Daikin Air Conditioner Error Codes

1

A0

An external protection device connected to the indoor unit has been activated

$80–$250 hard

2

A1

A fault was detected in the indoor unit PCB (control board)

$150–$400 hard

3

A3

The drain level control system has detected an abnormality — drain may be clogged

$0–$200 medium

4

A4

Freezing protection activated — low water temperature or insufficient water volume

$80–$250 hard

5

A5

Freeze-up protection (cooling) or high pressure control (heating) has activated — check the air filter

$0–$150 easy

6

A6

The indoor unit fan motor has a fault

$150–$400 hard

7

A7

The swing flap motor (airflow direction louvre) has a fault

$80–$250 hard

8

A8

A power supply fault or AC input overcurrent was detected at the indoor unit

$80–$300 hard

9

A9

The indoor unit electronic expansion valve has a fault

$150–$400 hard

10

AA

The indoor unit heater overheated — safety device activated

$80–$250 hard

11

AF

The optional humidifier unit system has a fault

$80–$250 hard

12

AH

The Streamer dust collector or air cleaner has a fault

$0–$200 easy

13

AJ

A capacity setting fault was detected in the indoor unit PCB

$80–$250 hard

14

C1

A communication fault was detected between the indoor unit PCB and sub PCB

$80–$300 hard

15

C4

The indoor unit liquid pipe thermistor has a fault

$80–$250 hard

16

C5

The indoor unit gas pipe thermistor has a fault

$80–$250 hard

17

C6

The fan motor sensor or fan control driver has a fault

$100–$350 hard

18

C7

The front panel driving motor has a fault

$80–$200 hard

19

C9

The indoor unit suction air thermistor has a fault

$80–$250 hard

20

CA

The indoor unit discharge air thermistor has a fault

$80–$250 hard

Daikin Air Conditioner error codes

Error Codes