The situation when your LG refrigerator suddenly stops performing its functions, always catching you by surprise. Lack of cold can lead to spoilage of food, and constant noise or its complete absence raises concerns about the condition of expensive equipment. Most often, it is too early to panic: many problems can be solved by checking simple parameters or resetting the error.
In this article we will examine in detail the main reasons why the unit may not start or stop freezing. You will learn how to decipher the flashing indicators, in which cases you need to call a technician, and when simple adjustments are enough. Diagnostics begins with checking the power supply and operation of the compressor, since these are the nodes that are responsible for generating cold.
Before disassembling the equipment, you should make sure that the problem does not lie in trivial things like a broken cord or lack of voltage in socket. Modern models LG equipped with complex electronics that can block startup at the slightest voltage surge. Let's go through the steps to identify the malfunction one by one.
⚠️ Attention: Before starting any diagnostics or repairs, be sure to disconnect the device from the power supply. Working with live electrical components is life-threatening.
Primary diagnostics: why there is no response to switching on
If LG refrigerator does not show signs of life, first check the integrity of the network cable. Visually inspect the wire along its entire length: there are no kinks, traces of rodents or melts. Often the problem lies precisely in damage to the cable at the entrance to the case or plug.
Make sure there is voltage in the outlet. To do this, connect any other working device to it, for example, a lamp or hair dryer. If the socket is working properly, but the equipment is silent, the thermal protection relay may have tripped or the surge protector inside the control module has failed. In some models Linear Inverter the fuse may blow during a power surge.
It is also worth checking the tightness of the plug to the socket contacts. Poor contact causes sparking and heating, which can lead to burnt terminals. If you use an extension cord or surge protector, try connecting the unit directly to the wall, eliminating unnecessary chain links.
Problems with the compressor and cooling system
When you hear that compressor it is trying to start, makes a clicking or buzzing noise, but immediately goes silent, this indicates problems with the starting mechanism. In older models, the starting relay often fails and requires replacement. In modern inverter models LG the reason may be in the compressor itself or the control board.
If the motor runs continuously, but the temperature inside the chambers does not decrease, a refrigerant (freon) leak is likely. In this case, LG refrigerator works in vain, trying to compensate for the lack of gas. Signs of a leak can also be swelling on the back wall or oily spots in the compressor area.
Another common reason for the lack of cold is a clogged capillary tube or a malfunction of the thermostat. If the temperature sensor “thinks” that it’s already cold inside, it will not give the command to start the compressor. You can check this by temporarily closing the thermostat contacts (for mechanical models) or checking the sensor readings with a multimeter.
- 🔌 Start relay: Often burns out due to voltage surges, requires replacement with a similar one.
- ❄️ Freon leak: Requires searching for a leak, evacuating the system and refilling refrigerant.
- 🌡️ Thermostat/Sensor: Incorrect temperature readings block the start of the cooling system.
Is it possible to replace the compressor yourself?
Replacing the compressor - a complex process that requires special equipment for soldering copper tubes and evacuating the system. Without skills and tools, it is impossible to perform this work efficiently, so it is better to contact a service center.
Malfunctions of the No Frost and defrost system
In models with the system No Frost a frequent cause of cooling cessation is a malfunction of the defrost system. If the evaporator becomes overgrown with a “coat” of ice, the air channel is blocked and cold air stops flowing into the chamber. In this case, the compressor can work properly.
The main elements that fail in the defrost circuit: evaporator heating element, defrost sensor or timer (in mechanical models). If the heating element burns out, the ice does not melt, and after a while the fan begins to hum, touching the frozen ice with its blades. In electronics, this is often recorded as an error.
You can check the heating element with a multimeter for an open circuit. If the resistance is infinite, the heating element is faulty. It is also worth inspecting the drainage hole: if it is clogged with debris or ice, the water does not leave from melting, but freezes, forming an ice plug.
☑️ Diagnostics of the No Frost system
⚠️ Attention: When defrosting the No Frost system, do not use sharp objects for chipping ice. Damage to the evaporator tubes will lead to an immediate leak of freon and expensive repairs.
LG refrigerator error code table
Modern refrigerators LG are equipped with a self-diagnosis system. When a malfunction occurs, an error code appears on the display or certain indicators begin to flash. Deciphering these signals allows you to quickly identify the node that requires attention.
