Modern refrigerators of the South Korean company LG are deservedly considered one of the most reliable units on the household appliances market. However, even the most advanced mechanisms, such as linear inverter compressor, can fail over time or require the intervention of a master. The owner often notices the problem too late, when the food has already begun to deteriorate, and a puddle or ice has formed inside the chamber.
Understanding what exactly can break helps not only save the budget on repairs, but also prevent a complete loss of food supplies. Statistics from service centers show that most critical failures have preceding symptoms that are ignored by users. In 80% of cases, premature failure of the compressor is caused by a malfunction in the control circuit or defrost system, and not by the natural wear and tear of the motor itself.
In this article we will analyze in detail the main components that are prone to breakdowns and explain how to diagnose the problem by external signs. You will find out why the unit hums, why the light does not turn on, or why a “fur coat” forms on the back wall. Competent diagnostics is the first step to restoring the performance of your equipment.
Problems with the cooling system and compressor
The heart of any refrigerator is the compressor, and models LG most often have linear inverter models installed. They are quiet and energy efficient, but their electronics are sensitive to power surges. If you notice that the refrigerator hums, but does not freezeor the motor starts for a few seconds and immediately turns off, this is an alarming signal.
Often owners confuse a noisy inverter with a breakdown. Inverter motors do not turn off completely, but only change speed, so a low hum or crackling noise may be normal. However, if the sound becomes similar to a knocking, grinding or loud hum, similar to the operation of a tractor, it means mechanical destruction of internal components or wear of the bearings.
Another common problem is overheating of the compressor. This may occur due to contamination of the condenser (grid at the back) or a malfunction of the fan. If the motor overheats, thermal protection is triggered, and the unit goes into a long “rest”, ceasing to cool the chambers.
- 🔨 A loud knock or clanging sound during startup indicates destruction of the compressor suspension or valve group.
- 🔥 Excessive heating of the rear wall (more than 50-60 degrees) indicates problems with heat exchange or refrigerant circulation.
- ❄️ A complete lack of cold when the engine is running indicates a freon leak or capillary tube blockage.
⚠️ Attention: Attempting to replace the compressor yourself without special equipment for evacuation and refilling with freon will lead to permanent damage refrigerator. These works require a license and skills.
Malfunctions of the No Frost and defrosting system
Refrigerators LG with the system No Frost relieve the user of the need for manual defrosting, but this system consists of many elements that can break. The basic principle of operation is the circulation of cold air and periodic automatic defrosting of the evaporator. If this cycle is disrupted, a “fur coat” begins to grow in the freezer, which blocks the air supply channels.
Most often, Defrost heating element or the defrost sensor fails. When the heating element burns out, the ice on the evaporator does not melt during a pause in compressor operation. Over time, the ice lump grows, the fan begins to touch it with its blades, emitting a characteristic crackling sound, and the cold stops flowing into the main chamber.
The defrost sensor (defrost thermostat) is also a consumable item. If it “sticks” or gives incorrect readings, the control board may either not turn on the heating at all, or, conversely, heat the evaporator for too long, which is dangerous for the plastic parts inside the case.
Diagnostics of the defrost system often requires partial disassembly of the freezer chamber for a visual inspection of the evaporator. If you see a massive layer of ice hiding the radiator fins, the problem lies in the defrost unit. In some models LG there is a factory defect in the wiring going to the heating element, which is ground or oxidized.
Electronic control boards and sensors
A modern refrigerator LG is a complex computer that controls temperature conditions. The main element here is control module. Power surges are the main enemy of electronics. If the refrigerator suddenly stops responding to buttons, the display goes dark or, conversely, shows chaotic symbols, the board is most likely burned out.
In addition to the main board, the system uses many temperature sensors. They are located at different points: in the freezer, in the refrigerator compartment, on the evaporator and in the blowing zone. If one of thermistors fails (changes resistance), the “brain” of the refrigerator receives incorrect information. For example, the sensor may “say” that the chamber is -30°C, although it is +10°C. In this case, the compressor will not turn on, and the products will deteriorate.
Symptoms of electronic malfunction often manifest themselves in blinking indicators. Models LG have a self-diagnosis function: a certain combination of flashing lights indicates a specific node. You can decipher the error code in the instructions or using the service manual.
Error codes on the display
Er FF - freezer fan error; Er FS - freezer sensor error; Er RS - defrost sensor error. The exact codes depend on the model.
It is important to consider that electronics are sensitive not only to voltage, but also to humidity. Condensation dripping onto the control board (often due to a clogged drain) causes short circuits and corrosion of the contacts. In such cases, repairs may be unprofitable.
Problems with door seals and tightness
It would seem that a rubber strip could break? However sealing rubber (cuff) plays a critical role in energy efficiency. If the door does not fit tightly, warm, moist air constantly enters the chamber. The compressor is forced to wear out, trying to compensate for heat loss, which leads to its overheating and breakdown.
