The sudden discovery that your LG refrigerator has stopped cooling food always becomes an unpleasant surprise that requires immediate intervention. The chamber may be warm, there may be no frost on the walls, or, conversely, the food begins to freeze, although the regulator is set to minimum. Understanding the nature of the malfunction is the first and most important step to restoring the functionality of household appliances.
Modern units of the brand LG equipped with complex control systems, such as Linear Inverter, which provide energy efficiency, but are also sensitive to voltage drops and mechanical damage. Often, users panic ahead of time without checking basic things, such as the tightness of the door or the position of the temperature regulator. However, in some cases, the problem lies deeper and requires professional diagnostics or replacement of components.
In this article we will analyze in detail the main failure scenarios, from simple operating errors to complex technical malfunctions of the compressor and defrost system. You will learn to distinguish between symptoms that can be eliminated yourself and signs that require calling a specialist. It is critically important not to ignore the hum of a running engine in the absence of cold for more than 4-6 hoursas this can lead to damage to a large volume of products and complicate repairs.
Primary diagnosis: checking simple reasons
Before sounding the alarm and looking for service center contacts, it is necessary to eliminate commonplace errors. It often happens that the equipment is fully operational, but does not work correctly due to external factors. Carefully inspect the interior of the chamber and make sure that the products do not block the ventilation holes.
Check the tightness of the sealing rubber around the perimeter of the door. If a foreign object gets into the gap or the rubber is deformed, cold air will escape, and the compressor will work for wear, trying to compensate for heat loss. Also make sure that the temperature regulator has not been accidentally knocked down by children or during cleaning.
- 🔍 Check that the unit is not standing too close to the wall or heating devices, which interferes with air circulation.
- 🌡️ Make sure that there are not too many warm products loaded inside the chamber at the same time.
- 🚪 Inspect door hinges for distortions that prevent them from closing tightly.
If you notice that the light inside is on, but no cold is generated, listen to the sounds of the motor running. In models with the system No Frost the absence of characteristic fan noise may indicate that it is blocked by ice or failure.
⚠️ Attention: If you place the refrigerator in an unheated room (balcony, garage) at a temperature below +5°C or above +32°C, the compressor may not start due to the properties of the refrigerant and oil viscosity.
Malfunctions of the defrost system in No Frost models
One of the most common reasons why LG refrigerator it freezes poorly or stops cooling altogether is a failure in the automatic defrost system. In units with technology No Frost moisture from the products is removed outside the chamber and freezes on the evaporator, which is hidden behind the back wall. Periodically, this ice must thaw.
If one of the elements of the defrost circuit fails, the evaporator becomes overgrown with a “coat” of ice. This ice shell blocks the operation of the fan and blocks the cold air supply channels into the chamber. As a result, the compressor works continuously, but the cold simply does not reach the food.
Diagnostics often require partial disassembly of the rear wall of the freezer. A visual inspection will reveal the presence of ice build-up. The main culprits are usually:
- ❄️ defrost heating element, which burns out and stops heating the evaporator.
- 🕰️ Defrost timer or electronic control module that does not send a signal for heating.
- 🌡️ Sensor defrost, which erroneously reads the temperature and interrupts the heating cycle ahead of time.
In some cases, completely defrosting the unit during the day with the doors open helps. If after turning on the cold appeared, but after a week or two the situation repeated itself, it means that the faulty part needs to be replaced.
Problems with the compressor and start relay
The heart of any refrigerator is the compressor. In technology LG inverter models are often used, which are characterized by quiet operation and smooth start-up. If you hear the motor trying to start, making a clicking or humming sound, but immediately stopping, the problem may lie with the start relay or the compressor itself.
The start relay is a small plastic block attached to the motor housing. It is responsible for supplying the starting impulse. Over time, the contacts inside the relay oxidize or burn out, making it impossible to start the engine. Replacing this part is relatively simple and inexpensive.
A more serious situation occurs when the compressor windings are shorted between turns or are mechanically jammed. In this case, the motor may hum, heat up, but not rotate. Inverter compressors Linear Inverter with such problems often display an error on the display or go into protective mode.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Click and silence | Faulty start relay | Replacing the relay |
| Humming and heating of the case | Stuck compressor | Replacing the compressor |
| No response to switching on | Open circuit or module | Electrical diagnostics |
⚠️ Attention: Replacing the compressor yourself requires special equipment for vacuuming the system and charging with freon. Without the skills of soldering and working with refrigerant, it is dangerous to undertake this procedure.
