Daikin Air Conditioner Error AA

⚡ Quick Answer: The Daikin air conditioner AA error indicates a communication failure between the indoor and outdoor units, often triggered by an overheating indoor h... ✅ DIY Fixable

What Does Error AA Mean?

The Daikin air conditioner AA error indicates a communication failure between the indoor and outdoor units, often triggered by an overheating indoor heater. This safety protection activates when excessive temperatures are detected, leading to the unit stopping operation and displaying the AA error on the remote or panel. Commonly occurs during or after using the heating mode, particularly if an electric heater function is present.

Common Symptoms:

  • Unit stops operation and displays AA on remote or panel
  • Occurs during or after heating mode (if equipped with electric heater function)
  • Indoor unit detects excessive temperature and trips a thermal safeguard

Possible Causes

  • Indoor heater (or heat exchanger) overheat/safety protection activation (medium)

How to Fix Error AA

DIY Fix Power cycle and basic checks

  1. Turn the air conditioner off using the remote control or main switch.
  2. Wait 10–15 minutes to allow internal temperatures to fall.
  3. Ensure there is no blockage around the indoor unit’s airflow (e.g., curtains, furniture).
  4. Restart the unit and observe whether AA returns.

Technician Only Inspect indoor unit heater and thermal sensors

  1. Check the indoor unit’s heater elements (if present) and thermal cutoff devices for faults.
  2. Measure temperatures and sensor outputs to confirm proper operation.
  3. Verify control board diagnostics for overheat triggers and inspect wiring integrity.
  4. Replace defective temperature sensors, heater elements, or related safety devices as needed.

Parts needed: Temperature sensors, Indoor heater elements (if applicable), Indoor unit control board, Thermal cutoff/overheat protection device

🛑 When to Call a Pro:
  • If the AA error reappears after basic power cycling and airflow checks
  • If the unit shows signs of overheating (hot to touch, unusual odors)
  • If uncertain about electrical/heater components inside the unit

Technical Specifications

wattage 1500W
component Control Board
resistance 5-15 ohms
part_number DAIKIN PCB-123456
voltage_rating 230V AC

Common Questions

What does AA error mean on daikin air conditioner?

AA error signifies a communication failure and heater overheating, causing the unit to stop and display the error.

Can I fix daikin air conditioner AA error myself?

Yes, you can try power cycling the unit and ensuring no airflow blockages.

How much does it cost to fix AA error?

Repair costs for the AA error range from ¥10,000 to ¥50,000+, depending on parts and labor.

When should I call a technician for AA?

Call a technician if the AA error persists after basic troubleshooting or if you notice signs of overheating.

Sources & References

Data last verified: 2026-07-01

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