The situation when LG refrigerator ceases to perform its direct functions takes any owner by surprise. You open the door, and it’s warm, the food starts to spoil, and panic arises. The system No Frost, designed to save us from manual defrosting, sometimes fails, and it is important to quickly understand whether the problem can be fixed on your own or whether you need to call a specialist.
In this article we will analyze in detail why the unit could fail. We will consider both banal operating errors and complex technical malfunctions, such as refrigerant leak or failure of electronics. Understanding the root of the problem is the first step to restoring the cold in your home.
Before diagnosing a breakdown, you should make sure that the device is even plugged in. Sometimes a simple power outage or damage to the plug goes unnoticed. Check whether power indicator on the control panel or inside the chamber is lit.
Faults in the defrost system and sensors
One of the most common reasons why LG refrigerator stops freezing is defrost system failure. In models with No Frost the evaporator is hidden behind the back wall, and if it is covered with ice, cold air simply cannot circulate through the chambers. Responsible for this process is Defrosting heating elementwhich periodically heats the evaporator, melting the ice.
If the heating element is burned out, ice accumulates, blocking ventilation. Also often the defroster fails, which tells the control unit that it is time to stop heating. If this sensor is “lying,” the system may either not start defrosting at all, or heat the evaporator for too long. defrost sensor (defroster), which tells the control unit that it is time to stop heating. If this sensor is lying, the system may either not start defrosting at all, or heat the evaporator for too long.
⚠️ Attention: If you hear the fan inside the refrigerator humming or crackling, but the cold does not flow, most likely the fan blades have hit an ice plug on the evaporator.
Diagnostics of these elements requires testing with a multimeter. The heating element should show resistance within normal limits, and the sensor should change readings depending on the temperature. Replacing these parts usually does not take much time, but requires partial disassembly of the freezer.
It is important to note that some models LG use fuse (thermal fuse), which is in series with the heating element. If it blows, the circuit breaks and heating does not occur at all, which leads to icing and cooling stops.
Problems with the compressor and start relay
Compressor —this is the heart of the refrigerator. If it is not working, the refrigerant does not circulate through the system and no cold is produced. LG refrigerators often feature inverter compressors, which are characterized by quiet operation and smooth start-up, but their repair is more difficult than that of conventional linear models.
A common cause of failure is start relay. This small element is responsible for starting the engine. If the relay burns out, you may hear a characteristic click, after which the compressor hums for a couple of seconds and turns off. This is a protective reaction that prevents combustion of the motor windings.
- 🔊 Symptom: Loud clicking and buzzing, lasting 3-5 seconds, then silence.
- 🔥 Symptom: The compressor is hot at touch, but does not start.
- ⚡ Symptom: Complete lack of sound from the motor when the light is on.
In the case of inverter models, the problem may lie in inverter module, which converts the current for the motor. Power surges often damage electronics. Replacing the compressor yourself requires special equipment for evacuation of the system and charging with freon.
Freon leak and capillary tube clogged
If the compressor runs continuously without turning off, but there is no cold, or the freezer is working, but it is warm in the refrigerator compartment, there is a high probability refrigerant leaks. Freon can escape through microcracks in the foamed circuit or through soldering joints of tubes. In the system No Frost this is critical, since cooling a large volume requires a certain gas pressure.
Another similar problem is Clogged capillary tube. Oil and freon circulate in the system. Over time, oil breakdown products or moisture can clog the narrow channel of the capillary. The pressure drops and the compressor wastes gas.
| Symptom | Freon leak | Clogged system |
|---|---|---|
| Operation compressor | Works without stopping | Works with overload or turns off |
| Condenser temperature (rear grille) | Cold or partially warm | Hot before blockage, cold after |
| Sound during puncture | Gas hissing | Lack of hissing or oil leakage |
To eliminate these faults you need to find the leak (often using a leak detector), solder it, evacuate the system and refill new refrigerant. This is work for a professional service center.
⚠️ Attention: An independent attempt to refill the refrigerator “by eye” without evacuation will lead to rapid breakdown of the compressor due to the presence of moisture and air in the system.
Failures in the operation of the electronics and module control
Modern refrigerators LG are stuffed with electronics. Control module (motherboard) receives signals from many sensors and controls all processes. If the board “glitches” or burns out, it may not send a command to turn on the compressor, even if all mechanical parts are working properly.