Leakage of refrigerant (freon)
If the motor runs almost non-stop, trying to gain temperature, but the chambers are warm, and the evaporator (the back wall inside the freezer) remains warm or is only partially covered with frost, there is a high probability of a leak. refrigerant. Freon circulates in a closed circuit, and if the seal is broken, the cooling efficiency drops to zero.
Leaks in refrigerators LG often occur in places where tubes are soldered, in the foamed part of the body (evaporator) or in the heating circuit around the door perimeter. It is almost impossible to visually detect the location of a leak without special equipment (leak detector), since freon is colorless and odorless.
Indirect signs of a leak are:
- 💨 Blistering of the wall inside the freezer (when leaking from a foamed evaporator).
- 📉 Long-term operation of the compressor without reaching the set temperature.
- 💧 The appearance of oily spots under the unit (freon comes out along with the oil).
Repair in the event of a leak from the foamed part of the housing is often not economically feasible, since it requires the installation of an external (“crying”) evaporator and a complex restoration. If the visible tube is damaged, the technician can solder the hole and refuel the system.
Problems of the thermostat and temperature sensors
The thermostat (thermostat) in mechanical models or a set of sensors in electronic control is responsible for maintaining the set temperature. If this element “lies,” the refrigerator may not turn on at all or work without interruption, causing food to freeze.
In models LG with electronic control, the main module, which receives data from sensors, is responsible for all processes. Failure of the temperature sensor in the refrigerator compartment can lead to the fact that the “brain” of the refrigerator will consider that there is already cold and will not give the command to start the compressor.
To check a mechanical thermostat, it is often excluded from the circuit by closing the contacts directly. If the compressor starts, the thermostat is at fault. In electronic systems, diagnostics are carried out by measuring the resistance of sensors at different temperatures and comparing the readings with a table of ratings.
Users often encounter a situation where, after replacing a seal or loading products incorrectly, the sensor reads the wrong temperature. Problems can also arise when contacts in the wiring connectors from the door to the body oxidize.
Clogged capillary system
The capillary tube is the thinnest channel through which refrigerant under high pressure enters the evaporator. Over time, oil oxidation products or moisture can accumulate in the system, which turn into an ice plug or mud mass, blocking the freon flow.
Symptoms of a blockage are very similar to a leak: the compressor works, but there is no cold. However, when clogged, you can often hear gurgling or hissing sounds in the area of the filter drier. To the touch, the filter may be cold or covered with frost, which is not typical for its normal operation.
To eliminate this malfunction you need:
1. Purge the system with nitrogen under high pressure.
2. Replacing the filter-drier, which adsorbs moisture.
3. Evacuation and new charging with refrigerant.
⚠️ Attention: The use of artisanal cleaning methods or the addition of “antifreeze” to the system is strictly prohibited. This will lead to a chemical reaction with the compressor oil and its rapid destruction.
☑️ Actions before the technician arrives
Frequently asked questions and answers (FAQ)
Why does the LG refrigerator buzz loudly after defrosting?
A hum after defrosting can be caused by the fact that the ice plug in the drainage system has melted and hit the hot parts of the compressor, causing steam. It is also possible that the fan was installed incorrectly during assembly and is touching ice or wires. If the noise does not subside after an hour of operation, check the fastenings.
Is it possible to operate the refrigerator if it does not freeze, but the light is on?
Long-term operation in this mode is dangerous for the compressor, since it runs idle or in overload mode without sufficient oil cooling. This can lead to costly repairs. It is better to turn off the device until the reasons are determined.
What does the flashing indicator on the LG control panel mean?
Flashing indicators usually indicate a specific error. For example, a flashing freezer light could indicate a faulty sensor or a problem with the fan. The exact decoding of the error code (for example, Er FF, Er CF) can be found in the instructions for your model.
How often do you need to defrost a No Frost refrigerator?
Technically, the system No Frost does not require regular defrosting to remove ice, as it does it automatically. However, manufacturers recommend carrying out preventive defrosting and washing 1-2 times a year for hygiene and checking the operation of the drainage hole.
Why is the back wall of the refrigerator compartment covered with ice?
In systems No Frost the back wall should not be cold, cold is supplied through the channels. Ice on the back wall of the refrigerator compartment often indicates that the drainage hole is clogged, and the water from the condensation does not drain away, but freezes. This may also be a sign of the door not closing tightly.