Below is a table of the most common error codes. Please note that combinations may differ depending on the series and year of manufacture of the model.
| Error code | Description of malfunction | Probable cause |
|---|---|---|
rF |
Freezer sensor error | Temperature sensor faulty or open circuit |
rS |
fridge compartment sensor error | Failure of the sensor or control board |
dS |
Defrost sensor error | Fault in the evaporator defrost circuit |
bF |
Fan error | Fan freezing or motor failure |
FF |
Board communication error | Problem with the connection between the main and display boards |
If a code appears on the screen, try resetting the error. To do this, unplug the refrigerator for 10–15 minutes and then turn it on again. If the error appeared once due to a power surge, it will disappear. If the code is constantly on, the unit requires repair.
Extraordinary sounds and vibration during operation
If LG refrigerator works, but makes unusual sounds, this is a signal of mechanical problems. Loud hums, knocking or rattling noises are not only annoying, but also indicate worn parts. Inverter compressors operate quieter than conventional ones, but if they malfunction, they can emit a high-frequency whistle.
The fan is often the source of noise. If ice freezes on its blades or a foreign object gets into it, a characteristic cracking sound occurs. Also, over time, the fan motor bearings wear out, resulting in a humming noise. In this case, the unit requires lubrication or replacement.
Vibration and rattling of the housing may be caused by improper installation. Check the adjusting feet: the refrigerator should be stable and not wobble. If the legs are not unscrewed correctly, vibration from the operating compressor is transmitted to the floor and walls, increasing the noise.
- 🔊 Gurgling: The normal sound of freon flowing through the pipes does not require intervention.
- 🔨 Knock: Often indicates that the compressor is touching the housing or pipes, or wear of internal valves.
- 🌪️ Whistling: Characteristic of problems with air circulation or a malfunction of the inverter motor.
When you need to call a professional technician
Despite the desire to save money, there are situations when do-it-yourself repair is impossible or dangerous. If the problem is related to a sealed circuit (freon leakage, replacement of a compressor, capillary tube), special equipment is required: a vacuum pump, a pressure gauge station and a burner.
Also, you should not get into electronic control boards yourself if you do not have experience working with microelectronics. Incorrect diagnostics can lead to the failure of an expensive module, the cost of which is a significant part of the price of a new refrigerator.
Call a specialist if:
- 🛠️ The compressor needs to be replaced or refilled with freon.
- 💻 A complex error appears on the display, which can be reset does not help.
- 🔥 There is a burning smell or the wires inside the unit have melted.
⚠️ Attention: Independent soldering of copper tubes without using nitrogen to purge the system will lead to the formation of oxides inside the circuit, which is guaranteed to cause the new compressor to fail in a short time.
Prevention and extension of service life
In order LG refrigerator to serve for a long time and not require frequent repairs, it is important to follow the operating rules. Regularly, at least once a year, defrost the unit (even the No Frost system) for complete cleaning and drying. This will prevent the formation of old ice jams.
Keep the condenser (grids at the back or bottom) clean. Dust and animal hair, accumulating on the tubes, impair heat transfer, causing the compressor to work with overload. Vacuuming the condenser is a good habit that will reduce energy consumption.
Do not load the chambers with food immediately after purchase. Let the refrigerator set to normal for several hours. Also, do not place hot dishes inside - this creates an extra load on the cooling system and provokes the formation of condensation.
How often should you clean the refrigerator?
It is recommended to carry out a complete cleaning by washing the shelves and wiping the inner walls every 3-4 months. This will prevent the appearance of unpleasant odors and the growth of bacteria.
Why does the LG refrigerator hum after defrosting?
If a strong hum appears after defrosting, you may have damaged the fan blades when removing ice or there is water left in the drainage system that has frozen and is interfering with operation. Also check whether the tubes have moved and are not touching the body.
Is it possible to operate the refrigerator if the error is on?
Short-term operation is possible if the refrigerator continues to freeze. However, ignoring the error can lead to aggravation of the breakdown. For example, a fan error will lead to freezing of the evaporator and stopping cooling after a few days.
How long should the refrigerator sit after transportation before turning it on?
If the refrigerator was transported in an upright position, 2-3 hours is enough. If it was lying on its side, you need to let the oil drain into the compressor for 8-12 hours (in winter it is better to increase the time to a day).
What to do if there is water on the floor in the LG refrigerator?
Most likely, the drainage hole is clogged. Clean it with a special stick or soft wire. Also check the integrity of the water collection tray above the compressor - it could have cracked over time.
Why does the light in the LG refrigerator not turn on?
Most often the lamp or LED backlight burns out. Less commonly, the problem is in the door switch (button), which does not open the circuit when the door is opened. Check the integrity of the lamp first.