The situation when your LG refrigerator suddenly stops freezing always takes you by surprise. Products begin to deteriorate, an unpleasant odor appears, and condensation forms on the shelves. The owner immediately asks the question about the causes of the failure: is it a temporary power surge, an electronics error, or a serious breakdown of the unit?
In most cases, the problem lies in the malfunction of one of the key components of the cooling system. Two-compressor and single-compressor models may behave differently, but the diagnostic logic often remains similar. Do not panic if you find that the chamber is warm - perhaps it is a simple fan blockage or a stuck sensor.
Before calling a technician, it is necessary to conduct an initial visual inspection and exclude trivial causes. The most common mistake is trying to turn the device on again immediately after turning it off, which can burn the compressor. Let the equipment cool down and only then check the basic operating parameters.
Primary diagnostics and power check
The first thing to do if the LG refrigerator does not freeze is - make sure there is power supply. Sometimes the problem is trivial: the cord has come loose, the plugs in the panel have been knocked out, or the socket has burned out. Check if the indicator on the control panel is lit. If the display is inactive, the problem is clearly in the electrical circuit, and not in the cooling system.
Pay attention to the operation of the compressor. If it hums, but there is no cold, or is silent at all, these are two different scenarios. In the first case, the starting protection mechanism may be faulty, in the second there is a problem with the electronic module or the motor itself. Electronics Modern LG models are sensitive to voltage drops.
- 🔌 Check the tightness of the connection of the plug to the socket and the integrity of the cable.
- 💡 Verify that the front panel indicators respond when the door is opened.
- ⚡ Try plugging the appliance into another outlet that is known to work properly.
⚠️ Warning: If you hear a clicking or buzzing sound that lasts a few seconds, followed by silence and a repeat click, do not attempt to start the refrigerator many times. This is a sign of a faulty start relay or compressor.
It is also important to listen to the sounds of operation. Normal cooling cycle is accompanied by a quiet hum and periodic rumbling of the refrigerant. If there is absolute silence or, conversely, a loud knock, this is a signal of a mechanical or electrical malfunction.
No Frost system errors and problems with defrosting
Technology No Frostused in most LG models implies the absence of ice in cameras. However, if the defrosting system fails, the evaporator becomes covered with a “fur coat” that blocks air circulation. As a result, the fan cannot drive cold air into the chamber, and the food begins to deteriorate.
Often the cause is burnout Defrost heating element or failure of the evaporator temperature sensor. The electronic module “thinks” that the evaporator is cold and does not turn on the heating element to defrost the ice. Ice accumulates, blocking the air duct channels.
☑️ Diagnostics of the No Frost system
To check, you need to remove the back panel in the freezer. If you find a massive layer of ice or snow on the radiator, the problem is in the defrost system. In this case, the refrigerator can work for days, but there will be no cold in the main chamber.
⚠️ Attention: When defrosting ice, it is strictly forbidden to use sharp objects or a hair dryer at maximum power. This can damage the plastic ducts or burn the evaporator.
It is also worth checking the drainage hole. If it is clogged with debris or frozen, the water from the melting ice does not leave, but accumulates below and freezes, creating an ice plug. This disrupts the operation of the entire air circulation system.
Faults in the compressor and start relay
Compressor are the heart of the refrigerator. If it does not start, the refrigerant does not circulate through the system and cooling is not possible. LG refrigerators often use inverter compressors, which are quiet, but require complex diagnostics.
A common cause of failure is the start relay. This is a small device that provides an impulse to start the motor. If the relay is stuck or burnt out, the compressor will either be silent or hum for a few seconds and turn off. Replacing the relay is a simple procedure and can often be solved with your own hands.
| Symptom | Possible cause | Solution |
|---|---|---|
| Buzzing for 5-10 seconds, then clicking and silence | Faulty starting relay | Replacing the relay |
| The compressor is hot, but does not start | Interturn winding short circuit | Replacing the compressor |
| Silence, no response to switching on | Open circuit or control module | Electrical diagnostics |
| Buzzes constantly without turning off | Freon leak or wear | Searching for leaks, refueling |
If the compressor runs constantly without turning off, but the temperature in the chamber does not drop below +10°C, this may indicate a loss of performance. The piston group could be worn out, and the motor simply does not create the necessary pressure for compression cycle.
