The situation when your LG refrigerator suddenly stops cooling food always takes you by surprise. It may be warm inside the chamber, the compressor is silent or, conversely, hums without interruption, and the food on the shelves is already beginning to spoil. This is a common problem faced by owners of equipment both with Direct Cooland with the system No Frost.
Before calling a technician, it is important to carry out an initial diagnosis yourself. Often the reason lies in trivial things: improper installation, an electronics failure, or a clogged drainage system. However, if the problem is a freon leak or a compressor failure, serious intervention will be required.
In this article we will analyze in detail all the possible reasons for the lack of cold in LG units. You will learn how to distinguish a minor malfunction from a critical breakdown, and you will understand when DIY repairs are possible and when you need to call a specialist.
Checking settings and temperature conditions
The most common and easily fixable reason for a “warm” refrigerator is incorrect settings. Perhaps one of the household members accidentally touched the control panel or you changed the modes while cleaning. In LG models with electronic control, a failure could occur due to a power surge.
Check the indicators on the display. If the icon Super Freeze or a similar quick freeze indicator is on, the system may have gone into emergency mode or not worked correctly. Also make sure that the "Vacation" or "Eco" mode is not activated, which can change the standard operating algorithm.
- 🔍 Make sure that the temperature in the main chamber is set in the range
+3...+5°C, and in the freezer-18°C. - 🔍 Check if the fast freeze mode is turned on, which sometimes blocks the normal cycle defrost.
- 🔍 Reset the settings to factory settings if the control panel responds to commands.
⚠️ Attention: If after resetting the settings the LG refrigerator started working, but after a few hours it stopped cooling again, the problem lies deeper - probably in the sensors or actuators.
Do not forget that in modern models with Smart Diagnosis the error may be hidden in the software. Try to completely turn off the power to the unit for 15-20 minutes. This action will reboot the controller, which often helps eliminate software glitches.
Problems with the No Frost system and ventilation
In LG refrigerators equipped with the system No Frost, cold air is forced to circulate using a fan. If this unit fails or its blades are blocked by ice, the cold simply does not enter the main chamber, remaining in the freezer compartment.
Often the cause is a malfunction of the defrost heater or thermostat. When the evaporator becomes overgrown with a “fur coat,” the air channel is blocked. This can be seen visually if you remove the back panel in the freezer: you will see a lump of ice interfering with the operation of the fan.
It is also worth checking the condition of the air ducts. They should not contain foreign objects or products that could block the air flow. Sometimes even a small piece of packaging that gets into the fan can stop the entire cooling system.
- ❄️ Listen: if the fan hums but does not spin, the bearings may be jammed.
- ❄️ The absence of a sound from the fan when the compressor is on is a sure sign of its failure.
- ❄️ Check the air recirculation damper: it should open and close at the command of the electronics.
Diagnostics often require disassembling the inside of the freezer. Be careful with the plastic latches of the panels, LG’s ones are quite fragile in the cold.
Faults of the compressor and start relay
The heart of your refrigerator is compressor. If it doesn't start, there won't be any cold anywhere. Older LG models have conventional piston motors, while new ones have inverter motors. The nature of their operation and diagnostics is significantly different.
A conventional compressor should operate cyclically: turn on, work, turn off. If you hear a clicking sound, a buzzing sound, and then silence, the start relay is most likely faulty or the motor itself is jammed. An inverter compressor operates quieter and without sudden starts, so its breakdown is more difficult to notice by ear.
| Symptom | Possible cause | Action |
|---|---|---|
| The compressor is hot, but silent | Thermal protection relay | Wait for cooling, check the wiring |
| Clicking and buzzing is heard | Faulty starting relay | Replacing the relay |
| Motor buzzes, but does not start | Compressor jammed | Repair or replacement required |
| Error indicator on display | Inverter electronics failure | Board diagnostics control |
Features of LG inverter compressors
Inverter motors in LG refrigerators are controlled by complex electronics. They do not turn off completely, but only slow down. If such a compressor constantly hums at maximum speed and does not cool, this is a sign of loss of performance or a refrigerant leak, and not necessarily a breakdown of the motor itself.
