Daikin error codes and what they mean · Israel

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.

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