ErrorCodeDoctor
Daikin Air Conditioner AF error code
The AF error means your Daikin air conditioner detected a fault with the optional humidifier unit accessory. This can be caused by the humidifier unit leaking, defective drain piping with an upward slope, or a defective indoor unit PCB. Contact a qualified technician to inspect the humidifier and drain piping.
Common causes
- Humidifier unit (optional accessory) is leaking
- Drain piping has an upward slope or is defective
- Defective indoor unit PCB
How to fix it
-
1
Contact a qualified technician to inspect the humidifier unit and drain piping
Related Daikin Air Conditioner error codes
A0
An external protection device connected to the indoor unit has been activated
A1
A fault was detected in the indoor unit PCB (control board)
A3
The drain level control system has detected an abnormality — drain may be clogged
A5
Freeze-up protection (cooling) or high pressure control (heating) has activated — check the air filter
AF error — frequently asked questions
What does the AF error mean on a Daikin air conditioner?
The optional humidifier unit system has a fault
What causes the AF error?
The AF error is usually caused by: Humidifier unit (optional accessory) is leaking; Drain piping has an upward slope or is defective; Defective indoor unit PCB.
Can I fix the AF error myself?
This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.
How much does it cost to fix the AF error?
Fixing the AF error on a Daikin air conditioner typically costs $80–$250, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the AF error?
We'd recommend addressing the AF error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.