Daikin error codes and what they mean · Iran
All 11 Daikin fault codes in one table: what each one means, how serious it is and when to call a pro.
| Code | Appliance | What it means |
|---|---|---|
| A1 | air conditioner | A1 means the indoor unit's control board has reported a fault. |
| A3 | air conditioner | The condensate drain is blocked or the water level in the drain pan is too high, which can cause water to leak from the unit. |
| A5 | air conditioner | A protection has triggered, usually from icing or overload. |
| A6 | air conditioner | A fan motor fault: the unit has detected a problem with its fan motor. |
| C4 | air conditioner | A temperature sensor circuit is reporting a fault, usually a failed sensor or a wiring or connection problem in its circuit. |
| C9 | air conditioner | A temperature sensor circuit is reporting a fault, usually a failing sensor or a loose or damaged connection to it. |
| E5 | air conditioner | The compressor is locked or overloaded, often because airflow around the outdoor unit is blocked by leaves or obstructions. |
| E7 | air conditioner | A fan motor fault: the fan motor is not running properly, possibly because something is blocking the fan, grille or outdoor unit. |
| U0 | air conditioner | Refrigerant level is low, possibly from a leak, so cooling is weak. |
| U2 | air conditioner | The supply voltage to the unit is out of range or unstable, usually because of a problem with the mains supply or the installation wiring. |
| U4 | air conditioner | Communication fault between the indoor and outdoor units (or with the remote), usually caused by a wiring, connection or control board problem. |