
• Solution:
  • Clean indoor filters and check airflow.
  • If issue persists, a sensor or fan motor check is required.

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5. Error Code: J3 – Discharge Pipe Sensor Error

• Description: Fault in the temperature sensor located in the outdoor discharge pipe.
• Solution:
  • Sensor inspection or replacement by a technician.
  • Restart the AC after minor checks.

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6. Error Code: C4 – Indoor Heat Exchanger Sensor Fault

• Description: The sensor monitoring the indoor coil temperature is malfunctioning.
• Solution:
  • Sensor may be dirty or damaged.
  • Replace the sensor if needed.

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7. Error Code: L5 – Compressor Lock or Overload

• Description: The compressor is either locked or overloaded due to high pressure or voltage.
• Solution:
  • Ensure proper airflow around the outdoor unit.
  • Shut down the unit and restart after 30 minutes.
  • Call for service if the problem persists.

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8. Error Code: E3 – High-Pressure Protection in Outdoor Unit

• Description: Indicates abnormal rise in refrigerant pressure.
• Solution:
  • Clean outdoor coil and check for airflow restrictions.
  • Technician inspection needed to check refrigerant cycle and fan motor.

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9. Error Code: E6 – Outdoor Unit Fan Motor Malfunction

• Description: The fan motor is not spinning or has failed.
• Solution:
  • Clean the fan and inspect motor wiring.
  • Replace motor if non-functional.

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10. Error Code: F3 – Outdoor Discharge Pipe Temperature Too High

• Description: The discharge pipe of the outdoor unit is overheating.
• Solution:
  • Ensure proper ventilation around the unit.
  • Let the unit cool and restart.
  • Technician check recommended for system pressure and gas levels.

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✅ General Maintenance Tips to Prevent Errors

• Clean filters every 15–20 days.
• Keep outdoor unit dust-free and well-ventilated.
• Install a voltage stabilizer to prevent damage from fluctuations.
• Get professional servicing at least once a year.
• Ensure drain pipe is not clogged to prevent water leakage and freeze protection errors.

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📞 When to Call a Technician?

You should seek professional help if:

• The same error code keeps returning after a restart.
• The unit doesn’t respond to commands.
• You notice unusual noise or poor cooling performance.

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🔚 Final Thoughts

Understanding these Daikin split AC error codes helps you identify issues early and avoid costly breakdowns. While some minor issues can be resolved with basic cleaning or resets, others demand technical expertise. Use this guide to stay cool and confident — even when your AC throws an error.

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Need help with Daikin AC repair or servicing? Contact your nearest authorized service center or call Daikin customer support for expert assistance.

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