Daikin Air Conditioner Error A4

⚡ Quick Answer: The Daikin air conditioner A4 error code indicates a communication failure between the indoor and outdoor units, often due to abnormal temperature rea... ✅ DIY Fixable

What Does Error A4 Mean?

The Daikin air conditioner A4 error code indicates a communication failure between the indoor and outdoor units, often due to abnormal temperature readings from the heat exchanger. This error can cause the unit to stop operating and display the A4 code on the remote or LEDs. It may also signify issues with the temperature sensor or heat exchanger itself.

Common Symptoms:

  • Unit stops operation and displays A4 on remote or LEDs
  • Possible abnormal temperature readings related to heat exchanger

Possible Causes

  • Abnormal temperature detected on primary heat exchanger (sensor reading outside expected range) (medium)

How to Fix Error A4

DIY Fix Basic checks for heat exchanger temperature abnormality

  1. Turn off the air conditioner and wait a few minutes before restarting to see if the error reoccurs.
  2. Ensure air filters are clean and airflow around the indoor and outdoor units is unobstructed.
  3. Check for ice buildup on the indoor or outdoor heat exchanger if in cooling mode.

Technician Only Inspect heat exchanger and temperature sensing components

  1. Use service tools to read detailed fault history and sensor readings.
  2. Test temperature sensors around the heat exchanger for continuity and correct values.
  3. Inspect heat exchanger coils for blockages, refrigerant flow issues, or physical damage.

Parts needed: Heat exchanger temperature sensor, Heat exchanger coil

🛑 When to Call a Pro:
  • If error reappears after basic restart
  • If other symptoms like vibration, noise, or no cooling/heating occur
  • If ice buildup or abnormal heat exchanger temperature persists

Technical Specifications

wattage 2000W
component Control Board
resistance 5-15 ohms
part_number DAIKIN 4E-1B
voltage_rating 230V AC

Common Questions

What does A4 error mean on daikin air conditioner?

The A4 error indicates a communication failure between the indoor and outdoor units due to abnormal heat exchanger temperatures.

Can I fix daikin air conditioner A4 error myself?

Yes, you can perform basic checks like restarting the unit, cleaning air filters, and checking for ice buildup.

How much does it cost to fix A4 error?

Repair costs for the A4 error can range from ¥5,000 to ¥30,000 depending on the parts and model.

When should I call a technician for A4?

Call a technician if the error reappears after a restart, or if you notice vibrations, noise, or persistent ice buildup.

Sources & References

Data last verified: 2026-07-01

User Comments (0)

Share your experience or solution below.

Be the first to comment!