Daikin AC Error Codes List

Daikin AC Error Codes List, Meaning, Causes, Step-by-Step Solution & Difficulty Level

This complete guide explains the Daikin AC error codes list, meaning, causes, step-by-step solutions, and difficulty level so you can understand:

• What the code means

• Why it happens

• Whether you can fix it yourself

• When to call a technician

Daikin is one of the most reliable AC brands in India, but like all electronic systems, error codes help diagnose issues quickly.

Let’s decode everything clearly.

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How to Check Daikin AC Error Code

Before jumping into solutions, you must confirm the error code properly.

Method 1: Using Remote Control

1. Turn on the AC.

2. Press and hold the Cancel button for 5 seconds.

3. The remote will show error codes sequentially.

4. When you hear a long beep, that is your actual error code.

Method 2: Indoor Unit Display

Some models show the error directly on the indoor display panel.

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Common Daikin AC Error Codes – Complete List

Below is the most common Daikin split and inverter AC error codes list used in India.

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A1 – Indoor PCB Fault

Meaning:

Indoor unit PCB malfunction.

Causes:

• Voltage fluctuation

• Moisture damage

• Burnt PCB component

Step-by-Step Solution:

1. Turn off AC from main power supply.

2. Wait 5–10 minutes.

3. Restart the unit.

4. If error continues, PCB inspection required.

Difficulty Level:

 High – Technician required.

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 A5 – High Pressure Protection

Meaning:

Evaporator coil temperature too high.

Causes:

• Dirty filters

• Blocked airflow

• Low gas

• Indoor fan issue

Solution:

1. Clean AC filters.

2. Check indoor airflow.

3. Ensure vents are not blocked.

4. If unresolved, call technician for gas pressure check.

Difficulty Level:

 Medium – Basic cleaning possible.

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 U4 – Communication Error (Indoor & Outdoor)

Meaning:

Indoor and outdoor unit not communicating.

Causes:

• Loose wiring

• PCB issue

• Power fluctuation

Solution:

1. Turn off main supply.

2. Restart system.

3. Check wiring connections.

4. Technician may need to inspect communication cable.

Difficulty Level:

 High – Professional inspection needed.

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 L5 – Inverter Compressor Fault

Meaning:

Compressor overload or inverter module problem.

Causes:

• Overheating

• Faulty IPM module

• Voltage issues

Solution:

1. Turn off AC immediately.

2. Do not restart repeatedly.

3. Contact authorized service center.

Difficulty Level:

 Very High – Do not attempt self-repair.

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 E6 – Outdoor Fan Motor Error

Meaning:

Outdoor fan motor malfunction.

Causes:

• Fan motor failure

• Obstruction in fan

• Wiring issue

Solution:

1. Check if outdoor unit is blocked.

2. Clear debris.

3. If motor not running, technician required.

Difficulty Level:

 Medium to High.

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U0 – Refrigerant Shortage

Meaning:

Low refrigerant gas.

Causes:

• Gas leakage

• Improper installation

• Pipe joint issue

Step-by-Step Solution:

1. Turn off AC.

2. Check for oil marks on copper pipes.

3. Technician should perform leak test.

4. Repair leakage and refill gas.

Difficulty Level:

 High – Requires professional tools.

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C4 – Temperature Sensor Error

Meaning:

Liquid pipe temperature sensor malfunction.

Causes:

• Faulty thermistor

• Loose connection

Solution:

1. Restart AC.

2. If error persists, sensor replacement required.

Difficulty Level:

 Medium.

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 F3 – High Discharge Pipe Temperature

Meaning:

Compressor overheating.

Causes:

• Dirty condenser coil

• Gas imbalance

• Fan problem

Solution:

1. Clean outdoor unit coil.

2. Ensure proper ventilation around condenser.

3. Technician should check refrigerant pressure.

Difficulty Level:

Medium.

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 J3 – Discharge Pipe Temperature Sensor Fault

Meaning:

Outdoor thermistor failure.

Causes:

• Sensor damage

• PCB reading error

Solution:

Sensor testing and replacement by technician.

Difficulty Level:

 High.

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Quick Reference Table – Daikin Error Codes

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When Should You Call a Technician?

Call professional service when:

• Error persists after restart

• Compressor-related codes appear

• Gas leakage suspected

• PCB fault displayed

Authorized Daikin service ensures genuine spare parts.

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Why Do Daikin AC Error Codes Appear?

Common reasons:

1. Poor maintenance

2. Voltage fluctuation

3. Gas leakage

4. Dust accumulation

5. Aging components

Regular servicing reduces error frequency.

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Preventive Maintenance Tips

•  Clean filters every 30 days
•  Service AC before summer
•  Install voltage stabilizer
• Keep outdoor unit clean
•  Check drain pipe blockage

Prevention is always cheaper than repair.

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Difference Between Minor & Major Error Codes

Minor Codes

• A5

• F3

• C4

Mostly related to airflow or sensor issues.

Major Codes

• L5

• A1

• U4

Related to compressor or PCB.

Never ignore major error codes.

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Are Daikin Error Codes Model-Specific?

Yes.

Error codes may vary slightly between:

• Split AC

• Inverter AC

• VRV systems

Always refer to model manual for confirmation.

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Cost of Repair Based on Error Type

Cost varies by model and capacity.

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Frequently Asked Questions (FAQ)

How do I reset Daikin AC error code?

Turn off main power for 5–10 minutes and restart.

What is U4 error in Daikin AC?

Communication failure between indoor & outdoor unit.

What is L5 error in Daikin AC?

Compressor overload or inverter module fault.

Can I fix A5 error myself?

Yes, try cleaning filters first.

Is gas refill covered under warranty?

Usually not, unless manufacturing defect.

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Final Summary

Understanding Daikin AC error codes helps you:

•  Diagnose problems faster
•  Avoid unnecessary service charges
•  Prevent major breakdowns
•  Maintain efficient cooling

Key Advice:

• Minor airflow issues → Clean filters

• Sensor issues → Technician check

• Compressor/PCB codes → Call professional immediately

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Conclusion

Daikin AC error codes are built-in diagnostic tools that help identify problems quickly.

Whether it’s U4 communication error, A5 high pressure, or L5 compressor fault, understanding the meaning and causes allows you to take the right action.

Regular maintenance and professional servicing ensure your Daikin AC runs efficiently for years.

If error persists, always contact authorized Daikin service center for safe and reliable repair.

Stay informed. Stay cool.