If the compressor is running but does not create pressure in the system, this may indicate a loss of compression. In this case, even with working electrics, the refrigerator will not heat.
Refrigerant leak and capillary tube clogged
One of the most unpleasant situations is a freon leak. The refrigerant circulates in a closed circuit, and if a microcrack has formed somewhere (often in the foamed part of the housing or in the evaporator), the gas gradually evaporates. Without freon, heat is not removed from the chambers.
Another common problem is clogged capillary tube. An ice or dirt plug may have formed in the system, blocking the movement of refrigerant. As a result, the pressure in the system drops and cooling stops.
⚠️ Attention: It is impossible to independently find the leak or clean the capillary without a vacuum pump and pressure gauges. These works require a license and special equipment.
Signs of a leak are often a hot condenser (grid at the back) only partially or, conversely, cold, as well as the absence of the characteristic gurgling of freon during operation. If you notice an oily spot under the refrigerator or on the pipes at the back, this is a clear signal of depressurization.
The blockage is often accompanied by unusual behavior of the compressor: it may work longer than usual, trying to gain temperature, or shut down due to overload. Only a technician will make an accurate diagnosis after opening the system.
Failure in the operation of electronics and sensors
Modern LG refrigerators are crammed with electronics. Not only mechanical parts are responsible for cooling, but also temperature sensors, control modules, and solenoids. The failure of one small sensor can lead to the fact that the “brain” of the refrigerator stops giving the command to cool.
Error codes may light up on the display. For example, series codes Er FF indicate problems with the fan, and Er CF indicate a communication fault with the compressor. These signals cannot be ignored.
- 🔌 Check the integrity of the wires going to the sensors (often they fray at the doors).
- 🔌 Oxidation of the contacts on the control board can cause false temperature readings.
- 🔌 Voltage surges could damage the triacs that control load.
Sometimes the problem lies in the control board itself. If traces of burning or swollen capacitors are visible on it, you will need to resolder the elements or replace the entire module.
☑️ Electronics diagnostics
External factors and proper operation
The cause of a breakdown does not always lie inside the unit. Sometimes the LG refrigerator does not cool due to improper operating conditions. For example, if the equipment is installed close to the wall, the rear grille does not have time to release heat, and the operating efficiency drops.
The temperature in the room also affects. If you place the refrigerator in an unheated garage or on a balcony in winter, the oil in the compressor may thicken and it will not be able to start. In summer, at temperatures above +35°C, the system may not cope with the heat inflow.
It is important to monitor the tightness of the rubber seals on the doors. If the rubber has dried out or become dirty, the cold will evaporate, and the compressor will work for wear, trying to compensate for the losses.
When you need to call a technician
Independent repair is possible by replacing a light bulb, defrosting or cleaning the drainage. But there are cases when you cannot do without a professional. If you have checked all the simple reasons, and the refrigerator still does not freeze, it’s time to call service.
This is especially true for work related to refrigerant. Freon is a chemically active substance that requires proper disposal and precise dosage when refilling. Unprofessional soldering of pipes can lead to complete failure of the unit.
A master is also needed if a compressor replacement or complex system re-soldering is required. In these cases, it is necessary to vacuum the circuit, which is extremely difficult to do at home.
How much does it cost to repair an LG refrigerator?
The cost depends on the breakdown. Diagnostics are usually paid if you refuse repairs. Replacing a sensor or fan will cost less than repairing a compressor or refilling with freon. The technician will tell you the exact price after inspection.
Is it possible to use a refrigerator if it does not freeze well?
For a short time - yes, but the food may spoil. Long-term operation in emergency mode (for example, if there is a freon leak) leads to overheating and combustion of the compressor, which makes repairs economically unfeasible.
Why does the refrigerator take a long time to get cold after defrosting?
If you have completely defrosted the unit, the compressor may take from 4 to 8 hours to reach operating mode. Do not load the camera with food immediately, let the equipment run idle.
What to do if the error indicator is on?
Write down the error code (for example, Er SF, Er FF). Try rebooting the refrigerator. If the error returns, this is a direct signal about the malfunction of a specific unit that needs to be changed.