Modern refrigeration units of the South Korean company LG are deservedly considered one of the most reliable on the household appliances market, however, even the highest quality equipment requires intervention over time.
If your unit has stopped freezing, started making strange sounds, or an error code appears on the display, do not panic.
In most cases, the malfunctions that owners encounter can be fixed on their own, having a minimum set of tools and a clear understanding of the structure of the components.
Before disassembling the unit, it is necessary to conduct a thorough diagnosis in order to accurately determine the source of the problem and not replace a working part.
Primary diagnostics and preparation for repair
Any repair begins with a visual inspection and checking the basic parameters of the electrical network.
Make sure that the plug fits tightly into the socket and that the voltage in the network is normal, since surges often damage electronic control boards.
Inspect the back wall of the unit: if you notice blackening, traces of burning or melted plastic, this is indicates overheating of the wiring or failure of the compressor.
Check whether the power indicator on the front panel is lit.
If the light does not light up when plugged in, the problem may lie in a broken power cord or a faulty internal wiring.
In models with a display, pay attention to the error codes generated by the self-diagnosis system.
⚠️ Attention: Before starting any disassembly work, be sure to disconnect the device from the power supply! Working with live electrical components is deadly.
To carry out high-quality diagnostics, you will need a multimeter for testing circuits and various types of screwdrivers.
It will also be a good idea to prepare a flashlight, since the lighting in niches and behind panels is often insufficient.
Write down the model of your device indicated on the nameplate so that when searching for spare parts you won’t be mistaken about the compatibility of the parts.
Common malfunctions of the No Frost system
The system No Frost (or Total No Frost) greatly simplifies operation, eliminating the need for manual defrosting, but adds components that can break.
The most common problem in such models is the freezing of ice on the evaporator, which is located behind the rear wall of the freezer.
When the ice coat becomes too thick, it blocks the cold air supply channels to the refrigerator compartment.
As a result, the temperature in the main chamber rises, food spoils, and it may be too cold in the freezer.
The cause of ice formation is most often the failure of Defrost heating element, timer or defrost sensor.
To test this hypothesis, you need to remove the back panel in the freezer and visually assess the amount of ice on the radiator.
- 🧊 If the radiator is completely covered with ice and the fan does not spin due to ice, the defrosting system does not work.
- 🔥 Checking the heating element with a multimeter should show a resistance in the range of 200-300 Ohms; if the device shows an open circuit, the heater has burned out.
- 💧 The defrost sensor should “ring” at room temperature and open the circuit when cooling (or vice versa, depending on the type).
- 🌀 The fan can also become jammed with ice, which will lead to noise and lack of air circulation.
Replacing a defrosting heating element is a simple procedure, but it requires care when removing plastic fasteners, which become brittle in the cold.
It is also recommended to check the drainage hole through which water drains from melted ice.
If it is clogged with debris or ice, water will accumulate at the bottom of the chamber and leak out.
How to defrost a refrigerator to check?
If you suspect a problem with the No Frost system, the easiest way to diagnose is to completely defrost the unit with the unit turned off for 24 hours. If after turning it on it worked normally, but a week later the problem recurred, it means that one of the elements of the defrost system (heating element, sensor or timer) is faulty.
Problems with the compressor and start relay
The heart of any refrigerator is compressor, and if it fails, repairs often become economical impractical.
However, before putting an end to the unit, it is worth checking the starting relay and the protective thermal relay, which are mounted on the side of the motor.
The symptoms of a malfunction in this unit are typical: the compressor hums for several seconds, then a click is heard, and it goes silent, after which the cycle repeats.
This behavior indicates that the motor is trying to start, but the starting winding does not receive a pulse or is jammed.
Remove the plastic casing at the back of the unit and get to the compressor to remove the relay.
Shake the relay near your ear: if inside rattles like a rattle, which means the contacts are burnt or destroyed, and the part requires replacement.
Replacing a relay is a cheap and quick repair that often brings the equipment back to life.
If after replacing the relay the situation has not changed, and the compressor remains cold and does not start, the motor winding may have burned out or a water hammer has occurred.
In the case of inverter models LG Linear Inverter diagnosis is more difficult, since engine starting is controlled by an electronic unit.
| Symptom | Possible cause | Check method |
|---|---|---|
| Buzzes and clicks, does not start | Faulty starting relay | Visual inspection, continuity of contacts |
| Silent, no light | Open power circuit | Checking the cord and socket with a multimeter |
| Humming constantly, not freezing | Freon leakage | Checking pressure, looking for oil stains |
| Getting very hot | Compressor malfunction | Tactile test, current measurement |
Faults in the electronics and control module
Modern refrigerators LG are crammed with electronics that control all processes.
The main control module (board) is usually located at the top of the unit or in a special compartment at the back.
If the display is not lit, but only the network indicator is lit, or the screen appears chaotic symbols, the problem may be in the board.
