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Daikin Error Codes

  1. Error Code: A0 Description: External protection device activated
  2. Error Code: A1 Description: Indoor unit PCB assembly error
  3. Error Code: A3 Description: Drain level error (drain pump malfunction or blockage)
  4. Error Code: A5 Description: Antifreeze or overheat protection
  5. Error Code: A6 Description: Indoor fan motor malfunction
  6. Error Code: A7 Description: Swing flap motor malfunction
  7. Error Code: A9 Description: Electronic expansion valve malfunction
  8. Error Code: AA Description: Indoor/outdoor communication error
  9. Error Code: C4 Description: Outdoor unit heat exchanger temperature sensor error
  10. Error Code: C5 Description: Outdoor unit malfunction (communication error, power supply error)
  11. Error Code: C7 Description: Outdoor unit fan motor malfunction
  12. Error Code: C9 Description: Compressor malfunction (lock, overload)
  13. Error Code: E3 Description: High pressure protection
  14. Error Code: E4 Description: Low pressure protection
  15. Error Code: E5 Description: Overcurrent protection
  16. Error Code: E6 Description: Compressor startup error
  17. Error Code: E7 Description: Outdoor unit coil temperature sensor error
  18. Error Code: E8 Description: Overload protection
  19. Error Code: E9 Description: Indoor/outdoor communication error (wiring error, indoor or outdoor PCB error)
  20. Error Code: F3 Description: Discharge pipe temperature sensor error