ErrorCodeDoctor
Daikin Air Conditioner U0 error code
The U0 error means your Daikin air conditioner detected a shortage of refrigerant in the system. This is caused by a refrigerant leak or incorrect piping. Refrigerant handling requires certification — contact a qualified technician to locate the leak, repair it, and recharge the system.
Common causes
- Refrigerant has leaked from the system
- Refrigerant piping is incorrectly installed
- Defective thermistor giving a false low reading
- Defective low pressure sensor
How to fix it
-
1
Contact a qualified technician to inspect for refrigerant leaks, repair any found, and recharge the system to the correct level
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
U0 error — frequently asked questions
What does the U0 error mean on a Daikin air conditioner?
A refrigerant shortage was detected
What causes the U0 error?
The U0 error is usually caused by: Refrigerant has leaked from the system; Refrigerant piping is incorrectly installed; Defective thermistor giving a false low reading; Defective low pressure sensor.
Can I fix the U0 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 U0 error?
Fixing the U0 error on a Daikin air conditioner typically costs $200–$600, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the U0 error?
We'd recommend addressing the U0 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.