Over time, the rubber loses its elasticity, cracks or deforms. In refrigerators LG with the “Door-in-Door” system (door-in-door), the opening mechanisms of additional doors can also jam or break, violating the tightness of the external circuit.
You can check the tightness in a simple way: hold a sheet of paper between the door and the body and try to pull it out. If the paper is removed without force in several places, the seal requires replacement or adjustment of the hinges.
- 🚪 A skewed door is often a consequence of overweight shelves or uneven installation of the refrigerator itself.
- 🧊 Ice at the bottom of the doorway is a sure sign that warm air is penetrating from below through a leaky clamp.
- 🔍 Cracks in the rubber may not be visible to the eye, but allow air to pass through; run your hand along the seal to find any irregularities.
⚠️ Attention: When replacing the seal on models with magnetic tape, it is important to set the angles correctly. Incorrect insertion of the magnet into the corner will cause the door to open by itself.
Mechanical damage and problems with the housing
Although this happens less often than electronic failures, mechanical damage can render the equipment unusable. First of all, we are talking about the breakdown evaporator. In modern refrigerators LG the evaporator is often made of aluminum tubes “foamed” into the wall of the case. Aluminum is very soft.
Users often damage the evaporator when trying to remove frozen food with a knife or sharp spatula. Even a microscopic puncture leads to an instant release of everything refrigerant (freon) out. The refrigerator stops freezing, and repairs require a complex procedure for finding leaks, soldering and refilling.
Mechanical problems also include breakage of plastic elements: shelves, vegetable drawers and guides. Although this does not stop the motor from running, it does become inconvenient to operate. Cheap plastic becomes brittle at low temperatures and bursts from careless movement.
In models with a display on the door, problems are often encountered with the cables connecting the control panel to the main module. If the door is opened frequently (especially in narrow kitchens), the cable breaks and the display stops working.
Diagnostics and table of main symptoms
To understand what exactly happened to your refrigerator LG, you need to compare external signs with possible causes. Self-diagnosis helps the technician quickly determine the scope of work and prepare the necessary spare parts. Below is a table systematizing the main symptoms and probable breakdowns.
Remember that the same symptom (for example, the refrigerator does not freeze) can be caused by different reasons: from a burnt-out relay to a freon leak. Therefore, an integrated approach to diagnosis is mandatory. You should not rely on just one sign.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Humming, but not freezing | Freon leak, breakdown compressor | High (requires a technician) |
| Ice builds up in the freezer | Faulty defrost heating element or sensor | Medium (replacement parts) |
| Water flows inside or outside | Drainage clogged, refrigerator skewed | Low (cleaning/adjustment) |
| Constantly works without turning off | Wear of the seal, lack freon | Medium/High |
| Indicators flash, no cold | Electronics failure, temperature sensors | Medium (board diagnostics) |
It is important to understand that some malfunctions may be related to operating conditions. For example, if the refrigerator is located next to the battery or in direct sunlight, the cooling system may not cope even if it is in full working order.
☑️ Primary diagnostics before calling a technician
Prevention and extension of service life
To avoid costly repairs, you must follow simple operating rules. Regular cleaning the condenser from dust and pet hair is a procedure that every owner can perform. It is enough to vacuum the grille at the back or bottom of the refrigerator once every six months.
It is also important to monitor the temperature conditions. Do not place hot food in the refrigerator - this puts excessive stress on the compressor and leads to the formation of large amounts of condensation. Make sure that food does not block the ventilation holes inside the chambers.
If you are leaving for a long time, it is better to defrost the refrigerator, wash it and leave the doors ajar. This will prevent the appearance of mold and musty odors, which are then very difficult to remove from porous plastic surfaces.
⚠️ Attention: Warranty conditions are subject to change. Always keep your receipts and warranty card. In some cases, independent intervention (for example, replacing the seal on your own) may result in denial of warranty service.
FAQ: Frequently Asked Questions
Why Does your LG refrigerator make a clicking sound?
Clicks may be normal when the thermostat is operating or the plastic is expanding/contracting. However, frequent clicks when trying to start the compressor may indicate a malfunction of the start relay or the motor itself.
Is it possible to replace a linear compressor with a regular one?
Technically this is possible, but requires replacing the control board and reconfiguring the system. Manufacturers do not recommend such replacements, since the calculated efficiency and reliability of the system are violated.
What to do if an unpleasant odor appears in the refrigerator?
First, find and throw away the source of the odor. Wash the chambers with a solution of soda or vinegar. Check the drainage hole - often the smell comes from stagnant water in the pan. Use special odor absorbers.
How often do you need to defrost a No Frost refrigerator?
The No Frost system does not require regular defrosting to remove ice. However, once a year it is recommended to completely turn off the refrigerator for hygienic washing and drying of hard-to-reach places.