Modern refrigerators from a South Korean company LG deservedly enjoy a reputation as reliable technology, but even the most advanced systems No Frost may fail over time. The owner of the unit is often faced with a situation when the device stops freezing, begins to make strange sounds, or an alarm indicator lights up on the display. Understanding the nature of these faults allows you to quickly respond and prevent product damage.
In this article we will examine in detail the typical problems that technology users face. LG, from simple drainage blockage to complex compressor breakdowns. We will not delve into the unnecessary theory of thermodynamics, but will focus on the practical aspects of diagnostics and repair methods that can be applied independently or with the assistance of a specialist.
Before sounding the alarm and calling service, it is necessary to conduct a primary visual and auditory diagnosis. Often the reason lies in improper operation or a simple violation of the temperature regime, which can be easily fixed without special tools.
The refrigerator works, but does not freeze: primary diagnostics
The most common complaint from users is this: the motor is humming, the light inside is on, but the temperature in the chambers does not drop to the required values. First of all, you need to check the tightness of the fit rubber seals to the body. If the door does not close tightly, warm air constantly enters and the system cannot cope with cooling.
Another common cause is a faulty thermostat or temperature sensor. In modern models LG with electronic control, a complex control unit is responsible for this process. If the sensor “lies” and shows that it is already -20°C inside, the compressor simply will not turn on, although in reality it may be +10°C there.
⚠️ Attention: If you hear that the compressor starts, runs for a couple of seconds and turns off with a characteristic click, under no circumstances try to start it again immediately. This is a sign of a problem with the starting relay or the motor itself, and frequent starts can permanently damage the unit.
It is also worth paying attention to the condition of the capacitor located on the rear wall. If it is covered with a thick layer of dust, heat transfer is disrupted and the efficiency of the system drops significantly. Regular cleaning of radiator grilles is a simple procedure that prolongs the life of your equipment.
Error codes on the display: decoding LG signals
Refrigerators LG No Frost equipped with a self-diagnosis system that displays error codes on a digital display or by flashing indicators. Understanding these signals greatly simplifies troubleshooting. Code Er FF indicates a problem with the freezer fan, which may have iced up or failed mechanically.
Error Er FS also associated with the freezer, but indicates a faulty defrost sensor. If this sensor does not transmit correct data on the evaporator temperature, the system will not start the defrost mode, which will lead to the formation of an ice coat. Code Er CF indicates problems with air circulation, which is often caused by ice blocking the fan.
Below is a table of the main error codes and their probable causes:
| Error code | Component | Probable Cause |
|---|---|---|
| Er FF | Freezer fan | Icing or open circuit |
| Er FS | Freezer sensor | Sensor or wiring fault |
| Er RS | Refrigerator compartment sensor | Temperature reading error |
| Er DH | Defroster (defrost) | Faulty heating element or timer |
To reset the error, sometimes it is enough to unplug the refrigerator for 10-15 minutes. If after switching on the code appears again, the faulty unit must be replaced. Do not ignore these signals, as prolonged operation with a sensor error can lead to defrosting of food.
Error codes on the LG display are an accurate indicator of a faulty unit, ignoring which leads to more expensive repairs.
Problems with the defrost system and ice formation
System No Frost implies automatic defrosting of the evaporator. If you find drifts of ice in the freezer or frost on the back wall of the refrigerator compartment, then the defrost cycle is broken. Most often the culprit is a burnt out heating element (ten) evaporator. It stops heating, and the moisture does not evaporate, but freezes.
The second important element is the defrost timer or electronic control module. If the refrigerator's "brains" do not give the command to turn on the heater, the ice will build up endlessly until it blocks the fan. The third component is a thermal fuse that opens the circuit when it overheats. If it burns out, the heating element will also not turn on.
☑️Diagnostics of the defrost system
To replace the heating element, it is often necessary to completely defrost the refrigerator within 24 hours. Trying to remove the back panel in a freezer without defrosting may damage the plastic elements or freon pipes. Accuracy here is the key to success.