Often the problem lies in contact oxidation or a power surge. Some models have problems with wiring harnessgoing from the body to the door. Due to the constant opening of the door, the wires are broken, and the signal from the door opening sensor or panel buttons does not pass.
Diagnostics of the board requires knowledge in electronics. Visually you can notice burnt tracks or swollen capacitors. However, often the board looks intact, but does not perform its functions. In such cases, flashing or replacing the module helps.
Hidden signs of board malfunction
The indicators on the panel may blink randomly, the wrong segments will light up, or the refrigerator may spontaneously change operating modes (for example, turn on super freezing without a command).
Mechanical damage and wear seals
It would seem to be a simple problem, but poor fit of the door it can cause the refrigerator to stop freezing. If warm, humid air constantly enters the chamber, the system No Frost cannot remove moisture. The evaporator becomes overgrown with a “fur coat”, ventilation stops, and the temperature rises.
Check sealing rubber along the perimeter of the door. It should be elastic, clean and fit snugly to the body. If the rubber has dried out, cracked or deformed, the cold will evaporate.
- 🚪 Check if the door is warped (often happens when shelves are overloaded).
- 🧹 Clean the seal groove from crumbs and adhered dirt.
- 💡 Do a test with a sheet of paper: hold the sheet with a door and try to pull it out. If it is pulled out too easily in different places, the tightness is broken.
It is also worth paying attention to the door hinges. Over time, they may weaken and the door will begin to come away from the bottom or top. Adjusting the hinges often solves the problem without replacing the rubber.
Diagnostics using error codes
LG refrigerators have a self-diagnosis function. If the device has stopped freezing, the display (or through a combination of indicators, if there is no display) may display error code. This is the fastest way to understand what exactly is broken.
For example, the code rF indicates a problem with defrosting the freezer, and Er FF indicates a malfunction of the freezer fan. The code Er CF indicates problems with the refrigerator fan. Knowing the code, you immediately understand which node to check.
⚠️ Attention: Error codes may vary depending on the specific series and year of manufacture of the LG model. Always check the instructions for your device.
To see the code on models without a display, you often need to hold down two buttons on the control panel at the same time (for example, “Freezer” and “Ice Plus” or “Fridge” and “Freezer”) for a few seconds. The indicators will begin to flash in a certain sequence, the explanation of which must be found in the manual.
☑️ Primary diagnostics
When you need to call a technician
Many users wonder: can Is it possible to fix a refrigerator with your own hands? If we are talking about replacing a light bulb, defrosting or adjusting hinges - yes. But if the problem lies in refrigerant circulation system or complex electronics, the risk of harm is great.
A call to a technician is necessary if:
- 🛠 Replacement of the compressor or soldering of pipes is required (need tool and gas).
- 🔌 There is a suspicion of a phase breakdown on the housing (dangerous to life!).
- 🧊 The system is completely clogged with ice inside the housing (disassembly and stripping are required).
Professional repairs will not only eliminate the malfunction, but will also provide a guarantee for the work performed work. An attempt to save on calling a specialist in the event of a complex breakdown often leads to the purchase of a new refrigerator.
Frequently asked questions (FAQ)
Why does the LG refrigerator hum, but does not freeze?
If there is a hum, then the compressor is trying to work. Possible reasons: a freon leak (there is nothing to cool the gas with), a clogged capillary system, or a malfunction of the starting relay, which prevents the engine from starting fully. It is also possible that the compressor itself fails (an interturn short circuit).
What does a flashing indicator on an LG refrigerator mean?
A flashing indicator usually signals an increase in the temperature in the chamber above normal. If after defrosting and rebooting (disconnecting from the network for 15-20 minutes) the blinking continues, it means that there is a technical malfunction that the system has already recorded as an error.
Is it possible to operate the refrigerator if it is a little under-frozen?
Short-term - yes, but this will lead to spoilage of food and increased load on the a compressor that will work for wear. Long-term operation in this mode will shorten the service life of the unit. It is better to find and eliminate the cause.
How to defrost an LG No Frost refrigerator correctly?
Despite the name of the system, you need to defrost it. Disconnect the device from the mains, open the doors and leave for at least 10-12 hours (preferably for a day). Do not use hair dryers or knives to chip ice inside the chambers - this may damage the evaporator. Let the ice melt naturally.