Daikin Error Code Reference — All 48 Codes
Complete Daikin error code cheat sheet. All 48 fault codes with plain-English explanations and direct links to fix guides.
Use this page when your Daikin furnace, air conditioner, heat pump, or mini split is flashing a fault. Start with the exact code, then open the fix guide to diagnose airflow, ignition, sensor, pressure switch, board, or communication problems before you order parts or book a service call.
Tip: search the exact brand, model, and code together, for example "Daikin error code 13" or "Daikin pressure switch fault".
| Error Code | What It Means | Guide |
|---|---|---|
| Daikin A3 Error Code | Causes & Fix | Fix → |
| Daikin A6 Error Code | Indoor Fan Motor Fix | Fix → |
| Daikin C4 Error Code | Heat Exchanger Coil Sensor: Causes & Fix | Fix → |
| Daikin C4 Error Code | Indoor Heat Exchanger Thermistor Fix | Fix → |
| Daikin C9 Error Code | Compressor Discharge Temperature Sensor Fault | Fix → |
| Daikin Chiller Fault Codes | Complete Troubleshooting Guide | Fix → |
| Daikin E1 Error Code Fix | Indoor Sensor Fault | Fix → |
| Daikin E2 Error Code | Causes & Fix | Fix → |
| Daikin E3 Error Code | Causes & Fix | Fix → |
| Daikin E4 Error Code | Causes & Fix | Fix → |
| Daikin E5 Error Code | Causes & Fix | Fix → |
| Daikin E6 Error Code | Causes & Fix | Fix → |
| Daikin E7 Error Code | Outdoor Fan Motor Fault Fix | Fix → |
| Daikin E8 Error | Causes & Fix | Fix → |
| Daikin E9 Error Code | Causes & Fix | Fix → |
| Daikin F3 Error Code | Causes & Fix | Fix → |
| Daikin F9 Error Code | Heat Exchanger Temp Sensor Fault: Causes & Fix | Fix → |
| Daikin Fit Error Codes | Inverter Heat Pump Diagnostic Guide | Fix → |
| Daikin FTXS09LVJU Problems & Error Codes | U4 communication error is most common, usually caused by loose indoor-outdoor wiring or connector corrosion at the outdoor board. | Fix → |
| Daikin FTXV09AVJU9 Ductless Mini Split Problems & Error Codes | Most FTXV09AVJU9 failures show an error code on the controller with a blinking operation lamp. Read the exact code to identify the fault. | Fix → |
| Daikin FTXV18AVJU9 Ductless Mini Split Problems & Error Codes | Communication errors (U4/U5 codes) are most common on this model, usually caused by loose wiring between indoor and outdoor units or at the remote controller. | Fix → |
| Daikin H6 Error Code | Indoor Fan Motor Lock Fault Fix | Fix → |
| Daikin J3 Error Code | Discharge Pipe Temperature Sensor Fault Fix | Fix → |
| Daikin L5 Error Code | Compressor Lock Fault | Fix → |
| Daikin L5 Error Code | Compressor Lock Fix | Fix → |
| Daikin Mini Split Blowing Warm Air | Causes & Fix | Fix → |
| Daikin Mini Split Error Codes | Complete Reference | Fix → |
| Daikin Mini Split Ice on Coils | Causes & Fix | Fix → |
| Daikin Mini Split Leaking Water | Causes & Fix | Fix → |
| Daikin Mini Split Not Cooling | Causes & Fix | Fix → |
| Daikin Mini Split Not Heating | Causes & Fix | Fix → |
| Daikin Mini Split Won't Turn On | Causes & Fix | Fix → |
| Daikin R-32 System U4 Error Code | Communication Fault Fix | Fix → |
| Daikin RXQ VRV System Error Codes (Outdoor Unit): Complete Guide | Daikin RXQ VRV outdoor unit error codes and fault diagnostics. U-series fault codes, causes, and technician-level troubleshooting. | Fix → |
| Daikin RXYQ VRV System Error Codes | Complete Fault Code Guide | Fix → |
| Daikin U2 Error Code | Causes & Fix | Fix → |
| Daikin U3 Error Code | Causes & Fix | Fix → |
| Daikin U4 Error Code | Causes & Fix | Fix → |
| Daikin U4 Error Code | Indoor-Outdoor Communication Fix | Fix → |
| Daikin U5 Error Code | Causes & Fix | Fix → |
| Daikin U6 Error Code | Causes & Fix | Fix → |
| Daikin U7 Error Code | Causes & Fix | Fix → |
| Daikin U8 Error Code | Causes & Fix | Fix → |
| Daikin U9 Error Code | Causes & Fix | Fix → |
| Daikin UA Error Code | Mismatched Indoor/Outdoor Unit Fix | Fix → |
| Daikin VRV / VRF U4 Error Code | Communication Fault Fix | Fix → |
| Daikin VRV E7 Error Code | Causes & Fix | Fix → |
| Daikin VRV System Error Codes: Complete Guide | Complete guide to Daikin VRV (Variable Refrigerant Volume) system error codes. Covers U, E, A, C, F, and H-series codes with causes and technician fixes. | Fix → |