Extraneous sounds: humming, knocking and clicking
Refrigerator LG should operate relatively quietly. Loud humming, vibration or knocking is a sign of a mechanical problem. Humming is often associated with improper installation: if the unit is not level, the compressor may vibrate against the floor or housing. Adjusting the legs solves this problem in 80% of cases.
Knocks and clanging noises can come from the refrigeration pipes if they touch each other or the housing. In this case, carefully bending the tubes or installing rubber gaskets helps. However, if the sound resembles a metallic clanging inside the compressor, this is a bad sign indicating wear and tear on the internal mechanisms of the motor.
⚠️ Attention: A sharp, single click when turning on or off is the norm (the thermal relay is working). But a series of frequent clicks at intervals of several seconds indicates that the compressor is trying to start, but cannot. This requires immediate attention from an electrician.
Noisy operation of a fan in a No Frost system can be caused by a foreign object getting into the blades or wear of the fan motor bearings. In such cases, a characteristic increasing hum or crackling sound is heard.
Why does the refrigerator make "gurgling" or "spilling" sounds?
The sounds of liquid pouring are normal. A refrigerant (freon) circulates through the tubes, which changes its state of aggregation from liquid to gaseous. If the sound is not accompanied by chassis vibration, there is nothing to worry about.
Compressor and start relay malfunctions
The heart of any refrigerator is compressor. In models LG inverter compressors are often used Linear Inverter, which are characterized by high energy efficiency and low noise levels. However, their electronic filling is sensitive to power surges in the network.
If the compressor does not start but is humming, the problem may be with the start relay or capacitor. In inverter models, a complex electronic unit located at the bottom of the unit is responsible for starting. Its diagnosis requires special knowledge and equipment.
Compressor overheating is another common problem. If the device is standing close to a wall or in a niche without ventilation, the motor overheats and goes into protection mode, turning off for a long time. It is necessary to provide a gap of at least 10 cm from the back wall to the furniture for normal air circulation.
Freon leak and capillary blockage
If the refrigerator runs constantly without turning off, but the temperature does not drop, and there is no frost on the evaporator (or it is local), there is a high probability of a refrigerant leak. Freon can escape through microcracks in the foamed part of the body or through the soldering joints of the tubes. It is impossible to find and eliminate such a leak on your own - you need a technician with a leak detector and evacuation equipment.
A blockage in the capillary tract is a “thrombus” in the cooling system. Often the cause is moisture that gets into the circuit, which freezes in a narrow place in the tube and blocks the freon flow. The symptoms are similar to a leak: the motor runs without stopping, there is no cold, the condenser (grid at the back) is only partially warm.
To prolong the life of the compressor and refrigeration system, never place hot or warm food in the refrigerator. The sudden heating of the internal volume forces the motor to work at its limit, which accelerates wear and promotes the formation of condensation inside the circuit.
Frequently asked questions (FAQ)
Why does the LG No Frost refrigerator emit a plastic smell when first turned on?
This is normal for new technology. When the defrosting heating elements are heated for the first time and the engine is running, the factory lubricant or protective coating may burn out. Usually the smell disappears after 2-4 hours of operation. If the smell persists longer or becomes pungent, check for foreign objects near the heating elements.
How to properly defrost an LG refrigerator if it is covered in ice?
It is necessary to completely disconnect the device from the mains, remove all products and leave the doors open for at least 12 hours (preferably for a day). Strictly prohibited chip the ice with a knife or other sharp objects, as you can break through the evaporator and lose all the freon. You can speed up the process by placing bowls of warm water inside.
Is it possible to replace an inverter compressor with a conventional one?
Technically this is possible, but it requires a complete rework of the electrical circuit, since inverter models are controlled by an electronic board, and conventional ones are controlled by a starting relay. In addition, operating efficiency and noise levels may vary. It is recommended to install only original components LG.
What should you do if the refrigerator is too cold but the freezer is too warm?
Most likely, the cold air supply channel from the freezer to the refrigerator is clogged. This often happens due to the formation of an ice plug. Complete defrosting required. If the problem persists, the airflow control valve or temperature sensor may be faulty.