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