Modern refrigeration units of the South Korean brand LG are famous for their reliability and advanced technologies, such as a linear inverter compressor. However, even the most advanced equipment can fail over time, requiring immediate intervention by the owner or specialist. Understanding the basic principles of operation of the unit will help you quickly determine the nature of the malfunction and, possibly, fix it yourself, saving significant money on calling a technician.
Before taking active steps, it is necessary to carry out an initial diagnosis and make sure that further manipulations are safe. Any work related to disassembling the housing or checking electrical circuits should be carried out only after disconnecting the device from the power supply. Ignoring safety rules can lead to electric shock or damage to the control electronics.
In this article we will analyze in detail the algorithms for finding and eliminating the most common malfunctions typical for models with the system No Frost and classic drip defrosting. You will learn how to replace a burnt-out heating element, clean the drainage hole, or restore the operation of sensors without resorting to complex special tools.
Primary diagnostics and work safety
Repair of any household appliance should begin with a thorough visual inspection and analysis of symptoms. If your LG refrigerator stops freezing, hums louder than usual or makes strange clicking noises, do not rush to disassemble it completely. Often the problem lies in trivial things, such as lack of voltage in the outlet or incorrect installation of the thermostat. Check that the power indicator on the control panel is on and make sure that the power cord is not damaged.
Particular attention should be paid to the operating conditions. The unit must stand on a flat surface, without touching the back wall of the furniture, to ensure free circulation of air around the condenser. Compressor overheating due to poor ventilation, it often causes an emergency shutdown or failure of the motor. Also check the tightness of the door seals - if the rubber is dirty or deformed, the cold will evaporate, causing the equipment to wear out.
⚠️ Attention: It is strictly forbidden to open the refrigerant circulation system without special equipment and a license. Freon can be hazardous to health, and a violation of the tightness of the circuit will require expensive professional vacuumization and refilling.
To carry out high-quality diagnostics, you may need a minimum set of tools: a multimeter for testing circuits, screwdrivers of various types and, possibly, a hair dryer for defrosting ice. If you notice traces of burning, melted wires, or smell burnt insulation, further use of the device must be stopped. In such cases, it is better to contact a service center, as there may be a malfunction of the control board or motor windings.
The refrigerator does not turn on or does not freeze
The situation when LG does not respond to being turned on or stops maintaining a low temperature is one of the most critical. First of all, check the integrity of the network cable and the presence of voltage in the outlet. If everything is in order with the power supply and the indicators do not light up, there is a high probability of failure control unit or the compressor start relay. The relay is a small plastic block placed on the side fitting of the compressor, which, when burned, emits a characteristic click when trying to start.
In models with a linear inverter compressor, diagnostics are more difficult, since engine starting is controlled by the inverter electronic board. If you hear a hum, but the compressor does not start, or it starts and immediately stalls, the problem may be in the motor itself or in its power supply circuits. Inverter systems are sensitive to voltage surges, so using a stabilizer often extends the life of expensive equipment.
If the compressor is running continuously, but there is no cold, check the tightness of the system. Freon leakage is a common cause of lack of cooling. Oily yellowish stains may appear at leak sites. It is also worth inspecting the evaporator: if it is covered with an uneven layer of frost or is completely clean (with the motor running), this indicates a violation of the refrigerant circulation or a clogged capillary tube.
Signs of a faulty inverter board
The inverter board is usually located at the bottom of the refrigerator. If it malfunctions, the compressor may not start at all or work intermittently. Power switches on the board often burn out or capacitors swell. Independent board repair is possible only if you have deep knowledge of radio electronics and soldering equipment.
It is important to distinguish between the lack of cold in one chamber and in the entire unit. If only the upper or lower chamber does not freeze, and the compressor is humming, most likely the problem is in the defrost system or air flow distribution, and not in the compressor.
Problems with the No Frost defrost system
Refrigerators LG No Frost equipped with an automatic defrost system that prevents the formation of ice fur coats on the evaporator. If you find ice freezing in the refrigerator or freezer, as well as on the back wall, then the defrost cycle is broken. The main elements of this system are defrost heating element, a defrost sensor (thermostat) and a timer (or electronic control module). Most often, the heating element itself burns out or the sensor gets stuck.
To replace the heating element, you will need to remove the back panel in the freezer. Before doing this, be sure to completely defrost the unit for 10-12 hours so that the ice does not damage the plastic parts and allows you to carefully get to the components. After defrosting, remove the panel, find the heating element (usually a curved tube or glass bulb under the evaporator) and test it with a multimeter. The resistance of a working heating element is usually from 200 to 400 Ohms.
A defrost sensor (defroster) is a small part that controls the temperature of the evaporator. If he “lies” and shows that there is no ice when there is, the heating element will not turn on. The sensor is also checked with a multimeter in resistance measurement mode. At room temperature, it should have high resistance or be open (depending on the model), and when cooled, it should close the circuit.