What is an inverter compressor?
The inverter compressor in LG refrigerators does not operate at full power all the time, but smoothly regulates the speed. This saves energy and reduces noise. However, its repair requires special equipment and qualifications, since the control board is built into the motor itself.
Refrigerant leakage and system blockage
Refrigerant (freon) is a working fluid that transfers heat. If a microcrack has formed in the circuit, the gas gradually evaporates. At first, the refrigerator begins to freeze worse, then it stops turning off, trying to gain temperature, and eventually stops cooling completely.
Leakage often occurs in places where the tubes are soldered or in the foamed part of the case (evaporator). Finding the leak on your own is difficult, as it requires special equipment. Signs may also be swelling on the side walls or rust on the tubes at the back.
Another problem is capillary blockage. A piece of oxide or technical oil may get stuck in a narrow capillary tube. This blocks the freon flow. The pressure at the inlet to the compressor drops, and at the outlet it increases, but there is no cold.
- ❄️ The condenser (grid at the back) remains cold or warm only at the inlet.
- 🔊 The compressor operates with overload or turns off thermal relay.
- 💧 There is no frost on the evaporator in the chamber, although the compressor is humming.
To eliminate these malfunctions, you need to call a technician. It is necessary to find the leak, solder it, evacuate the system and fill with new freon strictly by weight. Self-refueling “by eye” will lead to breakdown of the compressor.
Problems with the electronic control module
Modern LG refrigerators are controlled by complex electronics. Main control module receives signals from temperature sensors and controls the compressor, fans and heating elements. If capacitors or tracks burn out on the board, commands simply do not reach the execution mechanisms.
Often the module suffers from power surges or moisture. Symptoms may include erratic blinking of lights, display of error codes, or complete lack of response to buttons. Sometimes a reboot helps, but more often a repair or replacement of the board is required.
⚠️ Attention: Before any work with electronics, be sure to unplug the refrigerator for at least 15 minutes. This will allow the capacitors to discharge and reset the controller errors.
It is also worth checking the temperature sensors. If the sensor “lies” and shows the module that the chamber is -30°C, although it is +20°C, the compressor will not turn on. Diagnostics is carried out with a multimeter by measuring the resistance of the sensor at different temperatures.
Mechanical damage and wear of seals
Sometimes the cause of heat in the chamber is trivial - a door that is not tightly closed. Sealing rubber over time it dries out, cracks or deformed. Warm air enters the chamber through the cracks, and the refrigerator simply does not have time to cool it, working non-stop.
You can check the tightness in a simple way: clamp a sheet of paper between the door and the body in different places. If the sheet is pulled out without effort, it means the fit is broken. Also pay attention to door distortions due to excess food.
Mechanical damage may also occur inside: broken air duct dampers. In models with the system Multi Air Flow dampers regulate the flow of cold air. If the mechanism is stuck in the closed position, the cold will not flow into the main chamber.
Frequently asked questions (FAQ)
Why LG refrigerator freezes, but does not turn off?
This may indicate a freon leak, compressor wear, or a chamber seal failure. The reason may also be a faulty temperature sensor, which sends an incorrect signal to the control module.
What does the flashing indicator on the LG panel mean?
A flashing indicator usually signals that the temperature in the chamber is above normal. If, after defrosting and checking the power supply, the indicator continues to blink, then there is a technical malfunction that requires diagnostics of error codes.
Is it possible to operate the refrigerator if it is noisy?
Short-term noise during startup is normal. But if the humming becomes loud, knocking or vibration appears, it is better to stop using it. This can lead to destruction of the compressor suspension or pipelines.
How often do you need to defrost a No Frost refrigerator?
Technically, the No Frost system does not require manual defrosting. However, manufacturers recommend that once a year (or if a smell appears) you completely defrost the device, wash and dry it for hygiene and to prevent drainage blockages.