Error codes for LG air conditioners: decoding of fault codes and tips for eliminating them

Operating a good air conditioner makes life much easier in the summer heat.Cool, fresh air makes you feel more comfortable, fills you with energy and the desire to act. And during the off-season, when the central heating is not yet working at full capacity, the air conditioner can be safely used as a source of additional heating.

LG equipment has an excellent reputation, and the air conditioning systems of this brand are no exception. However, in the operation of any device, difficulties may arise related not only to the quality of the device itself, but also to the conditions of its operation. Typical error codes for LG air conditioners promptly signal problems and possible malfunctions that will soon have to be eliminated if the equipment continues to operate in the same mode.

However, knowing the explanation of the error that has occurred, owners will be able to independently diagnose potential breakdowns and adjust the operating conditions of the device. In this material we will tell you what error codes for air conditioners from a popular South Korean brand indicate, what errors can be eliminated without calling a specialist, and when the services of a specialist should not be neglected.

Self-diagnosis of LG air conditioner

Difficult working conditions, intense load or incorrect calculations when designing the entire air conditioning system can have a detrimental effect even on an expensive premium air conditioner.However, the self-diagnosis function that LG climate control equipment has makes it possible to timely detect and neutralize the reasons why the device may fail.

The air conditioner independently launches certain diagnostic processes at each stage of operation, checking the performance of a particular unit.

If certain problems are detected during monitoring, the operation of the device is blocked by the control microcontroller, and the device itself issues a specific error signal. It can be represented in the form alphanumeric message on the display or displayed via blinking of certain diodes on the block. The number of flashes of an individual diode is interpreted as an individual error code.

The device must be repaired by a specialist. However, independently deciphering the error code will allow the owner to assess in advance the complexity of the upcoming work to restore the operation of the air conditioner

The display of errors in LG air conditioners has a certain feature. If the internal self-diagnosis system detects several faults, the unit first generates an error signal with the lowest serial number. Each subsequent code will be displayed in ascending order.

For example, if there is an open circuit in the system (error C2 or C4) and the fan of the external unit does not rotate (error C9), then the air conditioner will first indicate the open circuit, after which it will signal that the rotation of the blades in the external unit has stopped.

Interpretation of LED blinking

As described above, the indoor unit of a home split complex is equipped with a special diode. When certain malfunctions occur in the air conditioning system, this lamp begins to flash.The flash can be made from one to ten times, signaling a specific error. In this case, the interval between a series of blinking diodes in the LG air conditioner is 3 seconds.

Error 1 is expressed in a single blinking of the lamp once every 3 seconds and indicates a break or short circuit in the internal unit of the split system, which causes breakdowns in the board. To fix the problem, check the operation of thermistors in the indoor unit and, if necessary, replace these components.

Error 2 (the diode blinks twice) indicates a similar problem with thermistors installed in the external unit.

Neutralization of the breakdown occurs in the same way: the temperature sensors of the incoming air or the temperature of the gas circuit tube are checked, but already external unit, and they are replaced.

The air temperature sensor in an air conditioner is far from the most expensive part. Therefore, you should not be afraid of replacing it, since repair work of this type is quite affordable

Error 3 (3 flashes) is related to the installation of the system and occurs when the air conditioner operates at the same time for heating and cooling. You need to check the correct connection of the wires, the interconnect cable and the correct connection of the air conditioner.

Error 4 (4 flashes) indicates the start of the compressor protection system, which is overloaded. To eliminate this, check the operation of the thermal relay of the outdoor unit, record the current load and gas pressure in the system. These measures will help to find out the reason why the compressor may fail.

Error 5 (5 blinks) occurs when data exchange between the apartment and the external unit is incorrect.With this code, cable lines are checked, in which a break or short circuit may occur. After diagnostics, it may be necessary to replace the interconnect connections.

Error 6 (6 blinks) appears after a short-term increase in current consumption in the outdoor unit. In such a situation, all actuators of the external unit and key power relays are checked.

Error 7 (7 flashes) also indicates that the current in the outdoor unit is exceeded, but in this case the consumption threshold is outside the normal range for a long time. For diagnostics, it is necessary to check the refrigerant pressure in the system and eliminate malfunctions of all elements in the external unit.

High refrigerant pressure in any brand of air conditioner can lead to coolant leakage, which will inevitably lead to more serious repair work. In some cases, it is impossible to fix such a problem on site, so the technician will have to dismantle the entire unit

Error 8 (8 flashes) indicates problems with the fan motor. In addition to directly checking this unit, it is necessary to examine the elements of its control circuit and contact terminals.

Error 9 (9 flashes) requires checking the operation of the 4-way valve.

Error 10 associated with a short circuit or break, which could cause a breakdown of the thermistor responsible for monitoring the temperature of the built-in compressor housing. After diagnosis, the thermistor will most likely need to be replaced.

What do LG split system errors say?

In addition to blinking LEDs, typical LG air conditioner fault codes may have alphanumeric display. Such a system is also present in the extremely popular series Art Cool, represented by elegant wall-mounted air conditioners.The meaning of deciphering codes using this technology has much in common with the interpretation of LED blinking.

Typical errors regarding short circuit or open circuit in individual sections have the following meanings:

• C1 (CH1) – a short circuit in the internal air temperature sensor or an open circuit in the same circuit.
• C2 (CH2) – short circuit or open circuit in the evaporator temperature sensor.
• C4 (CH4) – open circuit or short circuit at the condenser temperature sensor.
• C10 (CH10) – open or short circuit in the thermistor for controlling the temperature of the compressor housing.

