Error codes for LG air conditioners: decryption of trouble codes and troubleshooting tips

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

LG appliances have an excellent reputation, and the air conditioning system of this brand is no exception. However, in the operation of any device, difficulties may arise associated not only with the quality of the device itself, but also with the conditions of its operation. Typical error codes of LG air conditioners in time signal problems and probable malfunctions, which will soon have to be fixed if the equipment continues to work in the previous mode.

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

Self-diagnosis of the LG air conditioner

Difficult working conditions, heavy load or incorrect calculations whendesigning the entire air conditioning system can adversely affect even expensive premium air conditioning. However, the self-diagnosis function, which has the LG climate technology, makes it possible to detect and neutralize the reasons why the device may fail in time.

The air conditioner independently starts certain diagnostic processes at each stage of operation, checking the operability of a particular node.

If certain problems are found during monitoring, the device’s operation is blocked by the control microcontroller, and the device itself gives a specific error signal. It can be represented as alphanumeric display either displayed through blinking specific diodes on the block. The number of flashes of a single diode is interpreted as a single error code.

The device should be repaired by a specialist. However, self-decryption of the error code will allow the owner to assess in advance the complexity of the upcoming work in restoring the air conditioner

The error display of Lji brand air conditioners has a specific feature. If the internal self-diagnosis system finds several malfunctions, then first the unit gives an error signal with the lowest serial number. Each subsequent code will be displayed in ascending order.

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

Decoding of LED flashing

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

Error 1 expressed in a single flashing of the lamp every 3 seconds and indicates a break or short circuit in the indoor unit of the split system, due to which breakdowns occur in the board. To fix the problem, check the operation of the thermistors in the indoor unit and, if necessary, replace these nodes.

Error 2 (diode blinking twice) signals a similar problem with thermistors that are installed in the external unit.

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

An air temperature sensor in an air conditioner is by no means the most expensive part. Therefore, you should not be afraid of replacing it, since repair work of such a plan is quite affordable

Error 3 (3 flashes) is associated with the installation of the system and occurs when the air conditioner is aimed at both 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 undergoing overload. To eliminate, 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 the data exchange between the apartment and the external unit is incorrect. With this code, the cable lines are tested, which may cause a break or short circuit. After diagnosis, it may be necessary to replace interconnects.

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

Error 7 (7 blinks) also signals an excess of current in the outdoor unit, however, in this case, the consumption threshold goes beyond the norm for a long time. For diagnostics, it is necessary to check the refrigerant pressure in the system and eliminate the malfunctions of all elements in the outdoor unit.

High refrigerant pressure in any type of air conditioner can cause leakage of coolant, which will inevitably lead to more serious repairs. In some cases, it is impossible to fix such a problem locally, so the wizard will have to dismantle the entire unit

Error 8 (8 blinks) indicates a problem with the fan motor.In addition to a direct check of this unit, it is necessary to examine the elements of its control circuit and contact terminals.

Error 9 (9 flashes) requires a 4-way valve test.

Error 10 It is connected with a short circuit or open circuit, which could cause a breakdown of the thermistor responsible for controlling the temperature of the case of the built-in compressor. After diagnosis, the thermistor will most likely need to be replaced.

What do LG split system errors say?

In addition to flashing LEDs, typical air conditioner LG codes may have alphanumeric display. Such a system is also present in the extremely popular series. Art coolpresented by elegant wall-mounted air conditioners. The meaning of the decryption of codes by this technology in many respects echoes the interpretation of blinking LEDs.

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 in the same circuit.
• C2 (CH2) - Short circuit or open circuit in the evaporator temperature sensor.
• C4 (CH4) - open or short in the circuit at the temperature sensor of the condenser.
• C10 (CH10) - open or short in the thermistor of the temperature control of the compressor housing.

In addition to these errors, there are others as well.

Consider them in more detail below:

• C3 (CH3) - simultaneous heating and cooling of air.
• C5 (CH5) - problems in the connection between the external and apartment blocks.
• C6 (CH6) - short-term increase in current in the relay of the outdoor unit or excess current in the circuit of the inverter module.
• C7 (CH7) - a continuous increase in current consumption in the entire outdoor unit or excess current in the compressor.
• C8 (CH8) - fan stop in the indoor unit.
• C9 (CH9) - breakdown of the 4-way valve or malfunction of the fan of the outdoor unit.

Errors indicating problems with compressorDo not ignore. It is advisable to carry out diagnostics, detect the cause of the breakdown and eliminate it.

The compressor in the air conditioner is one of the most important and expensive components. Therefore, it is imperative that you carefully consider the errors that are associated with it.

There are also letter errors. So, mistake CA says a high discharge temperature - over 130 degrees.

The 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 characters Ro and Lo are not errors. The first code talks about the system in energy-saving mode, the second - about passing the testing phase of the equipment.

Mistakes inverter air conditioners brand

Display self-test results inverter line conditioners brand may be flashing multiple diodes on the block. The error code is calculated by the number of flashes. For example, if one LED flashes 5 times and the second 3, the fault has code 53.

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

High and low pressure sensors crash into the freon line of a domestic air conditioner. Visually, these sensors do not differ from each other, however, they have different technical parameters

The probable causes of failures with such errors usually relate to problems with voltage, open circuit 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 pressure sensors, too high or low pressure readings.
• 25 - high or low voltage.
• 27 - problems with the reactor, inductor.
• 28 - DC circuit voltage is 420 V.
• 40 - short circuit.
• 41 - Short circuit or open circuit in the D-Pipe sensor.
• 44 - short circuit or open circuit of the inlet air temperature sensor.
• 45 - the capacitor sensor is closed or broken.
• 46 - short circuit or open sensor on the suction tube.
• 51 - power overload.
• 54 - the need for a phase change (characteristic of systems with three-phase power supply).
• 60 - EEPROM (internal non-volatile memory) errors.

Compressor overload signals error 21. AND error 26 - position for detecting errors. Connection problems talked about errors 52 and 53.

If an error occurs in connecting the outdoor and apartment units of the air conditioner, the exchange of data between the elements of the system is disrupted. Corrections may require replacement of interconnect cables.

Mistakes related to raising / lowering the temperature of individual nodes are also common:

• 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 open).
• 61 - high temperature in the condenser tube.
• 62 - high temperature in the radiator.
• 63 - low temperature of the condenser.
• 65 - short circuit or open radiator temperature sensor.

You can still encounter problems such as blocking an electric motor in an 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 the equipment makes it possible to independently eliminate them.

But, unfortunately, the owner of the air conditioner can not fix every mistake.

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

If LG air conditioning provides information on complex breakdowns, you should definitely invite a certified service technician. You must first restart the air conditioner: it is possible that after a reboot the error will disappear.

You will have to resort to the services of a wizard if the device signals such malfunctions:

• malfunctions in the compressor;
• errors in the operation of electronic control system blocks;
• refrigerant leakage;
• improper operation of the electric motor.

The user can independently engage in unlocking the blinds if foreign objects interfere with their normal operation. Andcleaning 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 electric networks.

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

Conclusions and useful video on the topic

Review of three top models of air conditioners Art Cool Series presented in the video below:

In the following video, the wizard shows how the repair of the LG air conditioner occurs when Freon leaks:

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

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

To fix most of the problems, a specialist will be required. However, knowledge of the decoding of typical errors will help the user to prepare for the repair of the air conditioner and calculate the approximate cost of future work.

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