Often causes of electronic failure are power surges or moisture ingress.
When inspecting the board, pay attention to swollen capacitors, blackened traces or traces of corrosion.
Sometimes it is enough to replace a burnt fuse or re-solder the capacitor to restore functionality.
However, if you do not have the skills to solder and read electrical circuits, it is better to replace the entire module or contact a specialist.
It is also worth checking the wires going to the door: due to constant opening, they often break at the bend.
This may cause the light in the chamber to not turn on or the display on the door to not work.
⚠️ Warning: Electronic components are sensitive to static electricity. Before touching the board, it is recommended to remove the static charge by touching a grounded metal object.
☑️ Electronics diagnostics
Elimination of noise and vibration
Sometimes the equipment works properly, but irritates the owners with loud humming or vibration.
First of all, make sure that the refrigerator is level.
Adjusting the support legs allows you to compensate for uneven floors and reduce the level noise.
Check whether the condenser pipes or the unit body itself are touching walls or furniture.
Vibration is transmitted very well, and even a small gap of 2-3 centimeters can work wonders.
If the humming comes from inside, the fan may be making noise.
In systems No Frost the fan may hum due to wear of the bearings or ice getting on the blades.
Disassembling the fan and lubricating it (if the design allows) or replacement will help solve the problem.
Also the source of the sound can be the compressor itself, if it old and has exhausted its service life.
- 🔊 A loud hum often indicates that the compressor is operating at its limit.
- 🥁 Knocking or rattling can be caused by loose parts inside the housing.
- 💨 A whistling sound is usually produced by air passing through narrow openings in the system No Frost.
- 🧊 Ice chips on the fan blades create a characteristic crackling sound.
Sometimes extraneous sounds appear immediately after defrosting or loading a large amount of warm food.
In this case, the unit simply works in enhanced mode, and after a few hours the noise should subside.
If the sound is metallic and sharp, this may indicate friction of the internal parts of the compressor.
Problems with seals and tightness
The tightness of the chamber is the key to efficient operation of the refrigerator.
If the rubber seal on the door is worn out, dirty or deformed, warm air enters the chamber.
The compressor is forced to work without interruption, trying to compensate for heat loss, which leads to overload and increased energy consumption.
You can check the tightness of the seal with a simple test with a sheet of paper.
Clamp the sheet with the door around the perimeter: if it pulls out too easily or falls out, it means the tightness is broken.
Often the seal is simply contaminated with fat and crumbs, which is why it does not stick to metal.
Thorough washing with soapy water and wiping with silicone grease can restore the elasticity and stickiness of rubber.
If the seal is cracked or lost its shape, it must be replaced with a new one, selected according to the model.
When installing a new seal, it is often recommended to warm it up with a hairdryer so that it straightens out and falls into place.
Attention should also be paid to the door hinges.
Over time, they can sag, and the door warps, no longer closing tightly.
Hinge adjustment is usually carried out using a hexagon or wrench, and this procedure is described in the instructions for the specific models.
⚠️ Attention: Do not use aggressive chemicals, alcohols or abrasives to clean the seals, as they destroy the structure of the rubber, making it hard and brittle.
How to level out a dent on the seal?
If on the seal If a dent has formed, try heating the area with a hairdryer at medium power, and then straighten the rubber with your fingers. After cooling, it can restore its original shape.
Frequent questions and answers (FAQ)
Why does the LG refrigerator make the sound of a bursting bubble or pouring water?
This is an absolutely normal phenomenon for modern units.
Sounds occur due to the circulation of refrigerant (freon) in the system pipes.
When the compressor is turned off, the pressure in the system is equalized, which is accompanied by a characteristic gurgle.
What to do if the Er FF error lights up on the display?
Code Er FF indicates a malfunction of the freezer fan.
Most often it is blocked by ice or the electric motor has failed.
It is necessary to defrost the chamber and check the operation of the fan, replacing it if necessary.
Is it possible to transport an LG refrigerator lying down?
It is strictly not recommended to transport modern models lying down, especially on their side, where the compressor tubes are located.
Oil from the compressor can leak into the refrigerant circuit, which will lead to clogging of the capillary tube and expensive repairs.
Transportation is only possible in a vertical position.
How often do you need to defrost a refrigerator with a No Frost system?
Technically, the No Frost system does not require manual defrosting to remove ice.
However, at least once a year it is recommended to turn off the unit for hygienic cleaning, washing internal surfaces and drying.
This will help eliminate odors and prevent the growth of bacteria.
Why does the back wall inside the refrigerator compartment become covered with ice?
In drip systems (crying back) this is part of the operating cycle: moisture freezes, then thaws and flows into the drain.
If it forms a thick coat of ice that does not disappear, perhaps the door does not close or the thermostat is faulty.
In No Frost systems there should be no ice inside the chambers at all.