Apart from these errors there are also others.

Take a closer look at them below:

• C3 (CH3) – simultaneous heating and cooling of air.
• C5 (CH5) – problems in the connection between the external and apartment blocks.
• C6 (CH6) – a short-term increase in current in the outdoor unit relay or excess current in the inverter module circuit.
• C7 (CH7) – a prolonged increase in current consumption in the entire external unit or excess current in the compressor.
• C8 (CH8) – fan stop in the indoor unit.
• С9 (СН9) – failure of the 4-way valve or malfunction of the fan of the external unit.

Errors indicating problems with compressor, should not be ignored. It is advisable to perform diagnostics, find the cause of the breakdown and eliminate it.

The compressor in an air conditioner is one of the most important and expensive components. Therefore, it is extremely important to be attentive to the errors that are associated with it

There are also letter errors. Yes, error SA indicates a high discharge temperature - over 130 degrees.

Code SS indicates errors in the internal volatile memory of the device.

Designation CD serves as a signal of problems in the inverter module.

Text symbols Ro And Lo are not errors. The first code indicates that the system is operating in energy-saving mode, the second indicates that it has passed the equipment testing phase.

Errors of brand inverter air conditioners

Displaying self-diagnosis results inverter line of air conditioners brand may be blinking of several diodes on the block. The error code is calculated based on the number of flashes. For example, if one LED flashes 5 times and the second 3 times, the fault code is 53.

One lamp can also blink, alternating colors. The error code is calculated using a similar algorithm: flashes of one color are counted, their number will become the first digit in the code, and the second, the number of flashes of which is interpreted as the second digit of the code.

High and low pressure sensors cut into the freon line of a household air conditioner. Visually, these sensors do not differ from each other, but have different technical parameters

The probable causes of breakdowns with such errors usually relate to problems with voltage, open or short circuit in individual nodes.

They lie in the following errors:

• 22 – the current in the compressor exceeds 14 A.
• 23 – DC voltage after the conversion module does not reach 140 V.
• 24 – opening of pressure sensors, too high or low pressure readings.
• 25 – high or low supply voltage.
• 27 – problems with the reactor, inductor.
• 28 – DC circuit voltage is 420 V.
• 40 - short circuit.
• 41 – short circuit or break in the D-Pipe sensor.
• 44 – short circuit or break in the incoming air temperature sensor.
• 45 – the capacitor sensor is shorted or broken.
• 46 – short circuit or break of the sensor on the suction tube.
• 51 – power overload.
• 54 – the need to change the phase (typical of systems with three-phase power supply).
• 60 – EEPROM (internal non-volatile memory) errors.

Indicates compressor overload error 21. A error 26 – error detection position. They talk about connection problems errors 52 And 53.

If a connection error occurs between the outdoor and indoor air conditioner units, the exchange of data between the system elements is disrupted. To correct the breakdown, it may be necessary to replace the interconnect cables

There are also frequent errors regarding the increase/decrease in temperature of individual components:

• 32 and 33 – high temperature in the discharge pipe.
• 47 – problems with the D-Pipe sensor.
• 48 – malfunctions with the D-Pipe sensor or air temperature sensor (short circuit or break).
• 61 – high temperature in the condenser tube.
• 62 – high temperature in the radiator.
• 63 – low condenser temperature.
• 65 – short circuit or break in the radiator temperature sensor.

You may also encounter problems such as blocking the electric motor in the outdoor fan - error 67 and loss of communication between the main control board and the fan control module - error 105.

How to troubleshoot LG air conditioner?

Awareness of current shortcomings in the operation of equipment makes it possible to eliminate them yourself.

But, unfortunately, the owner of an air conditioner cannot correct every mistake.

In fact, repairing an LG air conditioner with your own hands is possible only in isolated cases, when errors detected during self-diagnosis of the device indicate basic malfunctions

If your LG air conditioner provides information about complex breakdowns, you should definitely invite a certified service technician.You first need to restart the air conditioner: perhaps after a reboot the error will disappear.

You will have to resort to the services of a specialist if the device indicates the following malfunctions:

• problems with the compressor;
• errors in the operation of electronic control system units;
• refrigerant leak;
• improper operation of the electric motor.

The user can independently unlock the blinds if foreign objects interfere with their normal operation. And cleaning equipment or scheduled replacement of filters and solving problems with the power supply of the device.

Recent work related to installation voltage stabilizer, because often complications in the operation of the air conditioner arise precisely because of the unstable current supply in the electrical networks.

It is worth remembering that it is highly undesirable to disassemble the device yourself. In addition to the irreparable damage that the owner can cause to the equipment due to lack of knowledge and skills, you may lose free warranty service.

Conclusions and useful video on the topic

Review of three top air conditioner models Art Cool series presented in the video below:

In the following video, the master shows how to repair an LG air conditioner if there is a freon leak:

And in this video, a specialist talks about the consequences of error C9 (CH9) - replacing a 4-way valve:

Self-diagnosis of the air conditioner allows you to find the problem in time and save expensive equipment. LG climate control equipment provides high-quality monitoring of internal systems and quickly informs the owner about current problems.

To fix most problems, you will need the services of a specialist.However, knowledge of the definitions of typical errors will help the user prepare for air conditioner repair and calculate the approximate cost of future work.

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