A1  Micro-computer in PCB is not working – this is a fault that occurs either in the assembly of the PCB or due to an external factor, such as noise.

A3  Drain level is too high – This is caused by a clogging of dirt in the drain, or a faulty drain pump.

A5  Overheating or freezing of indoor heat exchanger – This could be caused by a dirty air filter, a short circuit or trouble with the sensor in the heat exchange.

A6  Fan motor error – The fan motor is either locked, overloaded or is suffering from a faulty connection.

A7  Swing flap motor error – A fault with the swing flap motor, or a faulty connection.

AH  Dust collector error – A fault with the dust collector, or an element of it may be dirty.

AJ  Capacity setting error – The capacity or address setting is faulty.

C3  Abnormal water level sensor resistance – The water level sensor has either disconnected, short circuited or developed a fault.

C4  Abnormal resistance level of indoor heat thermistor – This means the thermistor has either become disconnected or it has short circuited.

C9  The resistance of the indoor unit suction air thermistor is abnormal – Either a disconnection of the cable, or a short circuit has occurred.

CE  Abnormal radiation thermistor resistance – A faulty thermistor, disconnected cable or a short circuiting of the thermistor could be the source of the issue.

CJ  Abnormal remote controller thermistor resistance – The built in remote has encountered a fault.

E0  Outdoor unit protection devices activated – The refrigerant piping system could be clogged, there may be insufficient refrigerant or there could be a fault with the compressor/fan motor.

E3  High pressure is too high (HPS activation) – The condenser may have short circuited or overloaded, or the heat exchanger may be dirty.

E4  Low pressure is too low (LPS activation) – The refrigerant piping system may be clogged, there may be insufficient refrigerant or the the LPS switch could be faulty.

E5  Overheating of compressor (OL activation) – Refrigerant piping system could be clogged, there may not be enough refrigerant, or there could be a fault with the OL or the connection.

F3  Outdoor unit discharge temperature is too high – Insufficient refrigerant, clogged refrigerant piping or the discharge temperature thermistor could be faulty.

H9  Abnormal resistance of the outdoor air temperature thermistor – The outdoor air thermistor could be faulty, there may be a cable disconnection or the thermistor itself may have short circuited.

J5  Abnormal resistance of the suction pipe temperature thermistor – There could be a faulty suction pipe thermistor, the cable could be disconnected or your thermistor may have short circuited.

J6  Abnormal resistance of the outdoor heat exchanger thermistor – Either a faulty or short circuited outdoor heat exchanger thermistor, or the cable may be disconnected.

P1  Open phase power voltage imbalance – This means there’s a three phase or open phase voltage imbalance.

U0  Suction pipe temperature is too high – A fault with the refrigerant piping system – either clogging or a lack of refrigerant, or there may be a fault with the expansion valve.

U1  Reverse phase – The three phase power supply has been reversed.

U2  Open phase or power voltage imbalance – There may be an open phase or a voltage imbalance in the power supply. There also could be a power failure or the DC voltage of the fan motor could be too low.

U4  Communication error between indoor and outdoor units/outdoor and BS units – A mistake with the interconnection wires, or an indoor/outdoor PCB fault.

U5  Communication error between indoor unit and remote controller – A possible mistake with the interconnection wires, or a PCB fault with the indoor/outdoor remote controller.

UA  Combination error of indoor/BS/outdoor unit, setting error of PCB at site – There is an incorrect combination of indoor, BS or outdoor units 

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