The situation when your LG refrigerator stops maintaining the desired temperature always takes you by surprise. Products begin to deteriorate, and condensation appears on the shelves or, conversely, an ice crust appears where it should not be. Most often, owners notice a problem when the chamber becomes too warm, and the compressor works almost non-stop, trying to compensate for the lack of cold.
Modern models of the South Korean brand, especially the C series, are equipped with sophisticated electronics that themselves control the temperature regime. However, even smart technology is not immune to failures. If you notice that the equipment is humming more than usual or it has become noticeably warmer inside, you need to promptly carry out diagnostics. No Frost system, are equipped with sophisticated electronics, which themselves control the temperature regime. However, even smart technology is not immune to failures. If you notice that the equipment is buzzing more than usual or it has become noticeably warmer inside, you need to promptly carry out a diagnosis.
In this article we will analyze in detail the mechanical and electrical reasons for the decrease in performance. You will learn how to distinguish a banal thermostat overload from a serious refrigerant leak, and understand when you can handle it yourself, and when you need to call a specialist.
Violation of operating and loading rules
Before you panic and look for breakdowns in the unit components, it is worth eliminating the human factor. Often the reason that LG refrigerator does not freeze well lies in the incorrect arrangement of food. If you have just loaded a large amount of warm food into the chamber or left the door ajar, the system will not have time to quickly restore balance.
Particular attention should be paid to air circulation. In models with Total No Frost cold air is pumped by a fan through special channels. If these holes are clogged with bags or food, the cold simply will not reach the far corners of the chamber. As a result, the sensors record high temperatures and cause the compressor to wear out.
It is also critical to check the temperature settings. Perhaps one of the household members accidentally changed the settings by switching the regulator to “Eco” or minimum cooling mode. To check the current operating standards for your specific model, always check the official instructions, as requirements may vary.
⚠️ Warning: Never place hot pots inside the oven. This creates a colossal load on the compressor and leads to the formation of ice plugs in the moisture removal system.
Check the tightness of the sealing rubber. If warm air from the room enters the door, ice forms inside and the freezing efficiency decreases. A simple test with a sheet of paper will help identify leaks: hold the sheet of paper in the door and try to pull it out. If it comes out too easily, the seal requires replacement or adjustment.
Problems with the No Frost defrosting system
One of the most common reasons why LG refrigerator stops freezing normally is a failure in the automatic defrosting system. In units with No Frost moisture falling on the evaporator freezes and then thaws with a special heater (heating element) according to a timer. If this cycle is disrupted, the evaporator becomes overgrown with a “coat” of ice.
Ice build-up blocks the operation of the fan, and cold air stops flowing into the main chamber. In this case, the evaporator itself may be icy, but the food compartment is warm. Visually, this can be noticed by a decrease in fan noise or its complete absence.
How to defrost a refrigerator manually?
If you suspect icing of the evaporator, the easiest way to diagnose is complete defrosting. Unplug the appliance, open the doors and leave it for at least 24 hours (preferably a day). Do not use a hairdryer or hot water to speed up the process, as this may damage the plastic and tubing. After defrosting, turn on the appliance. If after a few hours the freezer gets cold, then the problem is definitely in the defrosting system.
In the defrosting system, three main elements can fail:
- 🔥 The defrosting heating element - it burns out and stops heating, leaving the ice to freeze.
- 🕰️ Timer or control board —does not give a command to turn on the heating.
- 🌡️ Defrost sensor —incorrectly reads the temperature and blocks the start of defrosting.
To replace these components, partial disassembly of the rear wall of the freezer is often required. If you do not have the skills to work with a multimeter and electrical circuits, it is better to entrust this work to a professional so as not to damage the fragile plastic fasteners.
Faults of the compressor and start relay
The heart of any refrigerator is the compressor. If LG unit it hums, but does not freeze, or turns on for a couple of seconds and immediately clicks and turns off, the problem may be in the start-up relay. This small element is responsible for starting the engine. If it breaks down, the compressor cannot reach the required speed.
A more serious situation is the failure of the motor-compressor itself. This can happen due to inter-turn short circuit of the windings or mechanical wear. Modern models are often installed inverter compressors, which are quieter and more economical, but their diagnosis requires special equipment.