☑️ Replacing the defrost heating element
Do not forget to check the drainage hole through which melt water flows into the tray above the compressor. If it is clogged with debris or ice, water will begin to pool at the bottom of the chamber and leak out. You can clean the channel using a soft wire or a special brush, pouring warm water.
Fan and thermostat malfunctions
In the system No Frost the circulation of cold air is provided by a fan. If it stops working, no cold will enter the chambers, although the evaporator may be frozen. Signs of a fan malfunction are the absence of the characteristic airflow noise when the door is open (in some models the fan stops when opened) or, conversely, the appearance of a strong hum and crackling sound. Jagging of the blades Ice or bearing wear are the main causes of failure.
Replacing the fan usually does not cause difficulties: it It is attached with several screws to the evaporator body or partition. The main thing is to connect the connector correctly and make sure that the blades rotate freely. Before installing a new unit, it is recommended to lubricate the axle with a drop of machine oil, if the design allows it, although modern models are often supplied with maintenance-free bearings.
In models with a drip system and two-chamber units, a thermostat (or electronic temperature sensor) plays an important role. It is he who gives the command to the compressor to turn on or off. If the refrigerator does not “see” the temperature increase, it will not start. If it does not turn off when the specified parameters are reached, the food will freeze and ice will appear on the walls. The mechanical thermostat is adjusted through a special screw on the rod, but it is better not to twist it unnecessarily, but to replace the sensor if there is an obvious malfunction.
⚠️ Attention: When replacing the fan, make sure that its direction of rotation matches the original. Reversing the motor will lead to a lack of air circulation and overheating of the windings.
Diagnostics of the thermostat requires removing it and testing it in different temperature conditions (for example, placing it in the refrigerator or heating it in your hands). Electronic sensors (thermistors) are checked by measuring resistance, which should change smoothly with temperature changes.
Replacing seals and eliminating noise
Extraneous noise during operation of the refrigerator LG can be caused by various reasons. If the humming noise changes to a metallic clanging or knocking sound, the compressor or its shock-absorbing springs may have failed. If the sound resembles friction or whistling, check the fan - often the blades touch frozen ice or wiring. Vibration of the case often occurs due to improper installation: adjust the front support legs so that the refrigerator is stable and has a slight tilt back for the doors to close themselves.
The rubber door seal loses its elasticity over time, cracks and no longer fits tightly. This leads not only to loss of cold, but also to the formation of condensation and ice. You can replace the seal yourself: new cuffs for LG are sold at service centers. The old seal is carefully removed from the groove, the new one is installed around the perimeter, starting from the corners.
For a better fit, the new seal can be heated with a hair dryer (without overheating!) or use boiling water to make the rubber softer. After installation, the door should be closed and, if possible, pressed with a weight for several hours so that the seal takes the shape of the opening.
Regular cleaning of the seal with a damp cloth and a mild detergent will help preserve its properties and prevent the appearance of mold in the folds of rubber.
Table of error codes and their interpretation
Modern refrigerators LG equipped with a self-diagnosis system that displays error codes on the display. Understanding these codes makes troubleshooting much easier. Below is a table of the most common errors.
| Error code | Description of the malfunction | Possible cause | Recommended action |
|---|---|---|---|
r or dH |
Defrost error | Faulty heating element, defrost sensor or timer | Check the defrost circuit, replace the heating element or sensor |
F or FF |
Fan error | Fan jammed, open circuit | Check the free movement of the blades, ring the motor |
Er IF |
Ice maker error | Ice maker sensor malfunction | Check connection and operation ice maker |
Er SF |
Sublimation fan error | Problem with freezer fan | Replacing the fan or checking the wiring |
Er FF |
Freezer error | Temperature sensor malfunction | Replacing the freezer temperature sensor |
If an error code appears, try rebooting the refrigerator by unplugging it for 10-15 minutes. If the error recurs, detailed diagnostics of the specified node is required. Ignoring codes can lead to more serious damage, for example, compressor combustion due to abnormal operation.
Frequently asked questions (FAQ)
Why does the LG refrigerator hum immediately after turning on?
Humming in the first minutes of operation is a normal process for the compressor to enter operating mode, especially in models with a linear inverter. However, if the hum turns into vibration or lasts constantly, check the distance to the wall and the stability of the legs.
How often do you need to defrost a No Frost refrigerator?
The system No Frost does not require regular manual defrosting to remove ice. However, experts recommend completely defrosting and washing the unit 1-2 times a year for hygiene and prevention of the drainage system.
Is it possible to replace the compressor on an LG yourself?
Theoretically, it is possible, but this requires special tools (burner, vacuum pump, pressure gauges) and skills in working with refrigerants. Without sealing and vacuuming, the system will quickly fail. It is better to entrust this to professionals.
What to do if there is water in the refrigerator compartment?
Most likely, the drainage hole is clogged. Find it on the back wall inside the chamber, clean it with a soft wire or brush and spill with warm water. Also check whether the products are placed too close to the back wall.
How long does the LG linear compressor last?
The manufacturer claims a service life of up to 20 years due to the reduced number of rubbing parts. In practice, with proper operation and stable voltage, they run for 10-15 years without problems.