U0
Meaning
System is running with insufficient refrigerant.
Causes
- Gas leak
Solution
- Refill refrigerant
- Fix leakage
DaikinSplit Air Conditioner
General Series
Common Daikin split AC error codes with causes and solutions.
- Refer to model-specific manual for exact mapping
U4
Meaning
Indoor and outdoor units communication failure.
Causes
- Loose wiring
Solution
- Reconnect wires