Mini-split
Daikin mini-split error codes
Every Daikin mini-split code in our database, with plain-English meanings, likely causes, and what to try before calling for service. Codes can vary by model and year — always confirm against the legend on your unit or its manual.
- U4 Transmission error between units
- A1 Indoor PCB defect
- A3 Drain level too high / clog
- A5 Overheating or anti-icing of indoor heat exchanger
- E5 Compressor overload
- E7 DC fan lock (outdoor unit)
- U0 Refrigerant shortage safety
- U2 Power supply / voltage abnormality
- F3 Discharge pipe temperature control fault safety