☑️ Compressor diagnostics
Symptoms of a compressor malfunction are often accompanied by strong heating housings. If you reach the back of the vehicle and feel that the engine is hot but not cold, this is a bad sign. Also pay attention to the smell: a burnt smell of insulation indicates an electrical fault.
The table below shows the main symptoms and probable causes of problems with the compressor group:
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Buzzes, but does not start | Start relay or compressor wedge | Average |
| Works constantly, without turning off | Freon leakage or piston wear | High |
| The case gets very hot | Failure of the windings or overload | High |
| Makes a metallic knock | Destruction of the suspension engine | Medium |
| Clicks and turns off | Starting relay burnt out | Low |
Refrigerant leak and capillary blockage system
If you see that LG refrigerator it is working, the compressor is hot, but it’s warm inside, and the freezer is covered with only a partial layer of frost (or does not freeze at all), most likely there is a freon leak. The refrigerant circulates in a closed circuit, and any leakage leads to its gradual disappearance.
Leaks often occur in places where the tubes are sealed, in the foamed part of the body (due to corrosion) or in the evaporator. The second common option is a clogged capillary tube. A plug forms in the system from oil or moisture breakdown products, which blocks the flow of refrigerant.
⚠️ Attention: Freon is odorless and colorless, so it is impossible to detect a leak by smell. To find the location of the damage, the technician uses a special device - a leak detector, or the soaping method.
It is almost impossible to eliminate a leak or blockage on your own. Required:
- 🔍 Find the location of the damage using a leak detector.
- 🔥 Solder the damaged area (a torch and solder are required).
- 💨 Vacuum the system to remove moisture and air.
- ⛽ Fill the system with new refrigerant strictly by weight.
Attempts to simply “add freon” without looking for a leak will only give a temporary effect, since the gas will escape through the hole again. In addition, improper refueling can permanently damage the compressor.
Failures in the operation of electronics and sensors
Modern ones LG refrigerators are stuffed with electronics. Thermal sensors scattered in different zones are responsible for the temperature regime. If one of them starts to “lie” or shows incorrect data, the control board receives a false signal that there is already cold and turns off the compressor.
The sensor located in the freezer compartment or on the air duct often fails. Its resistance changes with temperature, and if it falls outside the permissible range, the system goes into emergency mode. Error codes may light up on the display, for example rF (defrosting error) or dS (sensor error).
To diagnose sensors, use a multimeter in resistance measurement mode (Ohm). Resistance values at different temperatures can be found in the technical manuals for a specific model. If the device readings differ greatly from those in the table, the sensor must be replaced.
In rare cases, the sensor itself is faulty control board. Oxidation of contacts, burnt tracks or failure of compressor control triacs require professional repair or replacement of the entire module.
Influence of external factors and installation
Do not forget that the efficiency of the equipment depends on environmental conditions. If LG refrigerator stands close to the wall, near a heating radiator or in direct sunlight, heat exchange is disrupted. The condenser (black grille on the back or sides) does not have time to cool down, and performance drops.
It is also important to consider the room temperature. Most models are designed to operate in the range from +10°C to +32°C (climate class SN-T). If the room is colder than +10°C, the oil in the compressor thickens and it may not start or quickly break down.
Check the gap between the back of the device and the wall. It should be at least 5-7 cm for free air circulation. Lack of ventilation leads to overheating and reduced equipment life.
Frequently asked questions (FAQ)
Why does the LG refrigerator freeze only at the top or only at the bottom?
This is a classic sign of a refrigerant circulation problem (leakage or blockage) or a system malfunction No Frost. If there is cold only at the evaporator, but does not spread throughout the chamber, check the fan and air supply channels.
What does the flashing temperature indicator on the panel mean?
A flashing indicator usually signals that the temperature in the chamber has risen above the permissible norm. This may be a consequence of loading warm products, but if the blinking does not stop for several hours, it means there is a technical malfunction.
Is it possible to operate the refrigerator if it does not freeze well?
For a short time - it is possible, but not recommended. Long-term operation in this mode (especially if the compressor does not turn off) will lead to overheating and costly repairs. Food can also spoil.
How often do you need to defrost an LG No Frost refrigerator?
Technically, the No Frost system does not require manual defrosting. However, manufacturers recommend carrying out preventive defrosting and washing 1-2 times a year to maintain hygiene and check the condition of the seals.