Daikin Air Conditioning

An external protection device has been activated, which is preventing the air conditioner from operating.

There is a defect with the main circuit board inside the indoor unit.

The system has detected conditions that could lead to freezing, possibly due to restricted airflow or low refrigerant.

The unit has detected a high water level, likely in the condensate drain system.

The system has activated freezing protection. This is often due to insufficient airflow over the indoor coil.

The air conditioner is in a protection mode, either for heating or to prevent freezing during cooling.

The fan motor in the indoor unit is experiencing a failure.

The motor that controls the air outlet louvres (vents) has failed.

There is an issue with the power supply to the indoor unit.

The Electronic Expansion Valve (EEV) has a defect or is not functioning correctly.

Similar to A9, this code indicates a malfunction with the electronic expansion valve that regulates refrigerant flow.

The heating element in the unit has overheated, likely due to airflow obstruction or a faulty sensor.

A high water level has been detected while the thermostat is off. This is similar to A3 but specific to thermo-off.

There is a defect with the dust collection system or its element.

The system's capacity settings are incorrect or missing.

A general sensor malfunction has been detected within the indoor unit.

Communication has failed between the main and sub printed circuit boards (PCBs).

The sensor that monitors the water level in the drain pan or line is not working correctly.

The sensor measuring the temperature of the indoor coil has an open or short circuit.

The sensor measuring the temperature of the suction pipe has an open or short circuit.

The driver controlling the fan motor has failed.

The motor responsible for operating the front panel has a fault.

The system's sensor for monitoring incoming AC current is faulty.

The sensor measuring the temperature of the air returning to the unit is open or short circuited.

The sensor measuring the temperature of the air being discharged from the unit is open or short circuited.

The humidity sensor within the unit has failed.

The temperature sensor located within the switch box of the indoor unit is malfunctioning.

The high-pressure safety switch has activated or is malfunctioning.

Indicates a problem with the air cleaner's dust collection system.

The sensor connected to the remote controller has a defect.

One or more protection devices in the outdoor unit have been triggered.

There is a defect with the main circuit board in the outdoor unit.

The system's earth leakage detection system has an issue, possibly a faulty sensor or connection.

The high-pressure switch in the outdoor unit has been tripped.

The low-pressure switch in the outdoor unit has been tripped.

The inverter compressor has either locked up or is overheating.

The Direct-On-Line (DOL) compressor has locked up, likely due to high current draw.

The fan motor in the outdoor unit has failed.

The inverter compressor is drawing excessive current.

The Electronic Expansion Valve (EEV) motor in the outdoor unit has failed.

The 4-way valve, which changes the system's operation between heating and cooling, has a defect.

The temperature of the water entering the unit is abnormal.

There is a defect within the thermal storage unit's components.

A 'wet alarm' suggests a moisture detection issue, possibly related to leaks or condensation.

System pressure is too high, likely due to too much refrigerant.

The high-pressure switch (HPS) has activated due to excessively high system pressure.

The compressor is reporting abnormal oil pressure, which is critical for lubrication.

The discharge temperature within the unit has exceeded 110°C.

The oil within the compressor has become excessively hot.

This code is specific to systems with an engine (like a generator backup) and indicates high exhaust temperature.

High pressure is detected in the system during cooling, or the unit is overcharged with refrigerant.

All sensors related to the compressor system have become disconnected.

The damper system for the humidifier is experiencing a failure.

Either the room temperature sensor or the damper for the humidifier unit is faulty.

The high-pressure switch has an open circuit, indicating a potential pressure issue or switch failure.

The low-pressure switch has an open circuit, suggesting a possible pressure issue or switch fault.

The sensor designed to detect compressor overload has failed.

There is an error in detecting the compressor's position.

The signal related to the fan motor operation is faulty.

There is an error with the input signal to the compressor.

The sensor measuring the outside ambient temperature has failed (open or short circuit).

The temperature sensor measuring the outdoor air temperature is malfunctioning.

A pressure sensor within the system has failed.

The sensor that measures electrical current has failed.

The sensor measuring the temperature of the discharge pipe has an open or short circuit.

The sensor for the outdoor coil's vapour line has an open or short circuit.

The sensor measuring the temperature of the suction pipe has an open or short circuit.

The sensor measuring the temperature of the outdoor coil has an open or short circuit.

The sensor measuring the temperature of the liquid pipe has an open or short circuit.

Another sensor for the liquid pipe temperature has an open or short circuit.

The sensor for the sub-cool heat exchanger has an open or short circuit.

The sensor that measures high pressure has an open or short circuit.

The sensor that measures low pressure has an open or short circuit.

The sensor measuring the oil temperature has an open or short circuit.

There is a failure within the inverter system of the air conditioner.

The main circuit board for the inverter system has failed.

The temperature inside the electrical box has exceeded 120°C while the compressor is off.

The temperature of the unit's fins has exceeded 93°C.

The inverter system experienced a sudden surge in DC over current.